JPH0858130A - Thermal head and printer using the same - Google Patents

Thermal head and printer using the same

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Publication number
JPH0858130A
JPH0858130A JP20184394A JP20184394A JPH0858130A JP H0858130 A JPH0858130 A JP H0858130A JP 20184394 A JP20184394 A JP 20184394A JP 20184394 A JP20184394 A JP 20184394A JP H0858130 A JPH0858130 A JP H0858130A
Authority
JP
Japan
Prior art keywords
substrate
common electrode
electrode line
row
thermal head
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
JP20184394A
Other languages
Japanese (ja)
Inventor
Hiroaki Onishi
弘朗 大西
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.)
Rohm Co Ltd
Original Assignee
Rohm 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 Rohm Co Ltd filed Critical Rohm Co Ltd
Priority to JP20184394A priority Critical patent/JPH0858130A/en
Publication of JPH0858130A publication Critical patent/JPH0858130A/en
Pending legal-status Critical Current

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Abstract

PURPOSE: To obtain a thermal head constituted so that the effect of the irregularity of the resistance values of the common electrode lines connected to respective heating regions is reduced by ensuring the capacity corresponding to the current supply quantity of the heating regions while drawing out the common electrode lines in two directions to keep the widths of them narrow. CONSTITUTION: A plurality of heating regions 3 are provided on the surface of a substrate 1 having a rectangular shape in a plan view almost in parallel to one side of the substrate 1 in a row and a plurality of individual electrode lines 5 supplying a current to the heating regions 3 and a common electrode line 6 are led out toward one side of the substrate 1 crossing the row of the heating regions 3 at a right angle. The common electrode line 6 is constituted of the row of the heating regions 3, the main body part 6A formed in a strip like shape between the row of the heating regions and one side of the substrate 1 almost parallel to said row and a pair of the extended parts 6B, 6C connected to both end parts of the main body part 6A and drawn out along the peripheral part of the substrate 1. The width of the extended part 6C shorter in the distance up to the side of the substrate 1 among the extended parts 6B, 6C is formed so as to be finer than that of the other extended part 6B.

Description

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

【0001】[0001]

【産業上の利用分野】本発明は、感熱紙を熱によって発
色させたり、インクリボンを介して被印字体にインクを
転写して印字するサーマルヘッドおよびこれを用いたプ
リンタに関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thermal head for coloring a thermal paper by heat or transferring ink to a printing medium through an ink ribbon for printing, and a printer using the thermal head.

【0002】[0002]

【従来の技術】従来のサーマルヘッドの一例を図5に示
すシリアルヘッドを例にとって以下に説明する。この種
のサーマルヘッドは、平面視長方形状のセラミック基板
10の表面に、その長辺10Aの長手方向と略平行に複
数の発熱領域11Aないし11Jを列状に配置して発熱
領域列11を形成し、当該各発熱領域11Aないし11
Jにはその発熱領域11Aないし11Jに通電するため
の個別電極ライン12Aないし12Jと共通電極ライン
13とがそれぞれ接続され、前記個別電極ライン12A
ないし12Jの個別電極ライン群12と、共通電極ライ
ン13とは、前記基板10の1つの短辺10Bまで延長
して引き出される。前記共通電極ライン13は全ての発
熱領域11で共用する1つのラインで構成される一方、
前記個別電極ライン群12はそれぞれ独立して図示しな
い駆動ICに接続される。そして、前記共通電極ライン
13と個別電極ライン群12との間に例えば24ボルト
の電圧が加えられ、外部からの印字を指令する信号に基
づいて駆動ICが前記個別電極ライン12Aないし12
Jを選択的にONまたはOFFすることにより、前記発
熱領域11に通電して昇温するか通電を解除する。前記
個別電極ライン群12および共通電極ライン13は、金
粒子などを含有する導電ぺーストを印刷焼成したり、他
の方法としてスパッタリングにて形成している。
2. Description of the Related Art An example of a conventional thermal head will be described below using the serial head shown in FIG. 5 as an example. In this type of thermal head, a plurality of heat generating regions 11A to 11J are arranged in a line on the surface of a ceramic substrate 10 having a rectangular shape in plan view in a direction substantially parallel to the longitudinal direction of its long side 10A to form a heat generating region row 11. Then, the respective heat generating regions 11A to 11
Individual electrode lines 12A to 12J for energizing the heat generating regions 11A to 11J and a common electrode line 13 are connected to J, respectively.
The individual electrode line group 12 of 12 to 12J and the common electrode line 13 are extended and drawn out to one short side 10B of the substrate 10. While the common electrode line 13 is composed of one line shared by all the heat generation regions 11,
The individual electrode line groups 12 are independently connected to a drive IC (not shown). Then, a voltage of, for example, 24 volts is applied between the common electrode line 13 and the individual electrode line group 12, and the drive IC causes the drive electrode ICs to output the individual electrode lines 12A to 12 based on a signal for instructing printing from the outside.
By selectively turning J on or off, the heat generation region 11 is energized to raise its temperature or deenergized. The individual electrode line group 12 and the common electrode line 13 are formed by printing and firing a conductive paste containing gold particles or the like, or by sputtering as another method.

【0003】[0003]

【発明が解決しようとする課題】しかしながら、近年こ
のサーマルヘッド分野において、ハンディタイプのパソ
コン/ワープロの普及により(1)低電力駆動(例えば
12Vのバッテリ駆動)可能にする要求に伴う発熱領域
11Aないし11Jの低抵抗値化、および印字後にすぐ
に印字状態を確認できるように発熱領域列11を基板1
0の端辺の可及的に近づける(2)エッジタイプにする
ことが要求されている。しかしながら、上述した従来の
サーマルヘッドでは、このような要求に下記の理由によ
り対応することが困難なものであった。以下その理由を
詳述する。 (1)低電力駆動 従来のヘッドでは、前記発熱領域11から基板10の短
辺10Bまで延長される個別電極ライン12および共通
電極ライン13の長さが個々の発熱領域11ごとに異な
る(図5の符号L1、L2参照)ことから、個々の発熱
領域列11の共通電極ライン13の配線抵抗が異なり、
通電時における各発熱領域11ごとの発熱量にばらつき
が生じるといった問題があった。この発熱量のばらつき
は、発熱領域11Aないし11Jの抵抗値が低くなれば
なるほど顕著となる。
However, in the field of thermal heads in recent years, due to the widespread use of handy type personal computers / word processors, (1) the heat generation region 11A or 11A which accompanies a request to enable low power drive (for example, 12V battery drive). 11J lower resistance value, and the heating area row 11 is set on the substrate 1 so that the printed state can be checked immediately after printing.
It is required to make the edge type (2) which is as close as possible to the edge of 0. However, it is difficult for the above-described conventional thermal head to meet such a request for the following reasons. The reason will be described in detail below. (1) Low power drive In the conventional head, the lengths of the individual electrode lines 12 and the common electrode lines 13 extending from the heat generation region 11 to the short side 10B of the substrate 10 are different for each heat generation region 11 (FIG. 5). Therefore, the wiring resistance of the common electrode line 13 of each heat generation region row 11 is different,
There is a problem in that the amount of heat generated by each heat generation region 11 varies when energized. The variation in the heat generation amount becomes more remarkable as the resistance value of the heat generation regions 11A to 11J becomes lower.

【0004】このばらつきが生じる理由を、図5を回路
的に示した説明図(図6)に基づいてさらに詳述する。
図6において、図5で示した例えば符号と同一符号のも
のはそれぞれ図5のものを回路的に置き換えたものを示
す。ここでまず個別電極12に着目すると、各個別電極
12Aないし12Jはいずれも同じ工程をへて形成され
た略同一断面積、同一材料からなるものである。そし
て、図6から明かなように、発熱領域11から基板10
の短辺10Bまで延長される個別電極ライン群12の長
さは12A<12B<12C<12D<12E<12F
<12G<12H<12I<12Jの関係が成り立ち、
前述したように略同一断面積、同一材料であるから、前
記各個別電極ラインの抵抗値はL/S(L;長さ、S;
断面積)に比例の関係が成り立つから、前述したように
断面積が一定の場合その長さに比例して大となる。すな
わち、図6に示す個別電極ライン12Aないし12Jの
各抵抗値は、12A<12B<12C<12D<12E
<12F<12G<12H<12I<12Jの関係とな
り、各発熱領域11Aないし11Jに印加される電圧値
が一定であると、接続される個別電極ライン12Aない
し12Jの抵抗値が大きいほど発熱領域11Aないし1
1Jの発熱量が小さくなるといった現象が生じる。
The reason why this variation occurs will be described in more detail with reference to an explanatory view (FIG. 6) showing the circuit of FIG.
In FIG. 6, the same reference numerals as those shown in FIG. 5, for example, denote the same reference numerals as those in FIG. First, focusing on the individual electrode 12, each of the individual electrodes 12A to 12J is formed of the same process and has substantially the same cross-sectional area and the same material. Then, as is apparent from FIG. 6, the heat generation region 11 to the substrate 10
The length of the individual electrode line group 12 extended to the short side 10B is 12A <12B <12C <12D <12E <12F.
The relationship of <12G <12H <12I <12J is established,
As described above, the resistance values of the individual electrode lines are L / S (L; length, S;
Since a proportional relationship is established with respect to (cross-sectional area), as described above, when the cross-sectional area is constant, it becomes large in proportion to its length. That is, the resistance values of the individual electrode lines 12A to 12J shown in FIG. 6 are 12A <12B <12C <12D <12E.
The relationship of <12F <12G <12H <12I <12J is established, and when the voltage value applied to each heat generating area 11A to 11J is constant, the heat generating area 11A increases as the resistance value of the connected individual electrode lines 12A to 12J increases. Through 1
The phenomenon that the heat generation amount of 1 J becomes small occurs.

【0005】一方、前記共通電極ライン13において
も、図6に示すように、発熱領域11Aに比べて発熱領
域11Bは、13Aの抵抗値の分だけ共通電極ラインの
抵抗値が大となり、順次13Bないし13Iの抵抗値が
加えられた分だけ発熱領域11Cないし11Jの共通電
極ライン13の抵抗値が順次大となることから、前述し
た個別電極ライン群12の抵抗値のバラツキと相まって
前記発熱量のバラツキが更に大きくなるといった問題が
あった。
On the other hand, in the common electrode line 13 as well, as shown in FIG. 6, in the heat generating area 11B, the resistance value of the common electrode line becomes larger by the resistance value of 13A than in the heat generating area 11A, and sequentially 13B. The resistance values of the common electrode lines 13 in the heat generation regions 11C to 11J sequentially increase by the amount of the resistance values of 13 to 13I added. There was a problem that the variation became even larger.

【0006】図7に示すのは、図5のサーマルヘッドで
感熱紙に印字したときの印字状態を示す模式図である。
発熱領域11Aないし11Jで印字した印字ドットはA
ないしJに順次対応するもので、発熱領域11Aないし
11Jの発熱量に応じて順次印字ドットAからJに至る
につれて発色面積が小さくなる。さらに、サーマルヘッ
ドの高速印字の要求から2列等の複数同時印字の手法が
採用されつつある。
FIG. 7 is a schematic diagram showing a printing state when printing is performed on thermal paper with the thermal head of FIG.
The print dots printed in the heating areas 11A to 11J are A
To J, the coloring area decreases in order from the print dots A to J in accordance with the heat generation amount of the heat generation regions 11A to 11J. Further, due to the demand for high-speed printing of the thermal head, a method of simultaneously printing a plurality of lines, such as two lines, is being adopted.

【0007】このように印字ドット数が多くなると、図
7を参照すれば明かなように、印字ドットAとJとの発
色面積の違いが視覚的に非常に目立つものとなる。前述
したような個別電極ライン群12の抵抗値のバラツキを
改善する1つの手段として、特開昭57ー201676
号に前記個別電極ライン12Aないし12Jの断面積を
長さに応じて大とし、各個別電極ライン群12の発熱領
域11から基板10の短辺10Bまでの抵抗値を一定に
揃えようとする手法が提案されている。しかしながら、
このような手法の場合、個々の個別電極ライン12Aな
いし12Jを形成する場合、それぞれの厚みを多層印刷
で個別に制御して形成する大変面倒なものとなり、実用
に耐るものではない。また、このものでは個別電極ライ
ンによる発熱量のバラツキは改善可能であるものの、共
通電極ラインの抵抗値のバラツキは全く改善できるもの
でなかった。 (2)エッジタイプ また、前述したように近年、前記発熱領域列11を基板
10の長辺10Aにできるだけ近づける、いわゆるリア
ルエッジとも呼ばれる構造が取り沙汰されている。
When the number of print dots is increased in this way, as apparent from FIG. 7, the difference in the coloring area between the print dots A and J becomes visually very noticeable. As one means for improving the variation in the resistance value of the individual electrode line group 12 as described above, JP-A-57-201676 is known.
No. 12A to 12J, the cross-sectional area of the individual electrode lines 12A to 12J is increased according to the length, and the resistance value from the heat generation region 11 of each individual electrode line group 12 to the short side 10B of the substrate 10 is made uniform. Is proposed. However,
In the case of such a method, when each individual electrode line 12A to 12J is formed, it is very troublesome to form each individual electrode line by individually controlling the thickness by multilayer printing, and it is not practical. In addition, although the variation in the amount of heat generated by the individual electrode lines can be reduced in this example, the variation in the resistance value of the common electrode line cannot be reduced at all. (2) Edge Type In addition, as described above, in recent years, a structure called a real edge has been proposed in which the heat generation region array 11 is brought as close as possible to the long side 10A of the substrate 10.

【0008】ところが、図5に示すように、発熱領域1
1Aないし11Jを1つの共通電極ライン13に接続
し、この共通電極ライン13の一方端のみを基板10の
短辺10Bに延長する構造のものの場合、共通電極ライ
ンの電流容量を発熱領域11Aないし11Jを同時に通
電発熱したときの電流を許容する必要から、前記共通電
極ライン13を広幅に形成する必要があり、前述したリ
アルエッジの要求に応え難かった。特に発熱領域11A
ないし11Jの数が多くなる、前記複数列の同時印字用
のサーマルヘッドの場合には、共通電極ライン13の幅
を更に広幅にする必要があった。
However, as shown in FIG.
In the case of the structure in which 1A to 11J are connected to one common electrode line 13 and only one end of the common electrode line 13 is extended to the short side 10B of the substrate 10, the current capacity of the common electrode line is changed to the heating regions 11A to 11J. It is necessary to form the common electrode line 13 in a wide width because it is necessary to allow a current when simultaneously energizing and generating heat, and it is difficult to meet the requirement of the real edge described above. Especially the heating area 11A
In the case of the thermal head for simultaneous printing of a plurality of columns, which has a large number of to 11J, it is necessary to further widen the width of the common electrode line 13.

【0009】本発明は以上のような従来の問題を解決
し、各発熱領域への配線抵抗の影響を低減するととも
に、リアルエッジタイプのサーマルヘッドに適用可能な
サーマルヘッドおよびこれを用いたプリンタを提供する
ことを目的とする。
The present invention solves the above conventional problems, reduces the influence of wiring resistance on each heat generation area, and provides a thermal head applicable to a real edge type thermal head and a printer using the same. The purpose is to provide.

【0010】[0010]

【課題を解決するための手段】本発明者は、上記技術的
課題を達成するために鋭意研究を重ねた結果、図7に示
すように、基板の端縁から発熱領域が離れるにつれて漸
次に発熱量が小さくなり、印字ドットの大きさのバラツ
キが視覚的に目立ってしまうことに着目し、共通電極ラ
インを2方向に引き出してその幅を狭く保ちつつ、発熱
領域の通電量に応じた容量を確保することを見いだし
た。
As a result of earnest studies to achieve the above-mentioned technical problems, the present inventor gradually generated heat as the heat generating region was separated from the edge of the substrate, as shown in FIG. Paying attention to the fact that the amount becomes small and the variation in the size of the print dots becomes noticeable, the common electrode line is drawn out in two directions and the width is kept narrow, while the capacity corresponding to the amount of electricity supplied to the heating area is set. Found out to secure.

【0011】すなわち、本発明では、平面視矩形状の基
板の表面に複数の発熱領域を前記基板の一辺と略平行に
列状に設け、前記各発熱領域に通電する複数の個別電極
ラインと共通電極ラインとを前記発熱領域の列と直交す
る基板の一方の辺部へ導出するサ−マルヘッドにおい
て、前記共通電極ラインは、発熱領域の列と、この列と
略平行な基板の一辺との間に帯状に形成する本体部と、
当該本体部から連なり前記基板の周辺部分に沿って前記
基板の引き出される一対の延長部とからなり、前記一対
の延長部のうち、その導出される基板の辺までの距離が
短い方の延長部の幅を細く形成したことを特徴とする。
That is, according to the present invention, a plurality of heat generating regions are provided in a row on the surface of a substrate having a rectangular shape in a plan view substantially in parallel with one side of the substrate, and are common to a plurality of individual electrode lines for conducting electricity to each of the heat generating regions. In a thermal head for leading an electrode line to one side portion of a substrate orthogonal to the row of heat generating regions, the common electrode line is provided between the row of heat generating regions and one side of the substrate substantially parallel to the row. A body part formed in a strip shape on the
The pair of extension parts that are connected from the main body part and are pulled out along the peripheral portion of the substrate, and the extension part of the pair of extension parts that has a shorter distance to the side of the derived substrate. Is characterized in that it has a narrow width.

【0012】前記導出される基板の辺までの距離が短い
方の延長部の幅を、漸次幅細く形成することもできる。
そして前記発熱領域の抵抗値が20オーム以下の低抵抗
のサーマルヘッドであって、このサーマルヘッドを前記
個別電極ラインと共通電極ラインとに3ボルトないし5
ボルトの電源電圧(例えば電池)を備えたプリンタに採
用すると良い。
The width of the extension portion having a shorter distance to the side of the derived substrate may be gradually narrowed.
A low resistance thermal head having a resistance value of 20 ohms or less in the heat generating region, the thermal head being provided with 3 V to 5 V between the individual electrode line and the common electrode line
It may be adopted for a printer having a power supply voltage of volt (for example, a battery).

【0013】[0013]

【発明の作用】本発明では、共通電極ラインを、発熱領
域の列と略平行な基板の一辺との間に帯状に形成する本
体部と、当該本体部の両端部から電気的に連なり前記基
板の周辺部分に沿って、前記発熱領域の列と直交する基
板の一方の辺部へ延長した一対の延長部とに分離したこ
とによって、前記共通電極ラインの幅を細くすることが
できる。そして、前記一対の延長部のうち、その引き出
(導出)される基板の辺までの距離が短い方の延長部を
他の延長部より幅を細く叉は漸次幅細く形成して、共通
電極ラインと接続される各発熱領域との間での抵抗値を
均一に近づけるように働く。
According to the present invention, a common electrode line is formed in a strip shape between a row of heat generating regions and one side of the substrate substantially parallel to the main body portion, and the substrate is electrically connected from both end portions of the main body portion. The width of the common electrode line can be reduced by separating the common electrode line along a peripheral portion thereof into a pair of extension portions extending to one side portion of the substrate orthogonal to the row of the heat generation regions. Then, of the pair of extension portions, the extension portion having a shorter distance to the side of the substrate to be pulled out (derived) is formed to be narrower or gradually narrower than the other extension portions to form a common electrode. It works so that the resistance value between the line and each of the heat generating regions connected to each other may be made uniform close to each other.

【0014】また、前記本体部は、導出される基板の辺
までの距離が短い方に向かって漸次幅を細く形成するこ
ともできる。さらに、前述したサーマルヘッドの発熱領
域の抵抗値が20オーム以下の低抵抗とし、前記個別電
極ラインと共通電極ラインとに接続する電源電圧が3ボ
ルトないし5ボルトとすることにより、電池駆動可能と
なる。
Further, the main body portion may be formed so that the width gradually becomes smaller toward the side where the side of the substrate to be led out is shorter. Further, the resistance value of the heat generation area of the thermal head is set to a low resistance of 20 ohms or less, and the power source voltage connected to the individual electrode line and the common electrode line is set to 3 to 5 volts so that the battery can be driven. Become.

【0015】また、前記グループ内での個別電極ライン
の幅を、前記基板の端縁と発熱領域との距離が長いもの
ほど広幅に形成することにより、各個別電極ラインの抵
抗値の均一化を図ることができる。
Further, the width of the individual electrode line in the group is made wider as the distance between the edge of the substrate and the heat generating region is wider, so that the resistance value of each individual electrode line is made uniform. Can be planned.

【0016】[0016]

【実施例】本発明を薄膜タイプのサーマルヘッドに適用
した場合の一実施例を図1および図2に基づいて以下に
説明する。図において1はセラミックからなる基板であ
って、この基板1の中央部分の表面1Aに、帯状の部分
グレーズ2を印刷焼成にて設け、この部分グレーズ2の
表面に発熱抵抗材料としてのチッ化タンタル等をスパッ
タリングにて膜状に形成し、前記チッ化タンタルからな
る膜を含み基板1全面にアルミニウムからなる導体膜を
スパッタリングで形成したの後、前記チッ化タンタルの
膜および導体膜の所定箇所をエッチングにて除去して、
発熱領域3および個別電極ライン5ないし共通電極ライ
ン6を適宜のレイアウトに形成する。そして、最終的に
残存した前記チッ化タンタルの膜(発熱領域3)および
導体膜(個別電極ライン5、共通電極ライン6)の表面
および露出した基板1の表面に、SiO2からなる耐酸
化防止層およびSiN系またはTa25等からなる耐摩
耗層を順次スパッタリングにて形成することにより完成
されるが、説明の便宜上これら耐酸化防止層、耐摩耗層
を図面から省略している。
DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is applied to a thin film type thermal head will be described below with reference to FIGS. In the figure, reference numeral 1 is a substrate made of ceramics, and a band-shaped partial glaze 2 is provided by printing and firing on the surface 1A of the central portion of the substrate 1, and the surface of this partial glaze 2 is tantalum nitride as a heating resistance material. Etc. are formed into a film by sputtering, and a conductor film made of aluminum is formed on the entire surface of the substrate 1 including the film made of tantalum nitride by sputtering, and then the tantalum nitride film and predetermined portions of the conductor film are formed. Remove by etching,
The heat generating region 3 and the individual electrode lines 5 or the common electrode lines 6 are formed in an appropriate layout. Then, on the surfaces of the tantalum nitride film (heat generation region 3) and the conductor film (individual electrode lines 5 and common electrode lines 6) that have finally remained and the exposed surface of the substrate 1, oxidation resistance of SiO 2 is prevented. This layer is completed by sequentially forming a layer and a wear-resistant layer made of SiN-based material or Ta 2 O 5 by sputtering, but these oxidation-resistant layers and wear-resistant layers are omitted from the drawings for convenience of explanation.

【0017】前述したようにして製造されてサーマルヘ
ッドは、平面視矩形状の基板1の表面1Aに複数の発熱
領域3・・3を前記基板1の一辺1Bと略平行に列状に
設け、前記各発熱領域3に通電する複数の個別電極ライ
ン5と共通電極ライン6とを前記発熱領域3・・3の列
と直交する基板1の一方の辺1C側へ導出してなり、前
記共通電極ライン6は、発熱領域3・・3の列と、この
列と略平行な基板1の一辺1Bとの間に帯状に形成する
本体部6Aと、当該本体部6Aから連なり前記基板1の
周辺部分に沿って前記基板1の一方の辺1Cへ延長する
一対の延長部6B、6Cとからなり、前記一対の延長部
6B、6Cのうち、前記一方の辺1Cまでの距離が短い
方の延長部6Cの幅を長い方の延長部6Bに比べて細く
形成してある。
The thermal head manufactured as described above is provided with a plurality of heat generating regions 3, ... On the surface 1A of the substrate 1 having a rectangular shape in plan view in a line substantially parallel to one side 1B of the substrate 1, A plurality of individual electrode lines 5 and a common electrode line 6 that conduct electricity to each of the heat generating regions 3 are led out to one side 1C side of the substrate 1 orthogonal to the row of the heat generating regions 3 ... The line 6 includes a body portion 6A formed in a strip shape between a row of the heat generation regions 3 ... 3 and one side 1B of the substrate 1 substantially parallel to the row, and a continuous portion of the body portion 6A. A pair of extension parts 6B and 6C extending along one side 1C of the substrate 1 along which the extension part having the shorter distance to the one side 1C of the pair of extension parts 6B and 6C. The width of 6C is narrower than that of the longer extension 6B.

【0018】前記共通電極ライン6の延長部6B、6C
の幅を引き出す辺1Cとの距離が短くなるほど細く形成
することにより、距離の短い延長部6Cの抵抗値を高
く、距離の長い延長部6Bの抵抗値を低くして、各発熱
領域3に影響する共通電極ライン6の抵抗値を均一に近
づけることが可能となる。 また、共通電極ライン6を
2方向に引き出し図示しない電源に接続するようにして
あるから、従来のように一方向のみに引き出す共通電極
ラインの幅に比べ、共通電極ライン6の本体部6Aの幅
を細くしても従来以上の電流容量を確保できるととも
に、本体部6Aの幅を細くして発熱領域3・・3の列を
基板の辺1Bにより近づけてリアルエッジタイプのサー
マルヘッドを提供できる。
Extensions 6B and 6C of the common electrode line 6
By making the width narrower as the distance from the side 1C that draws out the width is increased, the resistance value of the extension portion 6C having a short distance is increased, and the resistance value of the extension portion 6B having a long distance is decreased to affect each heat generation region 3. It is possible to make the resistance value of the common electrode line 6 that is closer to uniform. Further, since the common electrode line 6 is drawn out in two directions and connected to a power source (not shown), the width of the main body portion 6A of the common electrode line 6 is larger than the width of the common electrode line drawn only in one direction as in the conventional case. It is possible to provide a real edge type thermal head by making the width of the main body portion 6A narrower and bringing the rows of the heat generating regions 3 ...

【0019】前記基板1の辺1Cまで延設した個別電極
ライン5と共通電極6の先端部分は、図示しない例えば
フレキシブルケーブルを介して前記発熱領域3を個別に
通電または通電を解除(オン/オフ)する駆動IC(図
示しない)に接続している。そしてこの駆動ICは3V
ないし5Vの図示しない直流電源(電池)に接続されて
いる。
The tip portions of the individual electrode lines 5 and the common electrode 6 extending to the side 1C of the substrate 1 are individually energized or deenergized (on / off) in the heat generating region 3 via a flexible cable (not shown). 2) is connected to a driving IC (not shown). And this drive IC is 3V
It is connected to a DC power supply (battery) (not shown) of 5 to 5V.

【0020】図3に示すのは、前記実施例の変形例であ
る。この実施例では、前記共通電極ライン6の本体部6
Aの幅を均一な幅とし、短い方の延長部6Cのみを幅細
としたが、これに換えて前記共通電極ライン6の本体部
6Aと、これに連なる延長部6Cとを、前記基板1の辺
1Cに近づくにつれ漸次幅細く形成したものである。ま
た、もう一つの違いは、前記実施例では、個別電極ライ
ン5A、5B、5C、5D、5Eを全て同一幅とした
が、この幅をこの変形例では、基板1の辺1Cと発熱領
域3・・3とを繋ぐ個別電極ライン5A、5B、5C、
5D、5E、5Fの長いものほど幅を広く構成してある
(個別電極ラインの幅の関係:5A<5B<5C<5D
<5E<5F)。
FIG. 3 shows a modification of the above embodiment. In this embodiment, the body portion 6 of the common electrode line 6 is
Although the width of A is made uniform and only the shorter extension 6C is made narrower, instead of this, the main body 6A of the common electrode line 6 and the extension 6C continuing to this are provided on the substrate 1 The width is gradually reduced toward the side 1C. Another difference is that the individual electrode lines 5A, 5B, 5C, 5D, and 5E have the same width in the above-described embodiment, but in this modified example, this width is the side 1C of the substrate 1 and the heat generating region 3. ..Individual electrode lines 5A, 5B, 5C that connect with 3
The longer the 5D, 5E, and 5F, the wider the width (the relationship of the widths of the individual electrode lines: 5A <5B <5C <5D.
<5E <5F).

【0021】前述したように、共通電極ライン6の幅を
導出する基板1の辺1Cに近づくにつれて漸次幅細に形
成してあるから、共通電極ライン6に前記実施例のよう
な角部6D(図1参照)が形成されない構成でもって、
発熱領域3の発熱量を略均一に保つことが可能となる。
角部6Dが形成されないからその部分での電流集中が回
避できる。
As described above, since the width of the common electrode line 6 is gradually reduced toward the side 1C of the substrate 1 from which the width is derived, the common electrode line 6 has the corner portion 6D (as in the above embodiment). (See FIG. 1) is not formed,
It is possible to keep the heat generation amount of the heat generation region 3 substantially uniform.
Since the corner 6D is not formed, current concentration at that part can be avoided.

【0022】また、前記本体部6A内における電圧降下
の差の均一化を図ることが可能となる。図4に示すのが
本変形例のサーマルヘッドを用いて感熱紙に印字した時
の印字状態を示す模式図である。図から明かなように、
この変形例では前述したように個別電極ライン5と共通
電極ライン6との抵抗値を略均一にするようにしている
から、印字ドットAないしFは全て略均一の大きさとな
る。
Further, it is possible to make the difference in voltage drop in the main body 6A uniform. FIG. 4 is a schematic diagram showing a printing state when printing is performed on thermal paper using the thermal head of this modification. As you can see from the figure,
In this modification, the resistance values of the individual electrode lines 5 and the common electrode lines 6 are made substantially uniform as described above, so that all the printing dots A to F have substantially uniform sizes.

【0023】前述した実施例では、個別電極ライン5の
抵抗値の調整を行っていないが、共通電極ライン6の抵
抗値を調整することによって、個々の発熱領域3に接続
される個別電極ライン5および共通電極ライン6とのト
ータル抵抗値の均一化を図り、図4に示すような印字ド
ットAないしFを得ることが可能となる。 なお、上記
実施例では薄膜タイプのサーマルヘッドを例にとって説
明したがこれに限らず、酸化ルテニュウムを主成分とす
る抵抗ペーストを印刷焼成して発熱領域を形成する厚膜
タイプのサーマルヘッドにも適宜採用することが可能で
ある。
In the above-described embodiment, the resistance value of the individual electrode line 5 is not adjusted, but by adjusting the resistance value of the common electrode line 6, the individual electrode line 5 connected to each heat generating area 3 is adjusted. Also, the total resistance value with the common electrode line 6 can be made uniform, and the print dots A to F as shown in FIG. 4 can be obtained. Although the thin film type thermal head has been described as an example in the above embodiment, the present invention is not limited to this, and a thick film type thermal head for forming a heat generating region by printing and firing a resistance paste containing ruthenium oxide as a main component is also suitable. It is possible to adopt.

【0024】[0024]

【発明の効果】以上のような本発明の構成によれば以下
のような効果を奏する。すなわち、本発明では、共通電
極ラインを、発熱領域の列と略平行な基板の一辺との間
に帯状に形成する本体部と、当該本体部の両端部から電
気的に連なり前記基板の周辺部分に沿って、前記発熱領
域の列と直交する基板の一方の辺部へ延長した一対の延
長部とに分離したことによって、前記共通電極ラインの
幅を細くすることができる。このように共通電極ライン
を細くすることにより、発熱領域の列とこれと向かい合
う基板の辺との距離を短くしてリアルエッジのサーマル
ヘッドを提供できる。このようなサーマルヘッドをプリ
ンタに用いた場合、印字したものをすぐに確認できると
いった効果を有する。
According to the structure of the present invention as described above, the following effects are obtained. That is, according to the present invention, a common electrode line is formed in a strip shape between a row of heat generation regions and one side of the substrate substantially parallel to a main body portion, and a peripheral portion of the substrate electrically connected from both end portions of the main body portion. The width of the common electrode line can be reduced by separating the column of the heat generating regions into a pair of extension portions extending to one side portion of the substrate along the line. By thinning the common electrode line in this manner, it is possible to provide a real-edge thermal head by shortening the distance between the row of heat generating areas and the side of the substrate facing this. When such a thermal head is used in a printer, it has an effect that what is printed can be immediately confirmed.

【0025】そして、前記一対の延長部のうち、その引
き出される基板の辺までの距離が短い方の延長部を他の
延長部より幅を細く叉は漸次幅細く形成して、共通電極
ラインと接続される各発熱領域との間での抵抗値を均一
に近づけことが可能となるから、サーマルヘッドの複数
の発熱領域の発熱量を均一に近づけて、印字ドットを略
均一なものとすることができる。
Then, of the pair of extension portions, the extension portion having a shorter distance to the side of the substrate to be pulled out is formed to be narrower or gradually narrower than the other extension portions to form a common electrode line. Since it is possible to make the resistance values of the respective heat generation areas connected to each other uniform, the heat generation amounts of the plurality of heat generation areas of the thermal head should be made uniform so that the print dots are substantially uniform. You can

【0026】また、前述したサーマルヘッドの発熱領域
の抵抗値が20オーム以下の低抵抗とし、前記個別電極
ラインと共通電極ラインとに接続する電源電圧が3ボル
トないし5ボルトとすることにより、電池駆動可能とな
り、例えばハンデイタイプのプリンタを提供することが
可能となるといった効果を奏する。
Further, the resistance value of the heat generation area of the above-mentioned thermal head is set to a low resistance value of 20 ohms or less, and the power supply voltage connected to the individual electrode line and the common electrode line is set to 3 to 5 volts, whereby the battery is It is possible to drive, and it is possible to provide a handy type printer, for example.

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

【図1】実施例を示す平面図である。FIG. 1 is a plan view showing an embodiment.

【図2】図1のAーA断面図である。FIG. 2 is a sectional view taken along line AA of FIG.

【図3】変形例を示す平面図である。FIG. 3 is a plan view showing a modified example.

【図4】図3で示すサーマルヘッドで感熱紙に印字した
ときの印字ドットの発色状態を示す状態図である。
FIG. 4 is a state diagram showing a color development state of print dots when printing is performed on thermal paper with the thermal head shown in FIG.

【図5】従来のサーマルヘッドを示す平面図である。FIG. 5 is a plan view showing a conventional thermal head.

【図6】図5を回路的に模式した模式図である。FIG. 6 is a schematic diagram schematically showing FIG. 5 as a circuit.

【図7】図5のサーマルヘッドで感熱紙に印字したとき
の印字ドットの発色状態を示す状態図である。
FIG. 7 is a state diagram showing a color development state of print dots when printing is performed on thermal paper with the thermal head of FIG.

【符号の説明】[Explanation of symbols]

1 基板 2 部分グレーズ 3 発熱領域 5 個別電極 6 共通電極 1 Substrate 2 Partial Glaze 3 Heat Generation Area 5 Individual Electrode 6 Common Electrode

Claims (4)

【特許請求の範囲】[Claims] 【請求項1】 平面視矩形状の基板の表面に複数の発熱
領域を前記基板の一辺と略平行に列状に設け、前記各発
熱領域に通電する複数の個別電極ラインと共通電極ライ
ンとを前記発熱領域の列と直交する基板の一方の辺側へ
導出するサ−マルヘッドにおいて、 前記共通電極ラインは、発熱領域の列と、この列と略平
行な基板の一辺との間に帯状に形成する本体部と、当該
本体部の両端部から連なり前記基板の周辺部分に沿って
引き出される一対の延長部とからなり、 前記一対の延長部のうち、導出する基板の辺までの距離
が短い方の延長部の幅を他方の延長部の幅に比して細く
形成したことを特徴とするサーマルヘッド。
1. A plurality of heat generating regions are provided in a row on a surface of a substrate having a rectangular shape in a plan view substantially in parallel with one side of the substrate, and a plurality of individual electrode lines and a common electrode line for energizing each of the heat generating regions are provided. In a thermal head leading out to one side of a substrate orthogonal to the row of heat generating regions, the common electrode line is formed in a band shape between the row of heat generating regions and one side of the substrate substantially parallel to this line. A main body and a pair of extension portions that are continuous from both end portions of the main body portion and are drawn out along the peripheral portion of the substrate, and one of the pair of extension portions that has a shorter distance to the side of the substrate to be led out. The thermal head is characterized in that the width of the extension portion of is made narrower than the width of the other extension portion.
【請求項2】 平面視矩形状の基板の表面に複数の発熱
領域を前記基板の一辺と略平行に列状に設け、前記各発
熱領域に通電する複数の個別電極ラインと共通電極ライ
ンとを前記発熱領域の列と直交する基板の一方の辺側へ
導出するサ−マルヘッドにおいて、 前記共通電極ラインは、発熱領域の列と、この列と略平
行な基板の一辺との間に帯状に形成する本体部と、当該
本体部から連なり前記基板の周辺部分に沿って引き出さ
れる一対の延長部とからなり、 前記一対の延長部のうち、導出する基板の辺までの距離
が短い方の延長部を漸次幅を細く形成したことを特徴と
するサーマルヘッド。
2. A plurality of heat generating regions are provided on a surface of a substrate having a rectangular shape in plan view in a line substantially parallel to one side of the substrate, and a plurality of individual electrode lines and a common electrode line for energizing each heat generating region are provided. In a thermal head leading out to one side of a substrate orthogonal to the row of heat generating regions, the common electrode line is formed in a band shape between the row of heat generating regions and one side of the substrate substantially parallel to this line. And a pair of extension portions that are connected to the main body portion and are drawn out along the peripheral portion of the substrate, wherein the extension portion having the shorter distance to the side of the substrate to be led out of the pair of extension portions. The thermal head is characterized in that the width is gradually narrowed.
【請求項3】 請求項1または2のサーマルヘッドにお
いて、前記本体部は導出する基板の辺までの距離が短い
方の延長部の側に漸次幅細く形成したことを特徴とする
サーマルヘッド。
3. The thermal head according to claim 1 or 2, wherein the main body portion is formed so as to be gradually narrower on the side of the extension portion having a shorter distance to the side of the substrate to be led out.
【請求項4】 請求項1ないし3のサーマルヘッドにお
いて、前記発熱領域の抵抗値が20オーム以下の低抵抗
であって、前記個別電極ラインと共通電極ラインとに接
続する電源電圧が3ボルトないし5ボルトであることを
特徴とするプリンタ。
4. The thermal head according to claim 1, wherein the resistance value of the heat generation region is a low resistance of 20 ohms or less, and the power supply voltage connected to the individual electrode line and the common electrode line is 3 volts or more. A printer characterized by being 5 volts.
JP20184394A 1994-08-26 1994-08-26 Thermal head and printer using the same Pending JPH0858130A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP20184394A JPH0858130A (en) 1994-08-26 1994-08-26 Thermal head and printer using the same

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP20184394A JPH0858130A (en) 1994-08-26 1994-08-26 Thermal head and printer using the same

Publications (1)

Publication Number Publication Date
JPH0858130A true JPH0858130A (en) 1996-03-05

Family

ID=16447817

Family Applications (1)

Application Number Title Priority Date Filing Date
JP20184394A Pending JPH0858130A (en) 1994-08-26 1994-08-26 Thermal head and printer using the same

Country Status (1)

Country Link
JP (1) JPH0858130A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008081949A1 (en) * 2006-12-28 2008-07-10 Kyocera Corporation Recording head and recording device provided with it

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008081949A1 (en) * 2006-12-28 2008-07-10 Kyocera Corporation Recording head and recording device provided with it

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