JPH01215559A - Thermal head - Google Patents
Thermal headInfo
- Publication number
- JPH01215559A JPH01215559A JP63041224A JP4122488A JPH01215559A JP H01215559 A JPH01215559 A JP H01215559A JP 63041224 A JP63041224 A JP 63041224A JP 4122488 A JP4122488 A JP 4122488A JP H01215559 A JPH01215559 A JP H01215559A
- Authority
- JP
- Japan
- Prior art keywords
- thermal head
- recording medium
- thermal
- heating part
- platen
- 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
- 238000009826 distribution Methods 0.000 abstract description 8
- 238000007639 printing Methods 0.000 abstract description 8
- 230000001681 protective effect Effects 0.000 abstract description 8
- 238000010438 heat treatment Methods 0.000 abstract description 6
- 238000003825 pressing Methods 0.000 abstract description 3
- 238000000034 method Methods 0.000 abstract description 2
- 239000000758 substrate Substances 0.000 description 6
- 238000005338 heat storage Methods 0.000 description 5
- 239000004642 Polyimide Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 229920001721 polyimide Polymers 0.000 description 2
- 239000000919 ceramic Substances 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 229920006015 heat resistant resin Polymers 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/315—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of heat to a heat sensitive printing or impression-transfer material
- B41J2/32—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of heat to a heat sensitive printing or impression-transfer material using thermal heads
Landscapes
- Electronic Switches (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は感熱記録に用いられるサーマルへラドに関する
ものである。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a thermal helad used for heat-sensitive recording.
従来のサーマルヘッドは、第２図に示すように、基板（
１）上に蓄熱層（２）、抵抗体（３）、−対の電極（４
）、保護膜（５）を順次積層して形成され、一対の電極
（４）の間に通電すると、抵抗体（３）のうちその上に
電極のない部分でジュール熱が発生し、その上部がサー
マルヘッドの発熱部（６）となっていた。The conventional thermal head has a substrate (
1) A heat storage layer (2), a resistor (3), and a pair of electrodes (4) on top.
), the protective film (5) is sequentially laminated, and when electricity is applied between the pair of electrodes (4), Joule heat is generated in the part of the resistor (3) where there is no electrode on it, and the upper part of the resistor (3) generates Joule heat. was the heat generating part (6) of the thermal head.
しかし、このようなサーマルヘッドは、肝心の発熱部（
６）が電極（４）の厚さ分だけ周囲よりへこんでいるの
で、ここへプラテンで記録媒体を押しつけたとき、熱的
な接触が悪く印画品質が低下したり、熱効率が低下する
問題があった。However, such a thermal head does not have the essential heat generating part (
6) is recessed from the surrounding area by the thickness of the electrode (4), so when a recording medium is pressed against it with a platen, there is a problem that thermal contact is poor and print quality deteriorates and thermal efficiency decreases. Ta.
そこで、第３図のような、ポリイミド等の耐熱性樹脂か
ら成る蓄熱層（２）を部分的に形成して、発熱部（６）
のみを周囲より突出させたサーマルヘッドが提案された
（特開昭６１−２９００６７号公報参照）。Therefore, as shown in Fig. 3, a heat storage layer (2) made of a heat-resistant resin such as polyimide is partially formed, and the heat generating part (6)
A thermal head in which only one portion of the thermal head protrudes from the surrounding area has been proposed (see Japanese Patent Laid-Open No. 61-290067).
しかしながら、長いこと使用すると、突出した発熱部の
記録媒体の送られて来る側の端部にクランクが生じ、や
がて保護膜が剥離してしまうという問題点があった。However, when used for a long time, a problem arises in that a crank develops at the end of the protruding heat generating section on the side from which the recording medium is fed, and the protective film eventually peels off.
本発明の目的は、発熱部を突出させて印画品質と熱効率
を向上させても耐久性の低下しないサーマルヘッドを提
供することにある。SUMMARY OF THE INVENTION An object of the present invention is to provide a thermal head whose durability does not deteriorate even when the heat generating portion is made to protrude to improve printing quality and thermal efficiency.
上記問題点の解決の為に、本発明は、第１図に示すよう
に、周囲より突出した発熱部（６）の表面を記録媒体の
搬送されて来る方向に対面するように傾けたものである
。In order to solve the above-mentioned problems, the present invention, as shown in FIG. be.
感熱記録では、第４図に示すように、サーマルヘッドの
発熱部（６）に、記録媒体（８）をプラテン（９）と呼
ばれるゴム製のローラーで押しつけ、このプラテン（９
）を回転させることによって記録媒体（８）を搬送しな
がら、サーマルヘッド（７）の抵抗体を選択的に発熱さ
せて記録を行う、記録媒体（８）とは、感熱紙に限るこ
となく、インクシートとレシーバ−（受像シート）との
組合せも含まれる。In thermal recording, as shown in FIG.
The recording medium (8) that performs recording by selectively generating heat in the resistor of the thermal head (7) while conveying the recording medium (8) by rotating the recording medium (8) is not limited to thermal paper. A combination of an ink sheet and a receiver (image receiving sheet) is also included.
記録媒体（８）の搬送は、発熱時は停止させて非発熱時
に搬送する方法（間欠駆動）と、連続して搬送する方法
（連続駆動）とがあるが、いずれの場合もプラテンをサ
ーマルヘッド（７）に押しつけたままの状態で搬送を行
う、そのため、プラテン（９）は記録媒体（８）を介し
てサーマルへラド（７）から搬送方向と逆方向の摩擦力
を受けて弾性変形する。プラテン（９）の水平方向（搬
送方向と平行）に圧縮された部分は、それと垂直方向に
伸びようとして圧力を生じるので、その結果、第５図に
示すように、プリント中の発熱部上の押しつけ圧力の分
布は静止したプラテンを押しつけた場合とは異り、記録
媒体の搬送されて来る側の方が圧力が高くなる。There are two ways to transport the recording medium (8): one method is to stop the recording medium when it generates heat and transport it when no heat is generated (intermittent drive), and the other is to transport it continuously (continuous drive). In both cases, the platen is moved by the thermal head. The platen (9) is conveyed while being pressed against the recording medium (8), so that the platen (9) is elastically deformed by receiving frictional force in the direction opposite to the conveyance direction from the thermal pad (7) via the recording medium (8). . The portion of the platen (9) compressed in the horizontal direction (parallel to the conveying direction) tries to expand in the vertical direction and generates pressure. As a result, as shown in Figure 5, The distribution of the pressing pressure is different from that when a stationary platen is pressed, and the pressure is higher on the side where the recording medium is being conveyed.
その為、記録媒体の送られて来る側の端部に圧力が集中
し、その部分の保護膜にクラック等が発生する問題が生
じていた。As a result, pressure concentrates on the end of the recording medium from which it is fed, creating a problem in which cracks or the like occur in the protective film in that area.
本発明においては、突出した発熱部の表面を記録媒体の
送られて来る側に対面するように傾けた。In the present invention, the surface of the protruding heat generating portion is inclined so as to face the side from which the recording medium is fed.
そのため、発熱部上の押しつけ圧力分布は、第６図に示
すように、静止したプラテンの場合は一様でないが、プ
リント中には一様になる。このように圧力分布が一様な
ので従来のものと比べてより強い圧力でプラテンを発熱
部に押しつけてもプリント中に保ｉｔｓにクラックを生
しることがなくなり、熱接触がより確実になるとともに
、耐久性が向上する。Therefore, as shown in FIG. 6, the pressing pressure distribution on the heat generating part is not uniform when the platen is stationary, but becomes uniform during printing. Since the pressure distribution is uniform in this way, even if the platen is pressed against the heat generating part with stronger pressure compared to conventional models, there will be no cracks in the heat generating part during printing, and the thermal contact will be more reliable. , durability is improved.
以下に、第７図を引用して本発明の詳細な説明する。第
７図は副走査方向に平行な垂直面で切断して得られる概
略断面図である。The present invention will be described in detail below with reference to FIG. FIG. 7 is a schematic cross-sectional view obtained by cutting along a vertical plane parallel to the sub-scanning direction.
まず、第７図（ａ）に示すようにＡＮ製の基板（１）の
表面を加工して表面の傾いた一本の突出部（１０）を形
成した。First, as shown in FIG. 7(a), the surface of a substrate (1) made of AN was processed to form a protrusion (10) with an inclined surface.
次に、この上にポリイミドワンスをスピナーで塗布し、
熱硬化させて第７図（ｂ）のように蓄熱層（２）を形成
した。Next, apply polyimide once on top of this using a spinner.
It was thermally cured to form a heat storage layer (2) as shown in FIG. 7(b).
この上にＴＴａ−５ｌｏから成る抵抗体（３）、Ｃｒ／
Ａｊ！の２層膜から成る電極（４）、３１０ｚ／Ｔａｔ
Ｏｓの２層膜から成る保護膜（５）を順次形成して、第
７図（ｃ）に示す発熱部（６）の表面が傾いたサーマル
ヘッドを作成した。On top of this, a resistor (3) made of TTa-5lo, Cr/
Aj! Electrode (4) consisting of a two-layer film of 310z/Tat
A protective film (5) consisting of a two-layer film of Os was sequentially formed to produce a thermal head with an inclined surface of a heat generating part (6) shown in FIG. 7(c).
このサーマルヘッドでプリント実験を行ったところ、従
来のものと比べて印画品質、熱効率ともに向上し、長い
ことプリントしても保護膜（５）にクラックを生じるこ
ともなかった。When we conducted printing experiments using this thermal head, we found that both the printing quality and thermal efficiency were improved compared to conventional ones, and the protective film (5) did not develop any cracks even after printing for a long time.
なお、本実施例では、Ａ２基板を用いたが、従来から使
われているＡｌｔｏｓ等のセラミクス基板を用いてもよ
い、また、第１図のように平坦な基板上に表面が傾いた
蓄熱層（２）の突出部を形成してもよい。In this example, an A2 substrate was used, but a conventionally used ceramic substrate such as Altos may also be used.Also, a heat storage layer with an inclined surface on a flat substrate as shown in Fig. 1 may be used. The protruding portion (2) may also be formed.
以上のように、本発明によれば、突出した発熱部を記録
媒体が送られて来る側に対面させ、記録時のプラテンに
よる圧力分布を一様にしたので、圧力集中による保護膜
の破壊が生ぜず、耐久性が飛躍的に向上する。また、そ
のため、より高い圧力を加えることもできるようになり
、より確実な熱接触が得られ、それゆえ熱効率も向上す
るなどの利点も得られる。As described above, according to the present invention, the protruding heat generating part is made to face the side from which the recording medium is fed, and the pressure distribution by the platen during recording is made uniform, so that the destruction of the protective film due to pressure concentration is prevented. The durability is dramatically improved. This also provides advantages such as higher pressure can be applied, more reliable thermal contact is achieved, and therefore thermal efficiency is improved.
第１図は、本発明の一実施例にかかるサーマルヘッドの
概略断面図である。
第２図は、従来の発熱部を突出させないサーマルヘッド
の概略断面図である。
第３図は、従来の発熱部を突出させたサーマルヘッドの
概略断面図である。
第４図は、感熱記録の概念図である。
第５図は、従来の発熱部を突出させたサーマルヘッドで
の発熱部上の圧力分布を示すグラフである。
第６図は、本発明によるサーマルヘッドでの発熱部上の
圧力分布を示すグラフである。
第７図（ａ）〜（Ｃ）は、本発明の実施例にかかるサー
マルヘッドの各製造工程を示す断面図である。
〔主要部分の符号の説明〕
１・・・基板、２・・・蓄熱層、３・・・抵抗体、４・
・・電極、５・・・保護膜、６・・・発熱部、７・・・
サーマルへラド、８・・・記録媒体、９・・・プラテン
、１０・・・突出部。
出願人 日本光学工業株式会社FIG. 1 is a schematic cross-sectional view of a thermal head according to an embodiment of the present invention. FIG. 2 is a schematic cross-sectional view of a conventional thermal head in which the heat generating part does not protrude. FIG. 3 is a schematic cross-sectional view of a conventional thermal head with a protruding heat generating part. FIG. 4 is a conceptual diagram of thermosensitive recording. FIG. 5 is a graph showing the pressure distribution on the heat generating part in a conventional thermal head with the heat generating part protruding. FIG. 6 is a graph showing the pressure distribution on the heat generating part of the thermal head according to the present invention. FIGS. 7(a) to 7(C) are cross-sectional views showing each manufacturing process of a thermal head according to an embodiment of the present invention. [Explanation of symbols of main parts] 1...Substrate, 2...Heat storage layer, 3...Resistor, 4...
...Electrode, 5...Protective film, 6...Heating part, 7...
Thermal disk, 8... Recording medium, 9... Platen, 10... Projection. Applicant Nippon Kogaku Kogyo Co., Ltd.
Claims (1)
表面を記録媒体の搬送方向に対面するように傾けたこと
を特徴とするサーマルヘッド。1. A thermal head having a protruding heat generating part, characterized in that the surface of the heat generating part is inclined so as to face the conveyance direction of a recording medium.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63041224A JPH01215559A (en) | 1988-02-24 | 1988-02-24 | Thermal head |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63041224A JPH01215559A (en) | 1988-02-24 | 1988-02-24 | Thermal head |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01215559A true JPH01215559A (en) | 1989-08-29 |
Family
ID=12602434
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63041224A Pending JPH01215559A (en) | 1988-02-24 | 1988-02-24 | Thermal head |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01215559A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009107201A (en) * | 2007-10-30 | 2009-05-21 | Kyocera Corp | Thermal head, manufacturing method for thermal head, and thermal printer |
-
1988
- 1988-02-24 JP JP63041224A patent/JPH01215559A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009107201A (en) * | 2007-10-30 | 2009-05-21 | Kyocera Corp | Thermal head, manufacturing method for thermal head, and thermal printer |
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