JP3038944B2 - Thick film type thermal head - Google Patents
Thick film type thermal headInfo
- Publication number
- JP3038944B2 JP3038944B2 JP2764591A JP2764591A JP3038944B2 JP 3038944 B2 JP3038944 B2 JP 3038944B2 JP 2764591 A JP2764591 A JP 2764591A JP 2764591 A JP2764591 A JP 2764591A JP 3038944 B2 JP3038944 B2 JP 3038944B2
- Authority
- JP
- Japan
- Prior art keywords
- thermal head
- sub
- film type
- scanning direction
- heating resistor
- 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 - Lifetime
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Description
【０００１】[0001]
【産業上の利用分野】本発明は、個別対向型の厚膜型サ
ーマルヘッドに係り、特に昇華式プリンタ等の記録装置
の印字品質を向上させるための発熱抵抗体の構造を備え
た厚膜型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 an individual facing type thick film type thermal head, and more particularly to a thick film type thermal head having a heating resistor structure for improving the printing quality of a recording device such as a sublimation printer. Related to a thermal head.
【０００２】[0002]
【従来の技術】感熱方式プリンタやファクシミリ等の記
録装置の記録手段に用いられる記録ヘッドとしては、製
造の容易さから所謂厚膜型サーマルヘッドと呼ばれる記
録ヘッドが広く採用れている。感熱方式記録装置の一形
式として、インクドナーフィルムのインクを加熱昇華さ
せて記録媒体に画像や文字を形成する昇華式記録装置が
知られている。図５は厚膜型サーマルヘッドを印字ヘッ
ドとした昇華式記録装置の要部説明図であって、１はセ
ラミックス等の絶縁材料からなる基板、２は共通電極、
３は個別電極、４は発熱抵抗体、６は保護層であるオー
バーグレーズ層で、これらの構成層により厚膜型サーマ
ルヘッド１０が構成される。また、７はプラテン、８は
記録媒体、８０はインクドナーフィルムである。同図に
おいて、記録媒体８は記録時には厚膜型サーマルヘッド
１０とプラテン７との間に矢印Ｐ方向から挟持押圧され
てインクドナーフィルム８０の加熱により昇華した染料
が移転させられて記録が行なわれる。サーマルヘッドは
その電極の配置構造から分類して、共通電極と個別電極
とが副走査方向に対向配置された個別対向型サーマルヘ
ッドと、共通電極と個別電極とが主走査方向に櫛歯状に
配列された交互リード型サーマルヘッドとに大別され
る。2. Description of the Related Art As a recording head used in a recording device of a recording apparatus such as a thermal printer or a facsimile, a recording head called a so-called thick-film type thermal head is widely used because of its easy production. As one type of thermal recording apparatus, a sublimation recording apparatus that forms an image or a character on a recording medium by heating and sublimating the ink of an ink donor film is known. FIG. 5 is an explanatory view of a main part of a sublimation type recording apparatus using a thick film type thermal head as a print head, wherein 1 is a substrate made of an insulating material such as ceramics, 2 is a common electrode,
Reference numeral 3 denotes an individual electrode, 4 denotes a heating resistor, and 6 denotes an overglaze layer serving as a protective layer. These constituent layers constitute a thick-film type thermal head 10. Reference numeral 7 denotes a platen, 8 denotes a recording medium, and 80 denotes an ink donor film. In the drawing, the recording medium 8 is sandwiched and pressed between the thick film type thermal head 10 and the platen 7 in the direction of the arrow P during recording, and the dye sublimated by the heating of the ink donor film 80 is transferred to perform recording. . The thermal head is classified according to the electrode arrangement structure, and an individually opposed type thermal head in which a common electrode and an individual electrode are arranged facing each other in the sub-scanning direction, and a common electrode and the individual electrode are arranged in a comb shape in the main scanning direction. It is roughly divided into the arranged alternate read type thermal head.
【０００３】図６は従来技術による個別対向型の厚膜型
サーマルヘッドの構造を説明する要部平面図であって、
０１０は厚膜型サーマルヘッド、０１はセラミック基
板、０２は共通電極、０３は個別電極、０４は発熱抵抗
体、０６は保護層であるオーバーグレーズ層である。こ
の種の厚膜型サーマルヘッドは、電極層形成材料や発熱
体となる抵抗層形成材料をペースト状として印刷し、塗
布・焼成して所望の構成層を得るリフトオフ法により製
作される。図７は図６に示した厚膜型サーマルヘッドの
断面図で、（ａ）は図６のＡ−Ａ線に沿った副走査方向
断面を、（ｂ）は図６のＢ−Ｂ線に沿った主走査方向断
面を示す。同図（ａ）（ｂ）に示されたように、発熱抵
抗体０４は共通電極０２と個別電極０３を形成した上に
これら両電極の上部に橋絡して形成される。したがっ
て、この種のリフトオフ法により製作した個別対向型の
厚膜型サーマルヘッドは、発熱抵抗体０４の副走査方向
の断面形状が記録媒体方向に凸であるために、オーバー
グレーズ層０６も凸形状をなしている。なお、上記従来
の厚膜型サーマルヘッドを開示したものとしては、特開
平１−１２３７５６号公報，特開昭６４−４４７６２号
公報を挙げることができる。上記各公報に開示の厚膜型
サーマルヘッドは、発熱抵抗体の形状を主および副走査
の各方向の断面形状を矩形とすることによって発熱抵抗
体の発熱分布を均一とし、発熱抵抗体の平面形状の再現
性すなわちドット再現性を向上させたものである。しか
し、昇華式記録装置に好適な厚膜型サーマルヘッドの構
造については考慮されていない。FIG. 6 is a plan view of an essential part for explaining the structure of an individual opposed type thick film type thermal head according to the prior art.
010 is a thick film type thermal head, 01 is a ceramic substrate, 02 is a common electrode, 03 is an individual electrode, 04 is a heating resistor, and 06 is an overglaze layer which is a protective layer. This type of thick-film type thermal head is manufactured by a lift-off method in which a material for forming an electrode layer or a material for forming a resistance layer serving as a heating element is printed as a paste, applied and baked to obtain a desired constituent layer. 7A and 7B are cross-sectional views of the thick film type thermal head shown in FIG. 6, wherein FIG. 7A is a cross-sectional view in the sub-scanning direction along the line AA in FIG. 6, and FIG. 2 shows a cross section along the main scanning direction. As shown in FIGS. 3A and 3B, the heating resistor 04 is formed by forming a common electrode 02 and an individual electrode 03 and bridging over these two electrodes. Accordingly, in the individual facing type thick film type thermal head manufactured by this type of lift-off method, since the cross-sectional shape of the heating resistor 04 in the sub-scanning direction is convex in the recording medium direction, the overglaze layer 06 is also convex. Has made. Japanese Patent Application Laid-Open Nos. 1-123756 and 64-44762 can disclose the conventional thick film type thermal head. The thick-film type thermal head disclosed in each of the above publications has a uniform heating distribution of the heating resistor by making the shape of the heating resistor a rectangular cross section in each of the main scanning direction and the sub-scanning direction. The shape reproducibility, that is, dot reproducibility is improved. However, no consideration is given to the structure of a thick-film type thermal head suitable for a sublimation recording apparatus.
【０００４】[0004]
【発明が解決しようとする課題】従来のこの主の厚膜型
サーマルヘッドにおいては、共通電極０２と個別電極０
３の間隔Ｄと発熱抵抗体０４の副走査方向幅ｄとの寸法
に大きな差が無いため、共通電極０２と個別電極０３を
介して発熱抵抗体０４に通電すると、発熱抵抗体０４は
そのエッジまでの全長に亘って加熱される。そのため、
オーバーグレーズ層０６もそのエッジまでの凸部全体が
加熱されることになる。このサーマルヘッドの昇華式記
録装置に搭載して昇華式記録媒体に印字等の記録を行な
うと、発熱抵抗体上のオーバーグレーズ層の凸形状部分
全体が、発熱抵抗体の発熱と共に記録媒体８の表面を加
熱し、インクドナーフィルムの染料を昇華させる温度に
達する中央部分にインクの染料が移転されて記録がなさ
れることになる。In this conventional main thick-film type thermal head, the common electrode 02 and the individual electrodes 0 are used.
3 and the width d of the heating resistor 04 in the sub-scanning direction do not have a large difference. Therefore, when the heating resistor 04 is energized via the common electrode 02 and the individual electrode 03, the heating resistor 04 has its edge. Heated over its entire length. for that reason,
The entire protruding portion up to the edge of the overglaze layer 06 is also heated. When printing such as printing is performed on a sublimation type recording medium by mounting the thermal head on a sublimation type recording apparatus, the entire convex portion of the overglaze layer on the heating resistor is heated together with the heat generated by the heating resistor. The surface of the ink is heated, and the dye of the ink is transferred to a central portion where the temperature of the ink donor film reaches a temperature at which the dye is sublimated, whereby recording is performed.
【０００５】図８は個別対向型の厚膜型サーマルヘッド
を用いた記録状態を説明する模式図であって、従来は、
例えば１０ｄｏｔ／ｍｍのサーマルヘッドにおいて、発
熱抵抗体主走査幅を７０μｍ、また電極間幅１４０μｍ
に対し、発熱抵抗体副走査幅を従来は１７０μｍ程度と
している。この場合、発熱抵抗体突起（オーバーグレー
ズ層の突起）の圧痕そのものは該突起のエッジの形状を
転写した凹１１となり、その結果圧痕の周りは凸にな
る。また、１０ｄｏｔ／ｍｍで上記の発熱抵抗体サイズ
の場合、紙送り０．１ｍｍ／ｌｉｎｅであるから、７０
μｍの凹１１の重なり代が生じ、その重なり代で記録媒
体表面の凹凸が激しくなる。上記発熱抵抗体（オーバー
グレーズ層）のエッジの凸形状で記録媒体に圧痕がつく
のは、発熱抵抗体副走査方向端部のエッジまで、したが
ってオーバーグレーズ層のエッジまで熱が伝わり、昇華
式記録媒体表面の上記エッジが当たる領域はすべて変形
しやすくなるためである。すなわち、昇華式記録用の記
録媒体８の表面は熱により変形しやすい状態となるもの
であるため、上記のサーマルヘッドで印字すると、同図
（ａ）に示すように、記録媒体８の表面には厚膜型サー
マルヘッドの発熱抵抗体４のエッジしたがってこの発熱
抵抗体４のエッジとほぼ同一サイズのオーバーグレーズ
層６のエッジによる凸形状がそのまま凹部１１として転
写される。そして、上記凹部１１の中央部に昇華温度に
達して昇華したインクの染料９が移転する。染料９が移
転した記録媒体部分は、図示のごとく膨潤して僅かに凸
状となる。そして、次の記録動作で（ｂ）に示したよう
に先の記録で形成された凹部１１にさらに凹部１１が重
畳し、これが（ｃ）に示した如く次々に凹部１１と膨潤
部が形成される。このため、記録媒体８の表面に凹凸が
激しく発生してドット再現性が損なわれ、その結果画質
の劣化を招くという問題がある。FIG. 8 is a schematic view for explaining a recording state using an individual facing type thick film type thermal head.
For example, in a thermal head of 10 dots / mm, the main scanning width of the heating resistor is 70 μm, and the width between the electrodes is 140 μm.
On the other hand, the heating resistor sub-scanning width is conventionally set to about 170 μm. In this case, the indentation of the heating resistor projection (projection of the overglaze layer) itself becomes a recess 11 in which the shape of the edge of the projection is transferred, and as a result, the periphery of the indentation becomes convex. In the case of the above-mentioned heating resistor size of 10 dots / mm, since the paper feed is 0.1 mm / line, 70
An overlapping margin of the concave 11 of μm occurs, and the irregularity of the surface of the recording medium becomes severe at the overlapping margin. The indentation on the recording medium due to the convex shape of the edge of the heating resistor (overglaze layer) is due to the fact that heat is transmitted to the edge of the heating resistor in the sub-scanning direction end, and hence to the edge of the overglaze layer, and sublimation recording This is because all the areas of the medium surface that are hit by the edge are easily deformed. That is, since the surface of the recording medium 8 for sublimation recording tends to be easily deformed by heat, when printing is performed by the above-described thermal head, as shown in FIG. The convex shape due to the edge of the heating resistor 4 of the thick film type thermal head, that is, the edge of the overglaze layer 6 having substantially the same size as the edge of the heating resistor 4 is directly transferred as the concave portion 11. Then, the dye 9 of the ink, which has reached the sublimation temperature and sublimated, moves to the center of the concave portion 11. The recording medium portion to which the dye 9 has been transferred swells and becomes slightly convex as shown in the figure. Then, in the next recording operation, the concave portion 11 is further overlapped with the concave portion 11 formed by the previous recording as shown in (b), and the concave portion 11 and the swollen portion are successively formed as shown in (c). You. For this reason, the surface of the recording medium 8 has severe irregularities, and the dot reproducibility is impaired. As a result, there is a problem that the image quality is deteriorated.
【０００６】本発明の目的は、リフトオフ法による個別
対向型の厚膜型サーマルヘッドにおいて抵抗体副走査方
向端部のエッジ（すなわち、オーバーグレーズ層の副走
査方向エッジ）が発熱抵抗体の発熱の影響を受けないよ
うにすることによって、ドット再現性の良さを損なうこ
となく、昇華式記録装置で記録した記録媒体表面の凹凸
をなくし、画質を向上させることにある。An object of the present invention is to provide an individual facing type thick film type thermal head by a lift-off method, in which the edge of the resistor in the sub-scanning direction (that is, the edge of the overglaze layer in the sub-scanning direction) generates heat of the heating resistor. An object of the present invention is to improve the image quality by eliminating the unevenness on the surface of the recording medium recorded by the sublimation recording apparatus without deteriorating the dot reproducibility by not being affected.
【０００７】[0007]
【課題を解決するための手段】上記目的を達成するため
に、本発明は、共通電極（２）と、共通電極（２）に対
して互いに独立して対向し主走査方向に配置される複数
の個別電極（３）が形成された平板状の基板（１）上面
に、上記共通電極（２）および個別電極（３）のそれぞ
れに副走査方向に橋絡し且つリフトオフ法により形成さ
れた複数の発熱抵抗体（４）と、上記共通電極（２），
個別電極（３）および複数の各発熱抵抗体（４）を覆う
保護層（６）とが形成された厚膜型サーマルヘッドにお
いて、前記共通電極（２）と個別電極（３）との対向間
隔をＤとし、前記各発熱抵抗体（４）の副走査幅をｄと
したとき、 ２Ｄ ≦ ｄ としたことを特徴とする。In order to achieve the above object, the present invention provides a common electrode (2) and a plurality of common electrodes (2) arranged independently of each other and arranged in the main scanning direction. On the upper surface of the plate-like substrate (1) on which the individual electrodes (3) are formed, a plurality of bridges are formed in each of the common electrode (2) and the individual electrodes (3) in the sub-scanning direction and formed by a lift-off method. Of the heating resistor (4) and the common electrode (2),
In a thick-film type thermal head having an individual electrode (3) and a protective layer (6) covering a plurality of heating resistors (4), a facing distance between the common electrode (2) and the individual electrode (3). Is D, and when the sub-scanning width of each of the heating resistors (4) is d, 2D ≦ d.
【０００８】[0008]
【作用】発熱抵抗体（４）の副走査方向幅ｄを、この発
熱抵抗体が橋絡する共通電極（２）と個別電極（３）の
対向間隔Ｄの２倍以上とすることによって、発熱抵抗体
の中央部が記録ドットを形成するインクドナーフィルム
の染料が昇華する昇華温度に達しても、発熱抵抗体
（４）のエッジすなわちオーバーグレーズ層（６）のエ
ッジが記録媒体を加熱変形させる温度に達することがな
い。したがって、前記図８で説明したような画像の劣化
は発生しない。By setting the width d of the heating resistor (4) in the sub-scanning direction at least twice the facing distance D between the common electrode (2) and the individual electrode (3) which is bridged by the heating resistor, heat is generated. Even if the center of the resistor reaches the sublimation temperature at which the dye of the ink donor film forming the recording dots sublimates, the edge of the heating resistor (4), that is, the edge of the overglaze layer (6) heats and deforms the recording medium. Never reach temperature. Therefore, the image does not deteriorate as described with reference to FIG.
【０００９】[0009]
【実施例】以下、本発明の実施例につき、図面を参照し
て詳細に説明する。図１は本発明による厚膜型サーマル
ヘッドの一実施例を説明する要部平面図であって、１は
セラミック基板、２は共通電極、３は個別電極、４はリ
フトホフ法により形成された発熱抵抗体、６はオーバー
グレーズ層である。また、図２は図１に示した厚膜型サ
ーマルヘッドの断面図で、（ａ）は図１のＡ−Ａ線に沿
った副走査方向断面図、（ｂ）は図１のＢ−Ｂ線に沿っ
た断面図である。本発明の実施例は、発熱抵抗体副走査
幅を２１０μｍ、２８０μｍ、３５０μｍとして記録を
実行した結果、上記発熱抵抗体の副走査方向幅と、共通
電極と個別電極との間隔を特定比に選定したものであ
る。Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a plan view of an essential part for explaining an embodiment of a thick film type thermal head according to the present invention, wherein 1 is a ceramic substrate, 2 is a common electrode, 3 is an individual electrode, and 4 is a heat generated by a lift-off method. The resistor 6 is an overglaze layer. 2 is a cross-sectional view of the thick-film type thermal head shown in FIG. 1, (a) is a cross-sectional view in the sub-scanning direction along the line AA in FIG. 1, and (b) is a BB in FIG. It is sectional drawing along the line. In the embodiment of the present invention, as a result of performing printing with the heating resistor sub-scanning width set to 210 μm, 280 μm, and 350 μm, the width of the heating resistor in the sub-scanning direction and the distance between the common electrode and the individual electrode are selected at a specific ratio. It was done.
【００１０】図３は本実施例のサーマルヘッドで記録し
た記録媒体の（ａ）表面図と（ｂ）断面図であって、上
記電極間幅１４０μｍのサーマルヘッドにおいて発熱抵
抗体の副走査方向の幅を２８０μｍ以上すなわち電極間
幅の２倍以上としたものでは、同図に示すように、副走
査方向の発熱抵抗体４のエッジ（オーバーグレーズ層６
のエッジ）による圧痕（凹）が見られず、昇華染料移転
部９が若干膨潤した状態となる。そのため、記録媒体の
表面状態は従来技術のサーマルヘッドによるものに比較
して極めて平滑となり、良好な画質を提供できる。FIG. 3 shows (a) a surface view and (b) a cross-sectional view of a recording medium recorded by the thermal head of this embodiment. In the thermal head having a width between electrodes of 140 μm, the heating resistor in the sub-scanning direction is used. In the case where the width is 280 μm or more, that is, twice or more the width between the electrodes, as shown in the figure, the edge (overglaze layer 6
No indentation (concave) due to the edge of the sublimation dye is observed, and the sublimation dye transfer section 9 is slightly swollen. Therefore, the surface state of the recording medium becomes extremely smooth as compared with that of the conventional thermal head, and good image quality can be provided.
【００１１】図４は共通電極と個別電極の副走査方向の
幅（電極間隔）と発熱抵抗体の副走査方向の幅（抵抗体
幅）の比を変えて記録を行なった場合の記録媒体の表面
における熱分布の説明図である。同図において、上記電
極間隔をＤ，発熱抵抗体幅をｄとしたとき、（ａ）はｄ
＜２Ｄ，（ｂ）はｄ＝１．５Ｄ，（ｃ）はｄ＝２Ｄ，
（ｄ）はｄ＞２Ｄとしたサーマルヘッドの記録媒体の表
面での発熱温度分布を示す。なお、図中、Ｔは発熱温度
を、Ｔｏは記録媒体が熱変形を起こす臨界温度である。
すなわち、（ａ）のｄ＜２Ｄとしたサーマルヘッドでは
副走査方向の発熱抵抗体のエッジ（オーバーグレーズ層
のエッジ）の温度は臨界温度Ｔｏを大きく越えており、
記録媒体の表面は変形して圧痕（凹）が発生して記録媒
体の表面は凹凸が激しくなる。（ｂ）のｄ＝１．５Ｄと
したサーマルヘッドでは、上記（ａ）のサーマルヘッド
によるものよりも低い温度ではあるが、副走査方向の発
熱抵抗体のエッジ（オーバーグレーズ層のエッジ）の温
度は依然として臨界温度Ｔｏを大きく越え記録媒体の表
面は変形して圧痕（凹）が発生する。FIG. 4 shows a recording medium in which recording is performed by changing the ratio between the width of the common electrode and the individual electrode in the sub-scanning direction (electrode interval) and the width of the heating resistor in the sub-scanning direction (resistor width). It is explanatory drawing of the heat distribution on the surface. In the figure, when the above-mentioned electrode interval is D and the width of the heating resistor is d, (a) is d.
<2D, (b) d = 1.5D, (c) d = 2D,
(D) shows the heat generation temperature distribution on the surface of the recording medium of the thermal head where d> 2D. In the drawing, T is the heat generation temperature, and To is the critical temperature at which the recording medium undergoes thermal deformation.
That is, in the thermal head in which d <2D in (a), the temperature of the edge of the heating resistor (the edge of the overglaze layer) in the sub-scanning direction greatly exceeds the critical temperature To,
The surface of the recording medium is deformed to generate an indentation (concave), and the surface of the recording medium becomes extremely uneven. In the thermal head with d = 1.5D in (b), although the temperature is lower than that of the thermal head in (a), the temperature of the edge of the heating resistor (the edge of the overglaze layer) in the sub-scanning direction. Still greatly exceeds the critical temperature To, the surface of the recording medium is deformed, and an indentation (concave) is generated.
【００１２】しかるに、（ｃ）のｄ＝２Ｄとしたサーマ
ルヘッドでは副走査方向の発熱抵抗体のエッジ（オーバ
ーグレーズ層のエッジ）の温度は臨界温度Ｔｏと略々同
等のものとなり、周囲の温度や湿度，記録装置の稼働時
間などの条件によっては若干の圧痕が発生する場合もあ
るが、記録媒体は略平滑な表面状態を保つ。そして、
（ｄ）のｄ＞２Ｄとしたサーマルヘッドでは副走査方向
の発熱抵抗体のエッジ（オーバーグレーズ層のエッジ）
の温度は臨界温度Ｔｏ以下となるため、記録媒体の表面
に圧痕が発生することはない。すなわち、抵抗体副走査
幅ｄが電極間幅Ｄの２倍以上のものは、副走査方向端部
のエッジが、昇華式記録媒体の表面に変形を与えるに至
る温度まで加熱されるまでには到らない。なお、上記実
施例は、個別対向型の厚膜型サーマルヘッドに本発明を
適用したものであるが、本発明はこれに限定されるもの
ではなく、交互リード型の厚膜型サーマルヘッドにおい
てその共通電極と個別電極との副走査方向対向部の長さ
を上記実施例における電極間隔Ｄに置き換えて実施する
ことも可能である。また、インクリボンと普通紙を使用
するインク溶着転写型感熱式記録装置に用いられる厚膜
型サーマルヘッドに本発明を適用することにより、発熱
抵抗体の副走査方向サイズより小さいサイズの記録ドッ
トを得る記録装置を提供することもできる。However, in the thermal head in which (c) d = 2D, the temperature of the edge of the heating resistor (the edge of the overglaze layer) in the sub-scanning direction is substantially equal to the critical temperature To, and the ambient temperature Depending on conditions such as humidity, humidity, and operating time of the recording apparatus, slight indentation may occur, but the recording medium maintains a substantially smooth surface state. And
(D) In the thermal head where d> 2D, the edge of the heating resistor in the sub-scanning direction (the edge of the overglaze layer)
Is below the critical temperature To, so that no indentation occurs on the surface of the recording medium. That is, when the resistor sub-scanning width d is twice or more the interelectrode width D, the edge at the sub-scanning direction end is heated to a temperature at which the surface of the sublimation recording medium is deformed. I do not reach. In the above embodiment, the present invention is applied to an individually opposed type thick film type thermal head. However, the present invention is not limited to this, and the present invention is applied to an alternate lead type thick film type thermal head. It is also possible to replace the length of the common electrode and the individual electrode in the sub-scanning direction with the length D of the electrode in the above embodiment. Further, by applying the present invention to a thick film type thermal head used in an ink fusion transfer type thermal recording device using an ink ribbon and plain paper, recording dots smaller in size in the sub-scanning direction of the heating resistor can be formed. A recording device can also be provided.
【００１３】[0013]
【発明の効果】以上説明したように、本発明によれば、
副走査方向における発熱抵抗体副走査幅ｄを電極間幅Ｄ
の２倍以上としたことによって、副走査方向の発熱抵抗
体エッジ部すなわちオーバーグレーズ層のエッジ部が記
録媒体の変形をもたらす温度にならないため、昇華方式
の厚膜型サーマルヘッドとして用いたときの記録媒体の
表面状態を略平滑に保ち、良好な画質の記録を行なうこ
とができる。As described above, according to the present invention,
The heating resistor sub-scanning width d in the sub-scanning direction is set to the interelectrode width D.
Is twice or more, the edge of the heating resistor in the sub-scanning direction, that is, the edge of the overglaze layer does not reach a temperature at which the recording medium is deformed. The surface state of the recording medium can be kept substantially smooth, and recording with good image quality can be performed.
【図１】本発明による厚膜型サーマルヘッドの一実施例
を説明する要部平面図である。FIG. 1 is a plan view of an essential part for explaining an embodiment of a thick film type thermal head according to the present invention.
【図２】本発明による厚膜型サーマルヘッドの一実施例
を説明する図１の断面図である。FIG. 2 is a cross-sectional view of FIG. 1 illustrating an embodiment of a thick film type thermal head according to the present invention.
【図３】本発明の一実施例のサーマルヘッドで記録した
記録媒体の（ａ）表面図と（ｂ）断面図である。3A and 3B are a front view and a cross-sectional view of a recording medium recorded by a thermal head according to an embodiment of the present invention.
【図４】厚膜型サーマルヘッドの共通電極と個別電極の
副走査方向の幅（電極間隔）と抵抗体の副走査方向の幅
（抵抗体幅）の比を変えて記録を行なった場合の記録媒
体の表面における熱分布の説明図である。FIG. 4 shows a case where recording is performed by changing the ratio of the width of the common electrode and the individual electrode of the thick film type thermal head in the sub-scanning direction (electrode interval) to the width of the resistor in the sub-scanning direction (resistance body width). FIG. 3 is an explanatory diagram of a heat distribution on a surface of a recording medium.
【図５】厚膜型サーマルヘッドを印字ヘッドとした昇華
式記録装置の要部説明図である。FIG. 5 is an explanatory view of a main part of a sublimation type recording apparatus using a thick film type thermal head as a print head.
【図６】従来技術による個別対向型の厚膜型サーマルヘ
ッドの構造を説明する要部平面図である。FIG. 6 is a plan view of a principal part for explaining the structure of an individual facing type thick film type thermal head according to the related art.
【図７】従来技術による個別対向型の厚膜型サーマルヘ
ッドの構造を説明する図６のＡ−Ａ線に沿った副走査方
向断面とＢ−Ｂ線に沿った主走査方向断面である。7A and 7B are a cross-sectional view in the sub-scanning direction along line AA and a cross-section in the main scanning direction along line BB in FIG. 6 for explaining the structure of the conventional individually opposed thick film type thermal head.
【図８】従来技術による個別対向型の厚膜型サーマルヘ
ッドを用いた記録状態を微視的に示した模式図である。FIG. 8 is a schematic diagram microscopically showing a recording state using an individual facing type thick film type thermal head according to the related art.
１ セラミック基板 ２ 共通電極 ３ 個別電極 ４ 発熱抵抗体 ６ オーバーグレーズ（保護層） Reference Signs List 1 ceramic substrate 2 common electrode 3 individual electrode 4 heating resistor 6 overglaze (protective layer)
フロントページの続き (56)参考文献 特開 昭60−58876（ＪＰ，Ａ) 特開 平２−276652（ＪＰ，Ａ) 実開 平２−144443（ＪＰ，Ｕ) 実開 平１−110928（ＪＰ，Ｕ) (58)調査した分野(Int.Cl.7，ＤＢ名) B41J 2/345 Continuation of the front page (56) References JP-A-60-58876 (JP, A) JP-A-2-276652 (JP, A) JP-A 2-144443 (JP, U) JP-A 1-110928 (JP) , U) (58) Field surveyed (Int. Cl. 7 , DB name) B41J 2/345
Claims (1)
立して対向し主走査方向に配置される複数の個別電極が
形成された平板状の基板上面に、上記共通電極および個
別電極のそれぞれに副走査方向に橋絡し且つリフトオフ
法により形成された複数の発熱抵抗体と、上記共通電
極，個別電極および複数の各発熱抵抗体を覆う保護層と
が形成された厚膜型サーマルヘッドにおいて、 前記共通電極と個別電極との対向間隔をＤとし、前記各
発熱抵抗体の副走査幅をｄとしたとき、 ２Ｄ ≦ ｄ としたことを特徴とする厚膜型サーマルヘッド。1. A common electrode and a plurality of individual electrodes which are opposed to the common electrode independently from each other and are arranged in a main scanning direction are formed on an upper surface of a plate-shaped substrate. A thick film type thermal head in which a plurality of heating resistors bridged in the sub-scanning direction and formed by a lift-off method, and a protective layer covering the common electrode, the individual electrodes and the plurality of heating resistors are formed. 2D ≦ d, where D is the distance between the common electrode and the individual electrode facing each other, and d is the sub-scanning width of each heating resistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2764591A JP3038944B2 (en) | 1991-01-30 | 1991-01-30 | Thick film type thermal head |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2764591A JP3038944B2 (en) | 1991-01-30 | 1991-01-30 | Thick film type thermal head |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04305467A JPH04305467A (en) | 1992-10-28 |
| JP3038944B2 true JP3038944B2 (en) | 2000-05-08 |
Family
ID=12226665
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2764591A Expired - Lifetime JP3038944B2 (en) | 1991-01-30 | 1991-01-30 | Thick film type thermal head |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3038944B2 (en) |
-
1991
- 1991-01-30 JP JP2764591A patent/JP3038944B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH04305467A (en) | 1992-10-28 |
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