JPH0631960A - Thermal head - Google Patents

Thermal head

Info

Publication number
JPH0631960A
JPH0631960A JP19197592A JP19197592A JPH0631960A JP H0631960 A JPH0631960 A JP H0631960A JP 19197592 A JP19197592 A JP 19197592A JP 19197592 A JP19197592 A JP 19197592A JP H0631960 A JPH0631960 A JP H0631960A
Authority
JP
Japan
Prior art keywords
signal line
drive signal
conductor
thick film
common
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
JP19197592A
Other languages
Japanese (ja)
Inventor
Kimiya Ichikawa
公也 市川
Masaru Yamagata
勝 山形
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.)
Oki Electric Industry Co Ltd
Original Assignee
Oki Electric Industry 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 Oki Electric Industry Co Ltd filed Critical Oki Electric Industry Co Ltd
Priority to JP19197592A priority Critical patent/JPH0631960A/en
Publication of JPH0631960A publication Critical patent/JPH0631960A/en
Pending legal-status Critical Current

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  • Electronic Switches (AREA)
  • Chemically Coating (AREA)

Abstract

PURPOSE:To obtain high print quality without increase of resistance value of a common conductor occurring due to elution of a thick conductor by making a plating layer of barrier metal on the surface of the common conductor made of the thick conductor to be commonly connected to end of heating resistor elements and making a common drive signal line, an individual drive signal line, and a control signal line of thin film. CONSTITUTION:In a thermal head, heating resistor elements 2 are formed in a row in left and right directions on the surface of a plate-like substrate 1 consisting of electrical insulating material such as ceramic and glass. A common conductor to be commonly connected to an end of the heating resistor element 2 is formed such that a thick film 31 is made of gold or silver on the surface of the substrate 1 and a plating layer is made of a barrier metal 32 such as nickel on the surface of the thick film 31. Further, an individual drive signal line to be connected to other end of the heating resistor element 2, a control signal line of a switching integrated circuit element to be connected to other end of the individual drive signal line and a common drive signal line are made of thin film. The surface of the thick film 31 is flattened by the plating layer of the barrier metal 32, so that pinholes of photoresist in post- process will be improved.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】この発明は、ワードプロセッサや
タイプライタのプリンタとして用いられ、或いはまたフ
ァクシミリ等において用いられるサーマルヘッドに関す
る。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thermal head used as a printer of a word processor or a typewriter, or used in a facsimile or the like.

【0002】[0002]

【従来の技術】従来のサーマルヘッドとしては、特開昭
60−116474号公報に開示されているようなもの
がある。従来のサーマルヘッドを図に基いて説明する。
図2は従来のサーマルヘッドの平面図であり、図3はそ
の等価回路図である。図において、1は電気絶縁材料例
えば、セラミックスやガラスなどから成る平板状の基板
であり、この基板1の表面上に多数の抵抗発熱体2が図
示するごとく、左右方向に一列状に形成されており、こ
の抵抗発熱体2の一方端の上端には、共通導体3が接続
されている。また抵抗発熱体2の他方端の下端には、相
互に間隔をあけて複数の個別駆動信号線A1 〜An が形
成され、この個別駆動信号線A1〜An には、集積回路
素子D1 〜Dn の複数の端子Da1〜Danが接続されてい
る。また集積回路素子D1 〜Dn には、複数の制御信号
線B1 〜Bn と、共通駆動信号線E1 〜En とが集積回
路素子D1 の符号Db1〜Dbnで示される複数の端子と、
端子De1〜Denにそれぞれ接続されている。集積回路素
子D1 は、制御信号線B1 を介して入力された制御信号
に応答し、共通駆動信号線E1 と個別駆動信号線A1 の
それぞれを選択的に導通される作用をなす。個別駆動信
号線A1 の各々は、抵抗発熱体2にそれぞれ個別的に接
続されている。なお、残余の集積回路素子D2 〜Dn に
ついても同様である。
2. Description of the Related Art As a conventional thermal head, there is a thermal head disclosed in JP-A-60-116474. A conventional thermal head will be described with reference to the drawings.
2 is a plan view of a conventional thermal head, and FIG. 3 is an equivalent circuit diagram thereof. In the figure, reference numeral 1 denotes a flat plate-shaped substrate made of an electrically insulating material such as ceramics or glass. A large number of resistance heating elements 2 are formed on the surface of the substrate 1 in a row in the left-right direction as shown in the drawing. The common conductor 3 is connected to the upper end of one end of the resistance heating element 2. A plurality of individual drive signal lines A1 to An are formed at the lower end of the other end of the resistance heating element 2 at intervals from each other. The individual drive signal lines A1 to An are connected to the integrated circuit elements D1 to Dn. A plurality of terminals Da1 to Dan are connected. Further, in the integrated circuit elements D1 to Dn, a plurality of control signal lines B1 to Bn and a plurality of common drive signal lines E1 to En are provided with a plurality of terminals indicated by symbols Db1 to Dbn of the integrated circuit element D1.
The terminals De1 to Den are respectively connected. The integrated circuit device D1 responds to a control signal input via the control signal line B1 and selectively conducts the common drive signal line E1 and the individual drive signal line A1. Each of the individual drive signal lines A1 is individually connected to the resistance heating element 2. The same applies to the remaining integrated circuit elements D2 to Dn.

【0003】以上の図2のサーマルヘッドにおいて、感
熱記録紙は抵抗発熱体2の延在方向(図の左右方向)に
垂直な方向(図の上下方向)に移動される。この移動に
伴い、各発熱ドットを構成する抵抗発熱体2に共通駆動
信号線E1 〜En ,個別駆動信号線A1 〜An および共
通導体3を介して電圧を印加し、各発熱ドットを選択的
に発熱させることにより感熱記録紙にドット印字が行わ
れる。
In the thermal head shown in FIG. 2, the thermal recording paper is moved in a direction perpendicular to the extending direction of the resistance heating element 2 (horizontal direction in the figure) (vertical direction in the figure). Along with this movement, a voltage is applied to the resistance heating element 2 forming each heating dot via the common driving signal lines E1 to En, the individual driving signal lines A1 to An and the common conductor 3 to selectively select each heating dot. By generating heat, dots are printed on the thermosensitive recording paper.

【0004】図4は、サーマルヘッドの集積回路素子D
1 付近の部分拡大図であり、図5は、図4の切断面線IV
−IVから見た断面図である。図5において31は厚膜で
ある。この様なサーマルヘッドを製造するに当たって
は、セラミック、ガラス等からなる電気絶縁基板1の表
面に先ず、金や銀・パラジウム等からなる共通導体3を
スクリ−ン印刷等の厚膜印刷技術によって、絶縁基板1
上に印刷して厚膜31を形成する。また、共通駆動信号
線Ex1と個別駆動信号線A101 〜A164 および制御信号
線B101 〜B105 は金やアルミニウム等から成っている
が、これは蒸着やスパッタリング等の薄膜手法を採用す
ることにより形成される。特開昭60−116474号
公報には、共通導体3および共通駆動信号線Ex1を厚膜
で、個別駆動信号線A101 〜A164 および制御信号線B
101 〜B105 を薄膜で形成した熱印刷装置が開示されて
いる。
FIG. 4 shows an integrated circuit element D of a thermal head.
FIG. 5 is a partially enlarged view of the vicinity of FIG. 1, and FIG.
FIG. 4 is a sectional view seen from IV. In FIG. 5, 31 is a thick film. In manufacturing such a thermal head, first, a common conductor 3 made of gold, silver, palladium or the like is formed on the surface of an electrically insulating substrate 1 made of ceramic, glass or the like by a thick film printing technique such as screen printing. Insulating substrate 1
The thick film 31 is formed by printing on the top. The common drive signal line Ex1, the individual drive signal lines A101 to A164, and the control signal lines B101 to B105 are made of gold, aluminum or the like, which is formed by adopting a thin film method such as vapor deposition or sputtering. . In JP-A-60-116474, the common conductor 3 and the common drive signal line Ex1 are thick films, and the individual drive signal lines A101 to A164 and the control signal line B are disclosed.
A thermal printing device in which 101 to B105 are formed of a thin film is disclosed.

【0005】[0005]

【発明が解決しようとする課題】上記に述べた従来のサ
ーマルヘッドは、その製造工程において以下に示すよう
な問題点があった。サーマルヘッドの共通導体3はスク
リーン印刷等の厚膜印刷技術によって印刷、焼成される
が、焼成後の厚膜31の表面の粗度は大きく、断面平均
粗さはRa〉0.5 μmと大きい。このため厚膜31の表
面の突起部分において、この上に形成する抵抗膜のスパ
ッタリング,パタンエッチング並びに導体のスパッタリ
ング,パタンエッチング及び保護膜のスパッタリング等
の各工程の薄膜材料にピンホールを生じさせることがあ
る。例えば、各駆動信号線を形成する金或いはアルミニ
ウム等の導体金属をスパッタリング等で形成した後、ホ
トリソグラフィ技術による各パターンの焼付け現像、不
要導体部のエッチングを行う。このとき厚膜31上のホ
トレジストにピンホールがあれば、そこからエッチング
液が侵入し導体にピンホ−ルを生じせしめるのみでな
く、エッチング液によっては厚膜導体の溶出を生ずる。
これによりエッチング液は汚濁し、その後のエッチング
性を劣化させ液寿命を極端に低下させる。さらに、厚膜
導体の溶出により、厚膜31の表面の粗度は従来以上の
凹凸を生じさせる。この凹凸は、次工程でのパターン形
成ホトリソグラフィ工程においてさらにピンホールを助
長する。
The conventional thermal head described above has the following problems in its manufacturing process. The common conductor 3 of the thermal head is printed and baked by a thick film printing technique such as screen printing, but the surface roughness of the thick film 31 after baking is large and the average cross-section roughness is Ra> 0.5 μm. For this reason, in the protruding portion on the surface of the thick film 31, it is necessary to generate pinholes in the thin film material in each process such as sputtering of the resistance film formed on this, pattern etching and conductor sputtering, pattern etching and sputtering of the protective film. There is. For example, a conductive metal such as gold or aluminum forming each drive signal line is formed by sputtering or the like, and then each pattern is baked and developed by a photolithography technique, and unnecessary conductor portions are etched. At this time, if there is a pinhole in the photoresist on the thick film 31, not only the etching solution enters from there to cause a pinhole in the conductor, but also the thick film conductor is eluted depending on the etching solution.
As a result, the etching solution becomes dirty, and the subsequent etching property is deteriorated, and the life of the solution is extremely shortened. Furthermore, the elution of the thick film conductor causes the roughness of the surface of the thick film 31 to be more uneven than before. The irregularities further promote pinholes in the patterning photolithography process in the next process.

【0006】また、この厚膜31の表面の凹凸により、
この上に形成する抵抗発熱体2の保護膜にもピンホール
を生じさせる。この保護膜ピンホールからは、空気中の
水分および感熱記録紙中に含まれるCl,Na等の
イオンが侵入し導体金属を腐蝕し、サーマルヘッドとし
ての機能を損なう問題があった。また、厚膜31上の凹
凸特にエッチング時に生じた厚膜ピンホールは、そのピ
ンホールエッヂがもり上がり易く、サーマルヘッドとし
て印字動作を行った場合、感熱紙等の記録媒体がこの突
起にこすられ記録紙等にキズとして残り、印字品質を劣
化させる問題があった。また、厚膜材料として比較的安
価で導体抵抗の低い銀を用いると、Agマイグレーショ
ンを生じさせ、場合によっては、この上に形成した導体
金属および保護膜材料等との接着性を失わせる等の問題
があった。また、厚膜の溶出により共通導体の抵抗値を
上昇せしめ、大電流が流れた場合等の電圧降下を生じさ
せ、発熱体の発熱温度が低下し、印字品質の劣化を生ぜ
しめる問題があった。
Further, due to the unevenness of the surface of the thick film 31,
Pinholes are also formed in the protective film of the resistance heating element 2 formed thereon. From the protective film pinhole, there is a problem that moisture in the air and ions such as Cl and Na + contained in the thermal recording paper invade to corrode the conductor metal and impair the function of the thermal head. Further, the irregularities on the thick film 31, especially the thick film pinholes generated during etching, easily raises the pinhole edge, and when a printing operation is performed as a thermal head, a recording medium such as a thermal paper is rubbed against the protrusions. There is a problem that it remains as a scratch on the recording paper and deteriorates the printing quality. In addition, when silver, which is relatively inexpensive and has low conductor resistance, is used as the thick film material, Ag migration is caused, and in some cases, adhesion with the conductor metal and the protective film material formed thereon is lost. There was a problem. Further, there is a problem that the resistance value of the common conductor is increased by elution of the thick film, a voltage drop occurs when a large current flows, the heat generation temperature of the heating element is lowered, and the print quality is deteriorated. .

【0007】本発明は、以上のサーマルヘッドの問題点
を解消するために、厚膜共通導体をニッケル等のバリア
金属でメッキを施し、薄膜プロセス工程における (1)エッチング液の汚濁防止および長寿命化 (2)金、アルミニゥム等の薄膜パターンの抵抗値上昇と
バラツキの抑制 (3)厚膜導体の溶出の防止 (4)記録紙のキズの防止 (5)Agマイグレーションの防止 等を図るためのサーマルヘッドを提供することを目的と
する。
In order to solve the above problems of the thermal head, the present invention plated a thick film common conductor with a barrier metal such as nickel, and (1) prevents contamination of the etching solution and has a long life in the thin film process step. (2) Inhibition of resistance increase and variation of thin film pattern such as gold and aluminum (3) Prevention of elution of thick film conductor (4) Prevention of scratch on recording paper (5) Prevention of Ag migration The purpose is to provide a thermal head.

【0008】[0008]

【課題を解決するための手段】本発明は、電気絶縁性基
板の表面に抵抗発熱体と、その抵抗発熱体の一端に共通
に接続される厚膜導体で形成された共通導体と、抵抗発
熱体の他端に接続される個別駆動信号線と、その個別駆
動信号線の他端に接続されるスイッチング集積回路素子
とこれに接続される制御信号線および共通駆動信号線を
取付けてなるサーマルヘッドにおいて、前記厚膜導体で
形成された共通導体の表面にバリア金属のメッキ層を形
成し、かつ共通駆動信号線と個別駆動信号線および制御
信号線を薄膜で形成するサーマルヘッドである。さら
に、バリア金属のメッキ層をNi−P,Ni−Bのメッ
キ浴にて無電解メッキにて形成することを特徴とするも
のである。
According to the present invention, a resistance heating element is formed on a surface of an electrically insulating substrate, a common conductor formed of a thick film conductor commonly connected to one end of the resistance heating element, and a resistance heating element. A thermal head including an individual drive signal line connected to the other end of the body, a switching integrated circuit element connected to the other end of the individual drive signal line, and a control signal line and a common drive signal line connected to the switching integrated circuit device. 2 is a thermal head in which a plating layer of a barrier metal is formed on the surface of the common conductor formed of the thick film conductor, and the common drive signal line, the individual drive signal line and the control signal line are formed of a thin film. Further, the present invention is characterized in that the barrier metal plating layer is formed by electroless plating in a Ni-P or Ni-B plating bath.

【0009】[0009]

【作用】本発明のサーマルヘッドは、厚膜共通導体にメ
ッキを施したので、平坦化されるため、厚膜導体の上に
薄膜材料を形成したときでもピンホールを生じることは
なく、さらに、ホトレジストにピンホールが生じた場合
でも厚膜導体にはバリア金属によるメッキが施されてい
るので、厚膜導体の溶出はなく、エッチング液の汚濁を
減少させ、その後のエッチング性の劣化を遅らせる。な
お、本発明のバリア金属(Diffusion barrier metal )
は耐食性及び耐薬品性に優れなおかつAgの拡散防止の
作用を成すものである。また、この上に形成する抵抗発
熱体保護膜の表面も滑らかになり、導体金属と外気との
接触を遮断し胴体金属の腐蝕を防止する。さらに、サー
マルヘッドとして印字動作を行った場合でも厚膜上の凹
凸による影響もなく印字品質の劣化を防止する。また、
厚膜材料として銀を用いた場合でも、バリア金属が形成
されているため、マイグレ−ションが生じることはな
く、この上に形成した導体金属および保護膜材料等の接
着性は向上する。また、厚膜導体の溶出による共通導体
の抵抗値の上昇はなく電圧降下も生じないため、印字品
質の高いサーマルヘッドが得られる。
In the thermal head of the present invention, since the thick film common conductor is plated, the thermal head is flattened. Therefore, even when a thin film material is formed on the thick film conductor, pinholes do not occur. Even if the photoresist has pinholes, since the thick film conductor is plated with the barrier metal, the thick film conductor does not elute, the contamination of the etching solution is reduced, and the subsequent deterioration of the etching property is delayed. In addition, the barrier metal of the present invention (Diffusion barrier metal)
Has excellent corrosion resistance and chemical resistance, and also acts to prevent Ag diffusion. In addition, the surface of the resistance heating element protective film formed thereon is also smoothed to block the contact between the conductor metal and the outside air and prevent the body metal from being corroded. Further, even when the printing operation is performed as the thermal head, deterioration of the printing quality is prevented without being affected by the unevenness on the thick film. Also,
Even when silver is used as the thick film material, since the barrier metal is formed, migration does not occur, and the adhesion of the conductor metal and the protective film material formed thereon is improved. Further, since the resistance value of the common conductor does not increase and the voltage drop does not occur due to the elution of the thick film conductor, a thermal head with high printing quality can be obtained.

【0010】[0010]

【実施例】図1は、本実施態様例である図4の切断面線
IV−IVからみた本発明の断面図である。図において、1
はセラミックスやガラスなどの電気絶縁材料から成る平
板状の基板であり、2は基板1の表面上に左右方向に一
列状に形成されている抵抗発熱体、31は厚膜、32は
バリア金属、本実施例ではニッケルNiを示す。
EXAMPLE FIG. 1 is a sectional view of FIG. 4 showing an example of this embodiment.
It is sectional drawing of this invention seen from IV-IV. In the figure, 1
Is a flat plate-like substrate made of an electrically insulating material such as ceramics or glass, 2 is a resistance heating element formed on the surface of the substrate 1 in a row in the left-right direction, 31 is a thick film, 32 is a barrier metal, In this embodiment, nickel Ni is shown.

【0011】本発明のサーマルヘッドは、まず、セラミ
ックスやガラスなどの電気絶縁材料から成る平板状の基
板1の表面に、金や銀等で厚膜31を形成する。次に形
成された厚膜導体31の表面にニッケル等のバリア金属
32によりメッキ層を形成し共通導体3を形成する。バ
リア金属32のメッキ層により厚膜31の表面が平坦化
され、後工程のホトレジスト等のピンホールが改善され
るとともに、薄膜工程におけるエッチングにエッチング
液を汚濁することもない。
In the thermal head of the present invention, first, a thick film 31 is formed of gold, silver or the like on the surface of a flat plate-shaped substrate 1 made of an electrically insulating material such as ceramics or glass. Next, the common conductor 3 is formed by forming a plating layer on the surface of the formed thick film conductor 31 with a barrier metal 32 such as nickel. The surface of the thick film 31 is flattened by the plating layer of the barrier metal 32, pinholes such as photoresist in the subsequent step are improved, and the etching solution is not polluted during etching in the thin film step.

【0012】本実施例では、基板1の表面の厚膜導体3
1としてはAgペーストを用い、これを200メッシュ
程度のスクリーン印刷版により、30μm厚み程度に印
刷する。しかる後、最高600℃程度で焼成することに
より、厚膜導体31を形成する。この後、バリア金属の
形成を行う。形成方法としては、厚膜31上に選択的に
形成でき、素地表面の凹凸に対し完全に覆う効果のある
無電解メッキが好適である。また、耐食性バリア金属と
しては、Ni,Co,Cu等があり特に、ニッケルをN
i−P,Ni−B等のメッキ浴で無電解メッキにて形成
することが知られており、本実施例では、Ni−P
(P:8〜10重量%)の無電解メッキを用いた。以
下、メッキ工程について説明する。
In this embodiment, the thick film conductor 3 on the surface of the substrate 1 is used.
As No. 1, Ag paste is used, and this is printed with a screen printing plate of about 200 mesh to a thickness of about 30 μm. Thereafter, the thick film conductor 31 is formed by firing at a maximum of about 600 ° C. After that, the barrier metal is formed. As a forming method, electroless plating that can be selectively formed on the thick film 31 and has an effect of completely covering irregularities on the surface of the base material is preferable. Further, as the corrosion-resistant barrier metal, there are Ni, Co, Cu and the like.
It is known to form by electroless plating in a plating bath such as i-P or Ni-B. In this embodiment, Ni-P is used.
(P: 8 to 10% by weight) electroless plating was used. The plating process will be described below.

【0013】先ず、10%塩酸により、Ag厚膜を形成
したセラミック基板1を酸洗浄し、Ag表面の酸化膜を
取り除く。水洗後、PdCl溶液によりAg表面の活性
化を助長する。しかる後、次に示すNi−P浴メッキ液
組成にて60〜65℃の液温にて無電解メッキを行う。
First, the ceramic substrate 1 on which the Ag thick film is formed is acid-cleaned with 10% hydrochloric acid to remove the oxide film on the Ag surface. After washing with water, activation of the Ag surface is promoted by the PdCl solution. After that, electroless plating is performed with the following Ni-P bath plating solution composition at a solution temperature of 60 to 65 ° C.

【0014】 Ni−Pメッキ液組成(g/l) Ni塩 硫酸ニッケル NiSO4 ・6H2 O 25g/l 還元剤 次亜リン酸ナトリウム NaH2 PO4 ・H2 O 20g/l 錯化剤 クエン酸ナトリウム C4 5 7 Na3 ・2H2 O 10g/l 促進剤 酢酸ナトリウム NaCH3 COO・3H2 O 10g/l PH 5.0[0014] Ni-P plating solution composition (g / l) Ni salt nickel sulfate NiSO 4 · 6H 2 O 25g / l reducing agent sodium hypophosphite NaH 2 PO 4 · H 2 O 20g / l complexing agent citric acid sodium C 4 H 5 O 7 Na 3 · 2H 2 O 10g / l promoter sodium acetate NaCH 3 COO · 3H 2 O 10g / l PH 5.0

【0015】約10分程度で5μm厚のNi−Pメッキ
被膜がAg厚膜上のみに形成される。なお、Ni−Pメ
ッキ表面の不導体化を防ぐため、この後置換Auメッキ
(液温90℃,20分間)を行い、0.2μm程度のA
uメッキを形成してもよい。
In about 10 minutes, a Ni-P plated film having a thickness of 5 μm is formed only on the Ag thick film. In order to prevent the Ni-P plating surface from becoming a non-conductor, substitutional Au plating (liquid temperature 90 ° C., 20 minutes) was performed thereafter, and A of about 0.2 μm was formed.
U plating may be formed.

【0016】本実施例では、耐食性バリア金属としてニ
ッケルをNi−Pのメッキ浴を用いて形成したが、その
メッキ浴の液組成は、本実施例に限定されず、以下のよ
うなものも使用することが出来る。Ni塩としては塩化
ニッケルや酢酸ニッケルもNiイオンの供給源として用
いられる。又、還元剤としては、次亜リン酸カリウムも
用いられ、さらに錯化剤としては、クエン酸ナトリウム
の他に乳酸,リンゴ酸,グリコール酸,酒石酸,グルコ
ン酸等のオキシカルボン酸塩,グリシン,アラニン等の
アミノカルボン酸が又促進剤としては酢酸,ぎ酸,プロ
ピオン酸,マロン酸,コハク酸,アジピン酸等のカルボ
ン酸やジカルボン酸並びにその塩類が使用され、さらに
チオ尿素やその誘導体である硫黄化合物や鉛等の重金属
塩類が安定剤として使用すると好ましい。
In the present embodiment, nickel was used as the corrosion-resistant barrier metal in a Ni-P plating bath, but the liquid composition of the plating bath is not limited to that of this embodiment, and the following ones are also used. You can do it. As the Ni salt, nickel chloride or nickel acetate is also used as a supply source of Ni ions. Further, potassium hypophosphite is also used as a reducing agent, and as the complexing agent, in addition to sodium citrate, oxycarboxylic acid salts such as lactic acid, malic acid, glycolic acid, tartaric acid and gluconic acid, glycine, Aminocarboxylic acids such as alanine are also used as promoters such as carboxylic acids such as acetic acid, formic acid, propionic acid, malonic acid, succinic acid and adipic acid, dicarboxylic acids and salts thereof, and thiourea and its derivatives. Heavy compounds such as sulfur compounds and lead are preferably used as stabilizers.

【0017】[0017]

【発明の効果】以上詳細に説明した通り、本発明のサー
マルヘッドによれば、次のような効果を奏するものであ
る。 (1)厚膜共通導体にメッキを施したので、従来の厚膜印
刷技術を用いた場合でも表面が平坦化されるので、厚膜
導体の上に薄膜材料を形成したときでもピンホールを生
じることはない。 (2)ホトレジストにピンホールが生じた場合でも厚膜導
体にはバリア金属によるメッキが施されているので、厚
膜導体の溶出はなく、エッチング液の汚濁を減少させ、
その後のエッチング性の劣化を遅らせる。 (3)厚膜導体のの上に形成する発熱体保護膜の表面も滑
らかになり、導体金属と外気との接触を遮断し導体金属
の腐蝕を防止する。 (4)サーマルヘッドとして印字動作を行った場合でも厚
膜上の凹凸による影響もなく印字品質の劣化を防止す
る。 (5)厚膜材料として銀を用いた場合でも、バリア金属が
形成されているため、マイグレーションが生じることは
なく、この上に形成した導体金属および保護膜材料等の
接着性は向上する。 (6)厚膜導体の溶出による共通導体の抵抗値の上昇はな
く電圧降下も生じないため、印字品質の高いサーマルヘ
ッドが得られる。
As described in detail above, the thermal head of the present invention has the following effects. (1) Since the thick-film common conductor is plated, the surface is flattened even when the conventional thick-film printing technology is used, so pinholes are generated even when a thin-film material is formed on the thick-film conductor. There is no such thing. (2) Even if the photoresist has pinholes, since the thick film conductor is plated with the barrier metal, there is no elution of the thick film conductor and the contamination of the etching solution is reduced.
The deterioration of the etching property after that is delayed. (3) The surface of the heating element protective film formed on the thick film conductor is also smoothed to block the contact between the conductor metal and the outside air and prevent corrosion of the conductor metal. (4) Even when the printing operation is performed as the thermal head, deterioration of the printing quality is prevented without being affected by the unevenness on the thick film. (5) Even when silver is used as the thick film material, since the barrier metal is formed, migration does not occur, and the adhesion of the conductor metal and the protective film material formed thereon is improved. (6) Since the resistance value of the common conductor does not increase due to the elution of the thick film conductor and no voltage drop occurs, a thermal head with high print quality can be obtained.

【図面の簡単な説明】[Brief description of drawings]

【図1】本発明の実施態様例であるサーマルヘッドの部
分断面図である。
FIG. 1 is a partial cross-sectional view of a thermal head according to an embodiment of the present invention.

【図2】従来のサーマルヘッドの平面図である。FIG. 2 is a plan view of a conventional thermal head.

【図3】図2の等価回路図である。FIG. 3 is an equivalent circuit diagram of FIG.

【図4】従来のサーマルヘッドの集積回路素子付近の部
分拡大図である。
FIG. 4 is a partially enlarged view of the vicinity of an integrated circuit element of a conventional thermal head.

【図5】従来のサーマルヘッドの部分断面図である。FIG. 5 is a partial cross-sectional view of a conventional thermal head.

【符号の説明】[Explanation of symbols]

1 基板 2 抵抗発熱体 3 共通導体 31 厚膜 32 バリア金属 A1 〜An 個別駆動信号線 B1 〜Bn 制御信号線 D1 〜Dn 集積回路素子 Da1〜Dan 端子 Db1〜Dbn 端子 E1 〜En 共通駆動信号線 Ex1 共通駆動信号線 A101 〜A164 個別駆動信号線 B101 〜B164 制御信号線 1 substrate 2 resistance heating element 3 common conductor 31 thick film 32 barrier metal A1 to An individual drive signal lines B1 to Bn control signal lines D1 to Dn integrated circuit elements Da1 to Dan terminals Db1 to Dbn terminals E1 to En common drive signal lines Ex1 Common drive signal line A101 to A164 Individual drive signal line B101 to B164 Control signal line

Claims (2)

【特許請求の範囲】[Claims] 【請求項1】 電気絶縁性基板の表面に抵抗発熱体と、
該抵抗発熱体の一端に共通に接続される厚膜導体で形成
された共通導体と、抵抗発熱体の他端に接続される個別
駆動信号線と、該個別駆動信号線の他端に接続されるス
イッチング集積回路素子と該集積回路素子に接続される
制御信号線および共通駆動信号線を取付けてなるサーマ
ルヘッドにおいて、前記厚膜導体で形成された共通導体
の表面にバリア金属によるメッキ層を形成し、かつ共通
駆動信号線と個別駆動信号線および制御信号線を薄膜で
形成したことを特徴とするサーマルヘッド。
1. A resistance heating element on the surface of an electrically insulating substrate,
A common conductor formed of a thick film conductor commonly connected to one end of the resistance heating element, an individual drive signal line connected to the other end of the resistance heating element, and connected to the other end of the individual drive signal line. In a thermal head having a switching integrated circuit element, a control signal line connected to the integrated circuit element, and a common drive signal line, a plating layer made of a barrier metal is formed on the surface of the common conductor formed of the thick film conductor. In addition, the common drive signal line, the individual drive signal line, and the control signal line are formed of a thin film.
【請求項2】 前記バリア金属によるメッキ層をNi−
P,Ni−Bのメッキ浴にて無電解メッキ法にて形成す
ることを特徴とする請求項1記載のサーマルヘッド。
2. The plating layer of the barrier metal is Ni--
The thermal head according to claim 1, which is formed by an electroless plating method using a P, Ni-B plating bath.
JP19197592A 1992-07-20 1992-07-20 Thermal head Pending JPH0631960A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP19197592A JPH0631960A (en) 1992-07-20 1992-07-20 Thermal head

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP19197592A JPH0631960A (en) 1992-07-20 1992-07-20 Thermal head

Publications (1)

Publication Number Publication Date
JPH0631960A true JPH0631960A (en) 1994-02-08

Family

ID=16283555

Family Applications (1)

Application Number Title Priority Date Filing Date
JP19197592A Pending JPH0631960A (en) 1992-07-20 1992-07-20 Thermal head

Country Status (1)

Country Link
JP (1) JPH0631960A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4826234A (en) * 1986-09-26 1989-05-02 Mazda Motor Corporation Steering assembly supporting structure of a motor vehicle

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4826234A (en) * 1986-09-26 1989-05-02 Mazda Motor Corporation Steering assembly supporting structure of a motor vehicle

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