JP3320151B2 - Thermal print head - Google Patents
Thermal print headInfo
- Publication number
- JP3320151B2 JP3320151B2 JP18000993A JP18000993A JP3320151B2 JP 3320151 B2 JP3320151 B2 JP 3320151B2 JP 18000993 A JP18000993 A JP 18000993A JP 18000993 A JP18000993 A JP 18000993A JP 3320151 B2 JP3320151 B2 JP 3320151B2
- Authority
- JP
- Japan
- Prior art keywords
- heating resistor
- pattern
- electrode
- common electrode
- thermal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Landscapes
- Electronic Switches (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は、サーマルプリントヘッ
ド、特に発熱効率を高めたサーマルプリントヘッドに関
する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thermal print head, and more particularly to a thermal print head having improved heat generation efficiency.
【０００２】[0002]
【従来の技術及びその問題点】従来、厚膜サーマルプリ
ントヘッド（以下、サーマルヘッドという。）は、図４
に示すように絶縁基板５上に各種ペーストを印刷・焼成
してパターンを形成していたが、パターン形成方法とし
て、先ず金ペーストで導体膜を形成した後、エッチング
法で個別電極２のパターンを形成する。次に、この個別
電極２と共通電極１が交互に配置される部分にルテニュ
ーム系抵抗ペーストを用いた発熱抵抗体３を形成し、そ
の上層にガラスペーストからなる保護膜８を形成する。2. Description of the Related Art Conventionally, a thick film thermal print head (hereinafter referred to as a thermal head) is shown in FIG.
The pattern was formed by printing and baking various pastes on the insulating substrate 5 as shown in (1). As a pattern forming method, first, a conductor film was formed with gold paste, and then the pattern of the individual electrodes 2 was formed by etching. Form. Next, a heating resistor 3 using a ruthenium-based resistance paste is formed at a portion where the individual electrodes 2 and the common electrode 1 are alternately arranged, and a protective film 8 made of a glass paste is formed thereon.
【０００３】さらに、このサーマルヘッド基板１上にド
ライバーＩＣ（図示せず）をボンディングし、前記個別
電極２のボンディングパッド部と前記ドライバーＩＣの
ボンディングパッドとを金ワイヤでワイヤボンディング
した後、このボンディング部をシリコーン樹脂でコート
し、カバー、放熱板、フレキシブル端子板等を組み付け
てサーマルヘッドを完成する。Further, a driver IC (not shown) is bonded on the thermal head substrate 1, and a bonding pad portion of the individual electrode 2 and a bonding pad of the driver IC are wire-bonded with a gold wire. The part is coated with silicone resin
Then, a thermal head is completed by assembling a cover, a heat sink, a flexible terminal board, and the like.
【０００４】前記サーマルヘッドにおいて、発熱抵抗体
３を形成する際に使用する抵抗ペーストは、スクリーン
印刷するため、粘度を下げた抵抗ペーストを使用するの
が一般的である。このペーストを印刷すると、印刷され
たパターンの幅方向の両側にてペーストが流れを起こ
し、この両端部には図４の（Ｂ）に示すようにダレ部分
３ａ及び３ｂが発生する。In the thermal head, the resistance paste used when forming the heating resistor 3 is generally a viscosity-reduced resistance paste for screen printing. When this paste is printed, the paste flows on both sides in the width direction of the printed pattern, and sag portions 3a and 3b occur at both ends as shown in FIG. 4B.
【０００５】このダレ部分３ａ及び３ｂは、その膜厚が
所定の値に対し薄く、中央部分よりもその抵抗値が大き
いものとなる。この発熱抵抗体３に通電を行うと、個別
電極２と共通電極１で挟まれた発熱抵抗体が発熱する
が、所定の膜厚の中央部分に対しダレ部分３ａ及び３ｂ
は抵抗値が大きく発熱はするものの、その温度が低く感
熱紙を発色するまでには至らず、電流損失となる。図４
の（Ｂ）において、一般的にはこの損失部分Ｌｃを除く
所定厚さの中央部分Ｌｂは、発熱抵抗体３の全幅Ｌａの
６０〜８０％程度となっている。The sag portions 3a and 3b have a smaller thickness than a predetermined value, and have a larger resistance value than the central portion. When the heating resistor 3 is energized, the heating resistor sandwiched between the individual electrode 2 and the common electrode 1 generates heat. However, sagging portions 3a and 3b
Although the resistance value is large and generates heat, the temperature is low and the color does not reach the color of the thermal paper, resulting in a current loss. FIG.
In (B), generally, the central portion Lb of a predetermined thickness excluding the loss portion Lc is about 60 to 80% of the entire width La of the heating resistor 3.
【０００６】また、発熱抵抗体３が感熱紙の発色に寄与
する発熱部分をみると、図２の（Ｂ）に示すように１素
子の発熱部分は長円形６となり、連続印字した場合には
図３の（Ｂ）に示すように各発色ドット間に隙７ｂがで
きて良好な印字が得られなくなる。Looking at the heat-generating portion where the heat-generating resistor 3 contributes to the color development of the thermal paper, the heat-generating portion of one element becomes an oval 6 as shown in FIG. As shown in FIG. 3B, a gap 7b is formed between the color dots, and good printing cannot be obtained.
【０００７】[0007]
【発明が解決しようとする課題】本発明は前記問題点に
鑑み、前記損失を低減する発熱効率の改善と発色形状、
サイズの拡大を目的とするものである。SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has an object to improve the heat generation efficiency and reduce the loss and improve the coloration shape.
The purpose is to increase the size.
【０００８】[0008]
【課題を解決するための手段】本発明は、絶縁基板上に
個別電極パターン、共通電極パターン、発熱抵抗体を形
成してなるサーマルプリントヘッドにおいて、前記絶縁
基板と前記発熱抵抗体との界面部に前記個別電極及び前
記共通電極に直結しない独立した導体パターンを形成す
る。特に、前記独立した導体パターンを、所定値より抵
抗値の大きい前記発熱抵抗体部分と前記絶縁基板との界
面部に形成する。According to the present invention, there is provided a thermal printhead having an individual electrode pattern, a common electrode pattern, and a heating resistor formed on an insulating substrate, wherein an interface between the insulating substrate and the heating resistor is provided. Then, an independent conductor pattern not directly connected to the individual electrode and the common electrode is formed. In particular, the independent conductive pattern is formed at an interface between the heating resistor portion having a resistance value larger than a predetermined value and the insulating substrate.
【０００９】[0009]
【実施例】本発明の基本的な技術的思想は、発熱抵抗体
３の下層部に共通電極及び個別電極と直結しない電気的
に独立した導体パターン（以下、独立電極という）を形
成することを特徴とする。図１に示すように、この独立
電極４は、発熱抵抗体３の前記ダレ部分３ａ及び３ｂ、
つまり発熱損失部分の下層部に設ける。この独立電極４
の上に当たる部分の発熱抵抗体は、抵抗値がほぼ零とな
って感熱紙の発色に寄与しない。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The basic technical idea of the present invention is to form an electrically independent conductor pattern (hereinafter referred to as an independent electrode) which is not directly connected to a common electrode and an individual electrode in a lower layer portion of a heating resistor 3. Features. As shown in FIG. 1, the independent electrode 4 is provided with the sagged portions 3a and 3b of the heat generating resistor 3,
That is, it is provided in the lower layer portion of the heat loss portion. This independent electrode 4
The resistance value of the heating resistor in the portion corresponding to above does not contribute to the coloring of the thermal paper because the resistance value is almost zero.
【００１０】また、前記独立電極４と個別電極２、共通
電極１との間隙部分では電極間の長さが従来例よりも短
くなり、抵抗値も小さくなることによって、膜厚がダレ
により薄くなっていても抵抗値が小さくなるため、発熱
温度が高くなって感熱紙の発色に寄与する。以上によ
り、発熱抵抗体３の損失部分の電流損失を低減すること
ができ、発熱効率の向上が可能となる。In the gap between the independent electrodes 4 and the individual electrodes 2 and the common electrode 1, the length between the electrodes is shorter than in the conventional example, and the resistance value is also reduced. However, since the resistance value decreases, the heat generation temperature increases, which contributes to the color development of the thermal paper. As described above, the current loss in the loss portion of the heating resistor 3 can be reduced, and the heat generation efficiency can be improved.
【００１１】次に、前記独立電極４のパターン形成方法
について説明する。図１において、絶縁基板５上に金ペ
ーストを用いて導体電極を形成した後、エッチング法に
よって各個別電極２、共通電極１及び前記独立電極４を
同時にパターン形成する。前記独立電極４を同時に形成
するのは、エッチング法によりファインパターンが形成
できると同時に、他の電極と膜厚が同じになり、次工程
において発熱抵抗体３を印刷する際に、にじみ等の発生
が低く抑えられ良好な印刷性を得ることができるからで
ある。Next, a method for forming a pattern of the independent electrode 4 will be described. In FIG. 1, after a conductor electrode is formed using a gold paste on an insulating substrate 5, the individual electrodes 2, the common electrode 1, and the independent electrode 4 are simultaneously patterned by an etching method. Simultaneous formation of the independent electrodes 4 means that a fine pattern can be formed by an etching method, and at the same time, the film thickness becomes the same as the other electrodes. Is kept low, and good printability can be obtained.
【００１２】前記独立電極４の大きさは、図１に示すＬ
１＝２×Ｌ２、Ｌ４＝Ｌ５、Ｌ３＝Ｌ４×０．８程度の
大きさが好適である。また、独立電極４の大きさ、個別
電極２、共通電極１との間隙幅を変更することで、発熱
抵抗体３のダレ部の形状、膜厚に応じた最も発熱効率の
良い状態が得られる。次工程において発熱抵抗体３を印
刷するが、前記独立電極４の印刷位置に注意して形成し
た後、ガラスペーストによる保護膜８を印刷する。The size of the independent electrode 4 is L as shown in FIG.
A size of about 1 = 2 × L2, L4 = L5, L3 = L4 × 0.8 is preferable. Further, by changing the size of the independent electrode 4 and the width of the gap between the individual electrode 2 and the common electrode 1, a state with the highest heat generation efficiency can be obtained according to the shape and thickness of the sag portion of the heating resistor 3. . In the next step, the heating resistor 3 is printed. After the formation of the heating electrode 3 while paying attention to the printing position of the independent electrode 4, the protective film 8 made of glass paste is printed.
【００１３】[0013]
【発明の効果】本発明サーマルヘッドは、前記独立電極
パターンを形成することにより、図２の（Ｂ）に示す従
来の長円形６に対して、図２の（Ａ）に示すように長円
形から正方形６に近くなり、発色サイズが大きくなると
同時に発熱効率も向上するため、感熱紙の発色の濃さも
濃くなり、図３の（Ａ）で示すような面積の狭い隙７ａ
の印字状態が得られて印字品位も改善される。According to the thermal head of the present invention, by forming the independent electrode pattern, an oblong as shown in FIG. 3 and the heat generation efficiency is improved at the same time as the color generation size is increased. Therefore, the color depth of the thermal paper is also increased, and the gap 7a having a small area as shown in FIG.
And the print quality is improved.
【図１】本発明サーマルヘッドの要部平面図及び要部側
面図である。FIG. 1 is a plan view and a side view of a main part of a thermal head according to the present invention.
【図２】発熱抵抗体の発熱状態を示す図である。FIG. 2 is a diagram illustrating a heating state of a heating resistor.
【図３】感熱紙に印字した状態を示す図でる。FIG. 3 is a diagram showing a state in which printing is performed on thermal paper.
【図４】従来のサーマルヘッドの要部平面図及び要部側
面図である。FIG. 4 is a plan view and a side view of a main part of a conventional thermal head.
１ 共通電極 ２ 個別電極 ３ 発熱抵抗体 ３ａ、３ｂ 発熱抵抗体のダレ ４ 独立電極 ５ 絶縁基板 Reference Signs List 1 common electrode 2 individual electrode 3 heating resistor 3a, 3b sag of heating resistor 4 independent electrode 5 insulating substrate
Claims (2)
パターン、発熱抵抗体を形成し、前記絶縁基板と前記発
熱抵抗体との界面部に前記個別電極及び前記共通電極に
直結しない独立した導体パターンを形成してなるサーマ
ルプリントヘッドであって、 前記独立した導体パターンを前記発熱抵抗体の全幅の中
央部からそれぞれ３０％よりも外側で且つ前記個別電極
と前記共通電極との間にに設けたことを特徴とする サー
マルプリントヘッド。1. An independent conductor which is formed on an insulating substrate and has an individual electrode pattern, a common electrode pattern, and a heating resistor, and is not directly connected to the individual electrode and the common electrode at an interface between the insulating substrate and the heating resistor. A thermal print head having a pattern formed therein , wherein the independent conductor pattern is formed within a width of the heating resistor.
Each individual electrode outside 30% from the central part
A thermal printhead provided between the thermal printhead and the common electrode .
パターン、発熱抵抗体を形成し、前記絶縁基板と前記発
熱抵抗体との界面部に前記個別電極及び前記共通電極に
直結しない独立した導体パターンを形成してなるサーマ
ルプリントヘッドであって、 前記独立した導体パターンを、前記発熱抵抗体のダレ部
分の下層部で且つ前記個別電極と前記共通電極との間に
設けた ことを特徴とするサーマルプリントヘッド。2. An independent conductor which is formed on an insulating substrate and has an individual electrode pattern, a common electrode pattern, and a heating resistor, and is not directly connected to the individual electrode and the common electrode at an interface between the insulating substrate and the heating resistor. A thermal print head having a pattern formed thereon, wherein the independent conductor pattern is provided with a sag portion of the heating resistor.
And between the individual electrode and the common electrode.
Thermal printing head, characterized in that provided.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18000993A JP3320151B2 (en) | 1993-06-24 | 1993-06-24 | Thermal print head |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18000993A JP3320151B2 (en) | 1993-06-24 | 1993-06-24 | Thermal print head |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH07125281A JPH07125281A (en) | 1995-05-16 |
| JP3320151B2 true JP3320151B2 (en) | 2002-09-03 |
Family
ID=16075864
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP18000993A Expired - Fee Related JP3320151B2 (en) | 1993-06-24 | 1993-06-24 | Thermal print head |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3320151B2 (en) |
-
1993
- 1993-06-24 JP JP18000993A patent/JP3320151B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH07125281A (en) | 1995-05-16 |
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