JPH03199055A - Thermal head and manufacture thereof - Google Patents
Thermal head and manufacture thereofInfo
- Publication number
- JPH03199055A JPH03199055A JP34071789A JP34071789A JPH03199055A JP H03199055 A JPH03199055 A JP H03199055A JP 34071789 A JP34071789 A JP 34071789A JP 34071789 A JP34071789 A JP 34071789A JP H03199055 A JPH03199055 A JP H03199055A
- Authority
- JP
- Japan
- Prior art keywords
- substrate
- thermal head
- glass
- glaze
- glass glaze
- 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
- 238000004519 manufacturing process Methods 0.000 title claims description 9
- 239000011521 glass Substances 0.000 claims abstract description 29
- 239000000758 substrate Substances 0.000 claims abstract description 27
- 238000000034 method Methods 0.000 claims abstract description 6
- 239000010408 film Substances 0.000 abstract description 11
- 230000020169 heat generation Effects 0.000 abstract description 8
- 239000011241 protective layer Substances 0.000 abstract description 3
- 238000000059 patterning Methods 0.000 abstract description 2
- 238000000206 photolithography Methods 0.000 abstract description 2
- 239000010409 thin film Substances 0.000 abstract description 2
- 238000007493 shaping process Methods 0.000 abstract 1
- 238000007639 printing Methods 0.000 description 10
- 230000007423 decrease Effects 0.000 description 4
- 230000007547 defect Effects 0.000 description 4
- 238000011156 evaluation Methods 0.000 description 4
- 238000007796 conventional method Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 238000010835 comparative analysis Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000007650 screen-printing Methods 0.000 description 1
- 238000010186 staining Methods 0.000 description 1
Landscapes
- 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、プリンタ、ファクシミリ、ビデオプリンタ等
に使用されるサーマルヘッドに関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a thermal head used in printers, facsimiles, video printers, and the like.
［従来の技術］
（１）従来は例えば、第３図に示すように、基板１上に
ガラスグレーズ２が形成され、該ガラスグレーズの縁に
近づけるように発熱部３を形成したサーマルヘッドが知
られていた。 （以下Ｃタイプ）また、第４図に示すよ
うに、基板１の一端に傾斜面４を設け、該傾斜面近傍に
導電性膜５を形成し、更に導電性膜上にガラスグレーズ
２を形成したサーマルヘッドが知られていた。 （以下
ｄタイプ）（２）従来の端面型サーマルヘッドは、第７
図に示すように、基板１の一端面にガラスグレーズ２を
形成し、該ガラスグレーズ２上に発熱部３を形成し、分
割する製造方法が知られていた。[Prior Art] (1) Conventionally, for example, as shown in FIG. 3, a thermal head is known in which a glass glaze 2 is formed on a substrate 1 and a heat generating part 3 is formed close to the edge of the glass glaze. It was getting worse. (hereinafter referred to as C type) Also, as shown in FIG. 4, an inclined surface 4 is provided at one end of the substrate 1, a conductive film 5 is formed near the inclined surface, and a glass glaze 2 is further formed on the conductive film. Thermal heads were known. (hereinafter referred to as d type) (2) The conventional end face type thermal head has a 7th
As shown in the figure, a manufacturing method has been known in which a glass glaze 2 is formed on one end surface of a substrate 1, a heat generating part 3 is formed on the glass glaze 2, and the substrate is divided.
［発明が解決しようとする課題］
（１）しかし、Ｃタイプのような構成のサーマルヘッド
では、最近の高画質化に対応したヘッドの押しつけ圧力
の集中に対応ができなくなってきた。[Problems to be Solved by the Invention] (1) However, thermal heads with a configuration like the C type are no longer able to cope with the concentration of pressing pressure of the head that corresponds to the recent trend toward higher image quality.
即ち、基板上に形成されるガラスグレーズ上に発熱部を
形成する場合、押しつけ圧力の分散を防ぐために、発熱
部を、より曲率半径の小さいガラスグレーズの縁近傍に
形成するようになった。しかし、この方法によると、適
正位置で印画を行うためにヘッドの印画角度を増加させ
なければならず、この印画角度の増加によって基板端が
インクフィルムや紙に接触し、印画圧力は、逆に分散し
てしまったり、或いは、接触によるすじ汚れが問題とな
ってきた。また、ｄタイプのような構成のサーマルヘッ
ドでは、よりグレーズの縁近傍に発熱部を形成すること
が可能になったが、まだ十分小さなな曲率半径ではなか
った。更にガラスグレーズの焼成時のグレーズの溶融粘
度のばらつきによって、グレーズ縁の曲率半径がばらつ
いてしまうという課題があった。That is, when forming a heat generating part on a glass glaze formed on a substrate, the heat generating part is now formed near the edge of the glass glaze, which has a smaller radius of curvature, in order to prevent dispersion of pressing pressure. However, according to this method, the printing angle of the head must be increased in order to print at the correct position, and this increase in printing angle causes the edge of the substrate to come into contact with the ink film or paper, and the printing pressure is conversely dispersed. This has become a problem due to staining or streaks caused by contact. Further, in a thermal head having a structure like the d type, it has become possible to form a heat generating part closer to the edge of the glaze, but the radius of curvature is still not small enough. Furthermore, there is a problem in that the radius of curvature of the edge of the glaze varies due to variations in the melt viscosity of the glass glaze during firing.
（２）また、基板端面にガラスグレーズを形成し、サー
マルヘッドを製造する方法では、シリアルタイプでは一
基板に最大２列、ラインタイプでは２チツプのサーマル
ヘッドしか得ることができず、コスト高の原因になって
いた。(2) In addition, with the method of manufacturing thermal heads by forming a glass glaze on the edge of the substrate, it is possible to obtain thermal heads with a maximum of two rows on one substrate in the serial type, and only two chips in the line type, resulting in high costs. It was the cause.
本発明によるサーマルヘッドは、より曲率半径の小さな
ガラスグレーズ部を安定して形成し、印画圧力を集中さ
せることにより、印画品質の良好なサーマルヘッドをよ
り安価に提供することを目的としている。The thermal head according to the present invention aims to provide a thermal head with good printing quality at a lower cost by stably forming a glass glaze portion with a smaller radius of curvature and concentrating printing pressure.
［課題を解決するための手段］
そこで、本発明のサーマルヘッドは、第１図に示すよう
に（以下ａタイプ）、基板１の一端に傾斜部４を設け、
該傾斜面４と基板面の境界上にガラスグレーズ２が形成
され、更に前記境界部６近傍、望ましくは該境界部６に
かかるように発熱部３が形成されていることを特徴とす
る。また、大５図に示すように、基板１に溝加工部１１
を施し、該溝加工部１１を介して対向するようにガラス
グレーズ２及び発熱部３を形成することを特徴とする。[Means for Solving the Problems] Therefore, the thermal head of the present invention, as shown in FIG.
A glass glaze 2 is formed on the boundary between the inclined surface 4 and the substrate surface, and a heat generating part 3 is formed near the boundary 6, preferably over the boundary 6. In addition, as shown in Figure 5, a grooved portion 11 is provided on the substrate 1.
The glass glaze 2 and the heat generating part 3 are formed so as to face each other with the grooved part 11 interposed therebetween.
［実施例］
本発明による実施例を図面に基づいて説明するが、サー
マルヘッドはシリアルタイプ、ラインタイプを問わず、
適用が可能である。また、第２図に示すように、本発明
のサーマルヘッドに於いて、ガラスグレーズ２の下、或
いは近傍に導電性膜５を形成することが可能であり、共
通電極９側の抵抗値を低下させるためには、より望まし
い。[Example] An example according to the present invention will be described based on the drawings, but the thermal head can be used regardless of whether it is a serial type or a line type.
Applicable. Furthermore, as shown in FIG. 2, in the thermal head of the present invention, it is possible to form a conductive film 5 under or near the glass glaze 2, thereby reducing the resistance value on the common electrode 9 side. It is more desirable to
（１）ｃ、ｄ各タイプのサンプルはできる限り発熱部を
ガラスグレーズ２の縁、即ちガラスグレーズ２の曲率半
径の最小部に形成した物と、第１図に示すような、基板
の一端に傾斜部を設け、境界部６上に発熱部を形成した
物、更に第２図に示すような、ガラスグレーズの下に厚
膜印刷による導電性膜５を形成し、境界部６上に発熱部
３を形成したヘッドについて、
（Ｉ）印画評価
（ＩＩ）１ドツト通電時の発熱ピーク温度に対する全ド
ツト通電時の発熱ピーク温度の低下率について評価を行
った。 （Ｉ）の印画評価は、般にラフ紙と呼ばれる紙
を使用し、印画欠損の数を調べ 比較評価を行った。ま
た、 （ＩＩ）の発熱温度ピークの低下率について説明
すると、サーマルヘッドでは、各発熱部に接続されてい
るそれぞれの電極（セグメント電極）とすべての発熱部
に共通に接続されている電極（コモン電極）があり、待
機状態（非印字状態）ではこのセグメント電極とコモン
電極は同電位（Ｈｌｇｈ）に保たれている。印字時には
セグメント側が接地され、 コモン電極から発熱部を経
てセグメント側へと電流が流れる。今例えば、１ドツト
（抵抗値Ｒ）に通電させ、必要なピーク温度を得るため
のエネルギーがε（ｍｊ）であった時に、その時のパル
ス幅をｔ、通電ドツト数をｎとすると、コモン電極を流
れる総電流値１は、
ｉ ＝ｎＪ （ε／（Ｒｔ））
で表される。コモン電極の抵抗値をＲｃとすると、コモ
ン電極での電圧降下ΔＶは、
ΔＶ＝ｎ １Ｒｃ＝ｎＲｃＪ（Ｅ／ （Ｒｔ））で表さ
れる。従って、より多くのドツトに通電すると、電圧降
下は通電するドツト数に比例して増加するため、実際に
発熱部にかかる電圧が減少し、１ドツト通電時の発熱温
度と、多ドツト通電時の発熱温度に差が生じ、ることに
なる。(1) For samples of types c and d, the heat generating part should be formed as much as possible at the edge of the glass glaze 2, that is, at the smallest radius of curvature of the glass glaze 2, and at one end of the substrate as shown in Figure 1. In addition, as shown in FIG. 2, a conductive film 5 is formed by thick film printing under the glass glaze, and a heat generating part is formed on the boundary part 6. (I) Printing evaluation (II) For the heads formed with No. 3, the rate of decrease in the peak temperature of heat generation when energizing all dots relative to the peak temperature of heat generation when energizing one dot was evaluated. For the print evaluation (I), paper generally called rough paper was used, the number of defects in the print was checked, and a comparative evaluation was performed. In addition, to explain (II) the rate of decrease in the heat generation temperature peak, in a thermal head, each electrode (segment electrode) connected to each heat generation part and the electrode (common In the standby state (non-printing state), the segment electrode and the common electrode are kept at the same potential (HLgh). During printing, the segment side is grounded, and current flows from the common electrode through the heat generating part to the segment side. For example, if the energy required to energize one dot (resistance value R) and obtain the required peak temperature is ε (mj), the pulse width at that time is t, and the number of energized dots is n, then the common electrode The total current value 1 flowing through is expressed as i = nJ (ε/(Rt)). When the resistance value of the common electrode is Rc, the voltage drop ΔV at the common electrode is expressed as ΔV=n 1Rc=nRcJ(E/(Rt)). Therefore, when more dots are energized, the voltage drop increases in proportion to the number of energized dots, so the voltage actually applied to the heat generating part decreases, and the heat generation temperature when one dot is energized is different from that when multiple dots are energized. There will be a difference in the heat generation temperature.
（Ｉ）及び（ＩＩ ）についての評価結果を表１に示す
。ただし、表中のＱ−ｘは良〜劣への変化を表す。Table 1 shows the evaluation results for (I) and (II). However, Q-x in the table represents a change from good to poor.
表１
印画評価ではＣタイプが印画欠損がもつとも多く、ｄタ
イプでは印画欠損はかなり少なくなっている。ａ、
ｂタイプではほとんど印画欠損はなくなっていた。温度
低下率で、Ｃタイプに比べてａタイプの評価が良くなっ
ているのは、コモン電極が傾斜面上にも形成されている
ため、コモン電極面積が増加しているためである。Table 1 In the print evaluation, the C type had more print defects, while the D type had considerably fewer print defects. a,
In type b, there were almost no printing defects. The reason why type A is evaluated better than type C in terms of temperature reduction rate is because the common electrode is also formed on the inclined surface, so the area of the common electrode is increased.
（２）本発明のサーマルヘッドの製造方法を図面に基づ
いて説明するが、基板材料としてはアルミナ、ガラス、
絶縁加工を施した金属等、種々の物が使用できる。第５
図に於いて、基板１に溝加工１１を施した後、スクリー
ン印刷により、溝加工部１１の境界部６上に前記溝加工
部１１を介して対向するようにガラスペーストを印刷し
、焼成を行い、ガラスグレーズ２が形成されたサーマル
ヘッド用の基板を得る。また、第６図のごとく、溝加工
部１１に対向せずに、片側にのみガラスグレーズ２を形
成することも可能であるが、対向させて形成することに
より、工程が簡略になり、コスト低減がはかれるため、
より望ましい。前記のサーマルヘッド用基板にＰＶＤ、
ＣＶＤ等の薄膜プロセスと通常のフォトリソグラフィに
よりパターニングを行い、発熱部３を形成した後、保護
層１０を成膜し、所定のカット位置１２で切断してサー
マルヘッドを得る。(2) The method for manufacturing the thermal head of the present invention will be explained based on the drawings, and the substrate materials include alumina, glass,
Various materials can be used, such as metal treated with insulation. Fifth
In the figure, after grooves 11 are formed on a substrate 1, glass paste is printed by screen printing on the boundary 6 of the grooves 11 so as to face each other with the grooves 11 interposed therebetween, and then fired. A substrate for a thermal head on which a glass glaze 2 is formed is obtained. Furthermore, as shown in Fig. 6, it is possible to form the glass glaze 2 only on one side of the grooved part 11 without facing it, but by forming it facing each other, the process can be simplified and costs can be reduced. Because it is measured,
More desirable. PVD on the thermal head substrate,
After patterning is performed using a thin film process such as CVD and ordinary photolithography to form the heat generating portion 3, a protective layer 10 is formed and cut at a predetermined cut position 12 to obtain a thermal head.
［発明の効果］
以上のように、本発明によれば、より曲率半径の小さな
ガラスグレーズ面を安定して製造ができるようになり、
高画質化が可能である。更に、グレーズ下に導電性膜を
設けることにより、１ドツト通電時に対する全ドツト通
電時の発熱温度低下率を低く抑えることができるという
効果がある。[Effects of the Invention] As described above, according to the present invention, a glass glaze surface with a smaller radius of curvature can be stably manufactured.
High image quality is possible. Furthermore, by providing a conductive film under the glaze, there is an effect that the rate of decrease in heat generation temperature when all dots are energized compared to when one dot is energized can be kept low.
また、本発明の製造方法によると、従来の端面型サーマ
ルヘッドの製造方法に比較して一基板内の取り枚数が非
常に多くなるため、大幅なコストダウンが可能になる。Further, according to the manufacturing method of the present invention, the number of sheets to be removed from one substrate is significantly greater than that of the conventional method for manufacturing edge-type thermal heads, so that it is possible to significantly reduce costs.
図は本発明のサーマルヘッドの断面図。
・・・・・・ 基板
・・・・・・ グレーズガラス
・・・・・・ 発熱部
・・・・・・ 傾斜面
・・・・・・ 境界部
・・・・・・ 発熱抵抗層
・・・・・・ セグメント電極
９ ・・・・・・ コモン電極
１０・・・・・・ 保護層
第２図は本発明のサーマルヘッドのガラスグレーズ下に
導電性膜を設けた例を示す断面図。
５ ・・・・・・ 導電性膜
第３図及び第４図は従来のサーマルヘッドの断面図。
第５図及び第６図は本発明のサーマルヘッドの製造方法
を示す斜視図及び拡大断面図。
１１・・・・・・ 溝加工部
１２・・・・・・ カット位置
第７図は従来の端面型サーマルヘッドの製造方法を示す
斜視図。The figure is a sectional view of the thermal head of the present invention. ... Substrate ... Glaze glass ... Heat-generating part ... Inclined surface ... Boundary part ... Heat-generating resistor layer ... ... Segment electrode 9 ... Common electrode 10 ... Protective layer FIG. 2 is a sectional view showing an example in which a conductive film is provided under the glass glaze of the thermal head of the present invention. 5... Conductive film FIGS. 3 and 4 are cross-sectional views of a conventional thermal head. FIG. 5 and FIG. 6 are a perspective view and an enlarged sectional view showing the method of manufacturing a thermal head of the present invention. 11...Groove processing portion 12...Cut position FIG. 7 is a perspective view showing a conventional method of manufacturing an end face type thermal head.
Claims (2)
ガラスグレーズ上に形成された発熱部とを有するサーマ
ルヘッドに於いて、前記基板の少なくとも一端に傾斜面
を形成し、少なくとも、該傾斜面と基板の成膜面の境界
部にかかるように前記ガラスグレーズが形成され、該傾
斜面と基板面の境界部の近傍、望ましくは、該境界部上
にかかるように、前記発熱部が形成されていることを特
徴とするサーマルヘッド。(1) A substrate, a glass glaze formed on the substrate,
In a thermal head having a heat generating part formed on a glass glaze, an inclined surface is formed on at least one end of the substrate, and the glass is formed so as to span at least a boundary between the inclined surface and the film-forming surface of the substrate. A thermal head characterized in that a glaze is formed and the heat generating section is formed near a boundary between the inclined surface and the substrate surface, preferably over the boundary.
され、前記溝を介して対向するようにガラスグレーズ及
び発熱部を形成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, characterized in that a sloped surface is formed by processing a groove in a substrate in advance, and a glass glaze and a heat generating part are formed so as to face each other with the groove interposed therebetween.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP34071789A JPH03199055A (en) | 1989-12-28 | 1989-12-28 | Thermal head and manufacture thereof |
| EP90107840A EP0395001B1 (en) | 1989-04-26 | 1990-04-25 | Thermal print head and method of making same |
| DE69005014T DE69005014T2 (en) | 1989-04-26 | 1990-04-25 | Thermal print head and process for its manufacture. |
| US07/514,223 US5231420A (en) | 1989-04-26 | 1990-04-25 | Thermal print head |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP34071789A JPH03199055A (en) | 1989-12-28 | 1989-12-28 | Thermal head and manufacture thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH03199055A true JPH03199055A (en) | 1991-08-30 |
Family
ID=18339639
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP34071789A Pending JPH03199055A (en) | 1989-04-26 | 1989-12-28 | Thermal head and manufacture thereof |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH03199055A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012126048A (en) * | 2010-12-16 | 2012-07-05 | Rohm Co Ltd | Thermal printer head, and manufacturing method thereof |
| JP2013202968A (en) * | 2012-03-29 | 2013-10-07 | Toshiba Hokuto Electronics Corp | Thermal print head and thermal printer |
-
1989
- 1989-12-28 JP JP34071789A patent/JPH03199055A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012126048A (en) * | 2010-12-16 | 2012-07-05 | Rohm Co Ltd | Thermal printer head, and manufacturing method thereof |
| JP2013202968A (en) * | 2012-03-29 | 2013-10-07 | Toshiba Hokuto Electronics Corp | Thermal print head and thermal printer |
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| JPS63267566A (en) | Thermal head | |
| JPS60171170A (en) | Thermal head | |
| JPH01299061A (en) | Thermal head |