JPH01209160A - Thermal head - Google Patents
Thermal headInfo
- Publication number
- JPH01209160A JPH01209160A JP3570188A JP3570188A JPH01209160A JP H01209160 A JPH01209160 A JP H01209160A JP 3570188 A JP3570188 A JP 3570188A JP 3570188 A JP3570188 A JP 3570188A JP H01209160 A JPH01209160 A JP H01209160A
- Authority
- JP
- Japan
- Prior art keywords
- heat generating
- heat
- parts
- electrode
- resistors
- 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
- 239000000758 substrate Substances 0.000 claims abstract description 9
- 238000010438 heat treatment Methods 0.000 claims description 25
- 238000007639 printing Methods 0.000 abstract description 17
- 239000011521 glass Substances 0.000 abstract description 7
- 239000004020 conductor Substances 0.000 abstract description 3
- 238000005299 abrasion Methods 0.000 abstract 3
- 230000020169 heat generation Effects 0.000 description 6
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 3
- 238000004040 coloring Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- WOCIAKWEIIZHES-UHFFFAOYSA-N ruthenium(iv) oxide Chemical compound O=[Ru]=O WOCIAKWEIIZHES-UHFFFAOYSA-N 0.000 description 2
- 238000009966 trimming Methods 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000005498 polishing Methods 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
- B41J2/335—Structure of thermal heads
Landscapes
- Electronic Switches (AREA)
Abstract
Description
【発明の詳細な説明】
産業上の利用分野
本発明はプリンタやファクシミリ等の感熱記録装置に用
いられるサーマルヘッドに関する。DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a thermal head used in a thermal recording device such as a printer or facsimile.
従来の技術
プリンタやファクシミリ等の感熱記録装置は、サーマル
ヘッドを用い、感熱紙あるいはインクシートと重ね合わ
せた普通紙に対して感熱記録を行っている。感熱記録時
の記録濃度は感熱紙あるいはインクシートに伝わる熱量
によって決るものであり、サーマルヘッドの発熱抵抗体
の単位体積当りの発熱量が一定で、かつ、該発熱抵抗体
および耐摩耗層が均一であることが必要である。2. Description of the Related Art Conventional thermal recording devices such as printers and facsimiles use thermal heads to perform thermal recording on thermal paper or plain paper overlaid with an ink sheet. The recording density during thermal recording is determined by the amount of heat transferred to the thermal paper or ink sheet, and the heat generation amount per unit volume of the heating resistor of the thermal head is constant, and the heating resistor and the wear-resistant layer are uniform. It is necessary that
従来の厚膜型サーマルヘッドは、アルミナ基板の上面に
グレーズ層を形成し、この基板上に共通電極、個別電極
、発熱抵抗体を形成し、さらに、耐摩耗層を発熱抵抗体
と導体電極の一部を覆うように構成している。Conventional thick-film thermal heads have a glaze layer formed on the top surface of an alumina substrate, a common electrode, individual electrodes, and a heating resistor formed on this substrate, and a wear-resistant layer between the heating resistor and conductor electrode. It is configured to partially cover the area.
第５図は従来の厚膜型サーマルヘッドの発熱抵抗体部の
断面の拡大図である。FIG. 5 is an enlarged cross-sectional view of a heating resistor portion of a conventional thick-film thermal head.
共通電極と個別電極問にパルス的に電圧を印加すると、
発熱抵抗体に電流が流れ３００〜４５０℃の高温に発熱
し、電力の印加の中止とともに室温付近まで冷却され、
この繰り返しにより感熱記録を可能にしている。均一な
高品位印字の観点からは、発熱抵抗体の各ドツト当りの
抵抗値が一定でドツト当りの発熱量を一定とし、かつ、
発熱抵抗体および耐摩耗層を均一に形成することで感熱
紙に一定の熱量が熱伝導することが要求される。When voltage is applied in pulses between the common electrode and the individual electrodes,
Current flows through the heating resistor, generating heat at a high temperature of 300 to 450°C, and when the application of power is stopped, it cools down to around room temperature.
This repetition makes thermosensitive recording possible. From the viewpoint of uniform high-quality printing, the resistance value of each dot of the heating resistor should be constant and the amount of heat generated per dot should be constant, and
It is required that a certain amount of heat be conducted to the thermal paper by uniformly forming the heating resistor and the wear-resistant layer.
しかし、従来の厚膜型のサーマルヘッドでは、発熱体抵
抗体５もしくは耐摩耗層６の形状は印刷技術および材料
と焼成温度によるところが大きく、１ドツト当たり一定
の体積に形成することが難しく、また、一般にその表面
は凹凸が多く、そのため、発熱抵抗体の各ドツト当りの
抵抗値をトリミングして一定に合わせても感熱紙に一定
の熱量を熱伝導することが困難であった。However, in conventional thick-film thermal heads, the shape of the heating element resistor 5 or the wear-resistant layer 6 largely depends on the printing technology, material, and firing temperature, and it is difficult to form each dot to a constant volume. Generally, the surface of the heating resistor has many irregularities, and therefore, even if the resistance value of each dot of the heating resistor is trimmed to a constant value, it is difficult to conduct a constant amount of heat to the thermal paper.
発明が解決しようとする課題
サーマルヘッドにおける印字濃度ムラを改善し、かつ、
発熱効率の向上を計り熱応答性を高め、省電力化を可能
とする。Problem to be Solved by the Invention It is an object of the present invention to improve print density unevenness in a thermal head, and
It aims to improve heat generation efficiency and enhance thermal response, making it possible to save power.
課題を解決するための手段
本発明の特徴は、発熱抵抗体もしくは耐摩耗層の上部を
部分的に平坦にしたことにある。Means for Solving the Problems The present invention is characterized in that the upper part of the heating resistor or the wear-resistant layer is partially flattened.
作用
本発明はｆｆｉサーマルヘッドにおける印字濃度ムラが
単に発熱抵抗体の抵抗値ばらつきに起因するものでなく
、発熱抵抗体および耐摩耗層の形状にも大きく作用され
ることを見いだしたことによる。本発明の構成によれば
、発熱抵抗体および耐摩耗層の上部を均一に形成するこ
とで感熱紙に一定の熱量を熱伝導することにより印字濃
度ムラを改善し、かつ、感熱紙と接触する部分が平坦で
あるため紙と発熱部との当りを良くすることにより発熱
効率、熱応答性を向上することが可能で、高速に高品位
印字可能なサーマルヘッドを提供することができる。The present invention is based on the discovery that uneven print density in an FFI thermal head is not simply caused by variations in the resistance value of the heating resistor, but is also greatly influenced by the shapes of the heating resistor and the wear-resistant layer. According to the configuration of the present invention, by uniformly forming the upper part of the heating resistor and the wear-resistant layer, a certain amount of heat is thermally conducted to the thermal paper, thereby improving print density unevenness, and making contact with the thermal paper. Since the portion is flat, it is possible to improve the heat generation efficiency and thermal response by improving the contact between the paper and the heat generating part, and it is possible to provide a thermal head capable of high-speed, high-quality printing.
実施例
（１）第１図は本発明の一実施例のサーマルヘッドを説
明するための断面構成図であり第２図は電極構成を示す
平面図である。また、第３図は発熱体部分の拡大図であ
る。図に示す様に、グレーズ層２を設けてなるアルミナ
基板１上に金の導電体電極（厚みｏ、５−ｉ−ｏμｍ）
からなる共通電極３および個別電極４をドツトピッチ（
１６７μｍ）の間隔て設けた。つぎに、前記電極群の対
向部上にＲｕＯ２を主成分とする発熱用の抵抗体（厚み
４−８μｍ）５をライン状に印刷焼成し、つぎに該抵抗
体および電極群の一部を覆うようにガラス層を印刷焼成
した。Embodiment (1) FIG. 1 is a cross-sectional configuration diagram for explaining a thermal head according to an embodiment of the present invention, and FIG. 2 is a plan view showing the electrode configuration. Moreover, FIG. 3 is an enlarged view of the heating element portion. As shown in the figure, a gold conductor electrode (thickness o, 5-i-o μm) is placed on an alumina substrate 1 provided with a glaze layer 2.
A common electrode 3 and individual electrodes 4 are arranged at a dot pitch (
167 μm). Next, a heating resistor (thickness: 4-8 μm) 5 containing RuO2 as a main component is printed and fired in a line on the opposing part of the electrode group, and then the resistor and a part of the electrode group are covered. The glass layer was printed and fired.
次に、発熱抵抗体上の凸部のガラス層の表面を研磨紙を
用いて１−２μｍ程度研磨することにより凸部の上部を
平坦にした耐摩耗層７（厚み４−８μｍ）を形成した。Next, the surface of the glass layer of the convex part on the heating resistor was polished by about 1-2 μm using abrasive paper, thereby forming a wear-resistant layer 7 (4-8 μm thick) with a flattened upper part of the convex part. .
つぎに、発熱抵抗体の自己発生ジュール熱により抵抗値
を調整する通電過負荷トリミング法を用いて、対向する
一対の共通電極１ｏおよび個別電極１１との電極閏に形
成されるそれぞれの発熱部にパルス電圧（５−１５０Ｖ
、数μｓ）を任意の時間通電することにより、各発熱部
の抵抗値を別々に調整し、全発熱部の抵抗値を１０００
Ω±１％以内にそろえた。Next, using the current overload trimming method that adjusts the resistance value using self-generated Joule heat of the heat generating resistor, each heat generating part formed at the electrode interlock between the pair of opposing common electrodes 1o and individual electrodes 11 is applied. Pulse voltage (5-150V
, several μs) for an arbitrary period of time, the resistance value of each heat generating part is adjusted separately, and the resistance value of all heat generating parts is adjusted to 1000.
Aligned within Ω±1%.
このヘッドを０．１２Ｗ／ｄｏｔ、 ｌ／４ｄｕｔｙ、
３２ｎ＋ｓ／ｃｙｃｌｅの条件で駆動し感熱紙に印字し
た結果、各ドツトの発色点の濃度もほぼ同じで、非常に
高品位な印字が可能であった。This head is 0.12W/dot, l/4duty,
As a result of printing on thermal paper by driving under the conditions of 32n+s/cycle, the density of the coloring point of each dot was almost the same, and very high quality printing was possible.
ここで、各ドツトの印字濃度をマイクロ濃度計を用いて
測定した結果、その濃度ばらつきは光学密度（ＯＤ）で
０Ｄ＝１．２±３％以内であった。Here, as a result of measuring the print density of each dot using a microdensitometer, the density variation was within 0D=1.2±3% in terms of optical density (OD).
これは従来のヘッドを用いたときの印字結果、０Ｄ＝１
．１±５％より発熱効率および印字品質の点で優れてい
ることが分かった。また、従来のヘッドを用いた場合、
印字の際、感熱紙や転写紙の表面を傷つけることがあっ
たが、発明のヘッドを用いた場合はそのようなこともな
く高品位な印字が出来た。This is the printing result when using a conventional head, 0D=1
．． It was found that the heat generation efficiency and printing quality were superior to 1±5%. In addition, when using a conventional head,
During printing, the surface of thermal paper or transfer paper was sometimes damaged, but when the head of the invention was used, this did not occur and high-quality printing was possible.
（２）第４図は本発明の第２の実施例のサーマルヘッド
を説明するための発熱体部分の拡大図である。実施例１
と同様にグレーズ層を設けてなるアルミナ基板上に共通
電極および個別電極を設け、前記電極群の対向部上にＲ
ｕＯ２を主成分とする発熱用の抵抗体（厚み４−８μｍ
）をライン状に印刷焼成してのち抵抗体上の凸部の上部
を研磨紙を用いて１−２μｍ程度研磨することにより抵
抗体の上部を平坦にした発熱抵抗体８（厚み４−８μｍ
）を形成した。 つぎに、該抵抗体および電極群の一部
を覆うようにガラス層を印刷焼成し、耐摩耗層９（厚み
４−８μｍ１１）を形成した。 この場合、耐摩耗層用
のガラスは比較的軟化点の低いものを用いることでその
凸部の表面形状を平坦にすることが出来た。(2) FIG. 4 is an enlarged view of a heating element portion for explaining a thermal head according to a second embodiment of the present invention. Example 1
Similarly, a common electrode and individual electrodes are provided on an alumina substrate provided with a glaze layer, and R is provided on the opposing portion of the electrode group.
Resistor for heat generation whose main component is uO2 (thickness: 4-8 μm)
) was printed and fired in a line shape, and then the upper part of the convex part on the resistor was polished by about 1-2 μm using abrasive paper to make the upper part of the resistor flat.
) was formed. Next, a glass layer was printed and fired so as to cover part of the resistor and the electrode group to form a wear-resistant layer 9 (thickness 4-8 μm 11). In this case, by using a glass with a relatively low softening point for the wear-resistant layer, the surface shape of the convex portion could be made flat.
つぎに、実施例１と同様に通電過負荷トリミング法を用
いて、各発熱部の抵抗値を別々に調整し、全発熱部の抵
抗値を１１００Ω±１％以内にそろえた。Next, the resistance value of each heat generating part was adjusted separately using the current overload trimming method as in Example 1, so that the resistance values of all the heat generating parts were aligned within 1100Ω±1%.
このヘッドを０．１２Ｗ／ｄｏｔ、 ｌ／４ｄｕｔｙ、
３２ｍ５／ｃｙｃｌｅの条件で駆動し感熱紙に印字した
結果、各ドツトの発色点の濃度ばらつきも従来のヘッド
を用いたものより小さく、高品位な印字が可能であった
。This head is 0.12W/dot, l/4duty,
As a result of printing on thermal paper by driving under the conditions of 32 m5/cycle, the density variation of the coloring point of each dot was smaller than that using a conventional head, and high-quality printing was possible.
（３）実施例２にしめしたヘッドの発熱抵抗体上の凸部
のガラス層の表面を研磨紙を用いて１−２μｍ程度研磨
することにより凸部の上部をより平坦にし、かつ、耐摩
耗層の厚みを一定にしたヘッドを作製し、実施例１と同
様の印字試験を行った結果、各ドツトの発色点の濃度も
同じで、より高品位な印字が可能であった。(3) By polishing the surface of the glass layer of the convex part on the heating resistor of the head shown in Example 2 by about 1-2 μm using abrasive paper, the upper part of the convex part is made flatter and wear-resistant. A head with a constant layer thickness was prepared and a printing test similar to that in Example 1 was conducted. As a result, the density of the coloring point of each dot was the same, and higher quality printing was possible.
尚、前記実施例では発熱抵抗体をライン状とし電極はい
わゆる千鳥型電極の厚膜型サーマルヘッドについて記載
したが、本発明は前記実施例に特に限定されるものでな
く、基本的には厚膜技術により形成した発熱抵抗体もし
くは耐摩耗層を用いたヘッドてあれば、同様の効果を有
するものである。In the above embodiment, a thick film thermal head is described in which the heating resistor is in a line shape and the electrodes are so-called staggered electrodes, but the present invention is not particularly limited to the above embodiment. A head using a heat-generating resistor or wear-resistant layer formed by film technology will have similar effects.
更に、サーマルヘッドの基板はは−ろ一基板でもよく、
その他、ヘッドの各構成材料、ドツト抵抗値に関しても
、特に限定されるものでないことは言うまでもない。Furthermore, the substrate of the thermal head may be a single substrate,
It goes without saying that there are no particular limitations on the constituent materials of the head or the dot resistance values.
発明の効果
本発明によれば、サーマルヘッドの各ドツトの印字濃度
ムラを改善し、かつ、感熱紙と接触する部分が平坦であ
るため紙と発熱部との当りを良くすることにより発熱効
率、熱応答性を向上することが可能で、高速に高品位印
字可能なサーマルヘッドを提供することができる。Effects of the Invention According to the present invention, the printing density unevenness of each dot of the thermal head is improved, and since the part that contacts the thermal paper is flat, the contact between the paper and the heat generating section is improved, thereby increasing heat generation efficiency. It is possible to improve thermal response and provide a thermal head capable of high-speed, high-quality printing.
第１図は本発明の一実施例のサーマルヘッドの断面構成
図、第２図は同サーマルヘッドの電極構成を示す平面図
、第３図は断面構成図の部分拡大図、第４図は本発明の
大２の実施例のサーマルヘッドの断面構成図の部分拡大
図、第５図は従来例のサーマルヘッドの断面構成図の部
分拡大図である。
１・・・基板、２・・・ブレース層、３・・・共通電極
、４・・・個別電極、５・・・発熱抵抗体、７・・・耐
摩耗層。
代理人の氏名 弁理士 中尾敏男 はか１名第５図FIG. 1 is a cross-sectional configuration diagram of a thermal head according to an embodiment of the present invention, FIG. 2 is a plan view showing the electrode configuration of the thermal head, FIG. 3 is a partially enlarged view of the cross-sectional configuration diagram, and FIG. FIG. 5 is a partially enlarged view of a sectional view of a thermal head according to a second embodiment of the invention, and FIG. 5 is a partially enlarged view of a sectional view of a conventional thermal head. DESCRIPTION OF SYMBOLS 1... Substrate, 2... Brace layer, 3... Common electrode, 4... Individual electrode, 5... Heating resistor, 7... Wear-resistant layer. Name of agent: Patent attorney Toshio Nakao Figure 5
Claims (1)
電極を設け、前記電極群上に発熱用の抵抗体を設け、前
記発熱抵抗体および電極群の一部を覆うように耐摩耗層
を形成し、前記発熱抵抗体もしくは前記発熱抵抗体上の
耐摩耗層表面を部分的に平坦にしたことを特徴とするサ
ーマル ヘッド。[Scope of Claims] A first group of common electrodes and a second group of individual electrodes for energization are provided on a substrate, a heat generating resistor is provided on the electrode group, and one of the heat generating resistors and the electrode group is provided. A thermal head characterized in that a wear-resistant layer is formed so as to cover the heating resistor, and a surface of the heating resistor or the wear-resistant layer on the heating resistor is partially flattened.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3570188A JPH01209160A (en) | 1988-02-18 | 1988-02-18 | Thermal head |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3570188A JPH01209160A (en) | 1988-02-18 | 1988-02-18 | Thermal head |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01209160A true JPH01209160A (en) | 1989-08-22 |
Family
ID=12449178
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3570188A Pending JPH01209160A (en) | 1988-02-18 | 1988-02-18 | Thermal head |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01209160A (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS557474A (en) * | 1978-07-04 | 1980-01-19 | Mitsubishi Electric Corp | Forming method for film resistor of thermal recording head |
| JPS557472A (en) * | 1978-07-04 | 1980-01-19 | Mitsubishi Electric Corp | Forming method for thermal recording head |
-
1988
- 1988-02-18 JP JP3570188A patent/JPH01209160A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS557474A (en) * | 1978-07-04 | 1980-01-19 | Mitsubishi Electric Corp | Forming method for film resistor of thermal recording head |
| JPS557472A (en) * | 1978-07-04 | 1980-01-19 | Mitsubishi Electric Corp | Forming method for thermal recording head |
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