JPH01232070A - Thermal head - Google Patents
Thermal headInfo
- Publication number
- JPH01232070A JPH01232070A JP5874488A JP5874488A JPH01232070A JP H01232070 A JPH01232070 A JP H01232070A JP 5874488 A JP5874488 A JP 5874488A JP 5874488 A JP5874488 A JP 5874488A JP H01232070 A JPH01232070 A JP H01232070A
- Authority
- JP
- Japan
- Prior art keywords
- thermal head
- heating resistor
- electrode
- electrodes
- 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.)
- Pending
Links
- 238000010438 heat treatment Methods 0.000 claims description 27
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 abstract description 2
- 239000010931 gold Substances 0.000 abstract description 2
- 229910052737 gold Inorganic materials 0.000 abstract description 2
- 239000000758 substrate Substances 0.000 description 6
- 239000004020 conductor Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 239000010408 film Substances 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000010409 thin film Substances 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000004040 coloring Methods 0.000 description 1
- 210000003298 dental enamel Anatomy 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000004519 grease Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 238000004544 sputter deposition Methods 0.000 description 1
- 238000009966 trimming Methods 0.000 description 1
- 238000007740 vapor deposition 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
- B41J2/345—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 characterised by the arrangement of resistors or conductors
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、ファクシミリ受信装置などの感熱記録部に用
いられるサーマルヘッドに関スル。DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a thermal head used in a heat-sensitive recording section of a facsimile receiving device or the like.
従来の技術
ファクシミリ受信装置等に組込まれた感熱記録部には、
多数の発熱抵抗素子からなる発熱抵抗体を用いたサーマ
ルヘッドで信号に応じて発熱抵抗素子を発熱させて感熱
記録を行っている。この感熱記録時の記録濃度はサーマ
ルヘッドの発熱抵抗体の単位体積轟りの発熱量により決
り、発熱ドツトの抵抗値や体積にばらつきがあると各ド
ツトの発熱量が異なり、印字濃度むらの原因となる。Conventional technology The heat-sensitive recording unit built into facsimile receiving equipment, etc.
A thermal head using a heating resistor consisting of a large number of heating resistive elements generates heat in response to a signal to perform thermal recording. The recording density during thermal recording is determined by the amount of heat generated per unit volume of the heat-generating resistor of the thermal head, and if there are variations in the resistance value or volume of the heat-generating dots, the amount of heat generated by each dot will differ, causing uneven print density. becomes.
第７図は従来のこの種のサーマルヘッドの断面構成図で
ある。アルミナ基板１１上に、ガラスグレーズ層１２を
形成し、この基板上に共通電極１２、個別電極１４を交
互に配列するように形成し、この電極上に酸化ルチルニ
ウムからなる共通発熱抵抗体１５を形成し、更に耐摩耗
層１６を形成する。FIG. 7 is a sectional view of a conventional thermal head of this type. A glass glaze layer 12 is formed on an alumina substrate 11, a common electrode 12 and individual electrodes 14 are formed on this substrate so as to be arranged alternately, and a common heating resistor 15 made of ruthirium oxide is formed on this electrode. Then, a wear-resistant layer 16 is further formed.
第８図は第７図に示した従来のサーマルヘッドにおける
電極形状を示した平面図である。帯状の共通発熱抵抗体
６に９通電用の導体電極（共通電極１３と個別電極１４
）を両側から交互に導入配置している。また、電極１３
．１４にはそれぞれ両側の発熱部分１３ａ、１３ｂ、１
４ａ、１４ｂが対応し１つのドツトを構成している。FIG. 8 is a plan view showing the shape of the electrodes in the conventional thermal head shown in FIG. 9 conductor electrodes (common electrode 13 and individual electrodes 14
) are introduced alternately from both sides. In addition, the electrode 13
．． 14 has heat generating parts 13a, 13b, 1 on both sides, respectively.
4a and 14b correspond to each other and constitute one dot.
このように構成したサーマルヘッドは、導体電極にパル
ス的に電圧を印加することによって、発熱抵抗体１６に
電流を流し３００〜４６０°Ｃの高温に発熱せしめこの
上面部を通過する感熱記録紙を発色させ、受信信号に対
応した、文字２図柄などを記録するようにしている。The thermal head configured as described above applies a pulsed voltage to the conductive electrode to cause current to flow through the heating resistor 16 to generate heat at a high temperature of 300 to 460°C, and the thermal recording paper passing through the upper surface of the heating resistor 16 is heated. It is designed to develop color and record characters, two patterns, etc. that correspond to the received signal.
発明が解決しようとする課題
しかし、従来の厚膜型のサーマルヘッドでは、薄膜型の
サーマルヘッドの如く抵抗体金属を蒸着またはスパッタ
リング等の手法で抵抗体を形成するのではなく印刷によ
り帯状の共通発熱体６を形成する。そのため、帯状抵抗
体幅ｙを均一に形成することが困難であること、また、
抵抗体形状にもばらつきが生ずること、および抵抗体内
部への気泡の発生や、導体電極と発熱抵抗体との均一接
触の不都合等により、各導体電極間（共通電極と個別電
極間）の抵抗値のばらつきが大きく士数多となっている
。この場合、通電過負荷トリミング方式（発熱抵抗体に
成力を供給したときに生じる自己発生ジュール熱による
抵抗値変化を利用する方法）を用いて、ドツトの抵抗値
をトリミングして±１％程度に均一に合わせることは出
来るが抵抗体形状や、内部気泡および導体電極との接触
不都合等のために抵抗体の単位体積当りの発熱量を均一
にすることが出来なかった。さらに、同一ドツト内の２
つの発熱抵抗素子の抵抗狙を同じ値にすることは不可能
であり、その結果、同一ドツト内の２つの発色点の濃度
が異なり、印字濃度むらの原因となっている。Problems to be Solved by the Invention However, in conventional thick-film thermal heads, the resistor metal is not formed by vapor deposition or sputtering, as is the case with thin-film thermal heads. A heating element 6 is formed. Therefore, it is difficult to form the strip resistor width y uniformly, and
The resistance between each conductor electrode (between the common electrode and the individual electrodes) may vary due to variations in the shape of the resistor, the formation of air bubbles inside the resistor, and the inconvenience of uniform contact between the conductor electrode and the heating resistor. The dispersion of values is large and the number of people is high. In this case, the resistance value of the dot is trimmed to about ±1% using the current overload trimming method (a method that utilizes the change in resistance value due to self-generated Joule heat that occurs when power is supplied to the heating resistor). However, due to the shape of the resistor, internal air bubbles, inconvenience in contact with the conductor electrode, etc., it has not been possible to make the amount of heat generated per unit volume of the resistor uniform. Furthermore, 2 within the same dot
It is impossible to set the resistance targets of two heating resistive elements to the same value, and as a result, the densities of two coloring points within the same dot are different, causing uneven print density.
本発明は上記した従来の欠点をなくし、印字濃度のむら
をすくなくし、印字品質を向上させることを目的とする
ものである。It is an object of the present invention to eliminate the above-mentioned conventional drawbacks, reduce unevenness in print density, and improve print quality.
課題を解決するための手段
この目的を達成するため本発明は、共通電極および個別
電極を各々交互に帯状抵抗体に対して斜めに横切るよう
に配設したものである。Means for Solving the Problems In order to achieve this object, the present invention is such that common electrodes and individual electrodes are alternately arranged diagonally across the strip resistor.
作 用
本発明の構成によれば特に厚膜のサーマルヘッドにおい
て各々の発熱抵抗素子の抵抗バラツキが大きな場合にお
いても印字濃度むらをあまり発生させず高品位印字ので
きるサーマルヘッドを提供することができる。According to the configuration of the present invention, it is possible to provide a thermal head that can perform high-quality printing without causing much uneven printing density even when the resistance variation of each heating resistor element is large, especially in a thick-film thermal head. .
実施例
第１図は本発明の一実施例の厚膜型サーマルヘッドの断
面構成図でちる。アルミナ基板１上に、ガラスグレーズ
層２を形成し、金（厚み０．５〜１．０μｍ）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
の間隔で交互に配列するように形成し、これらの電極３
，４上に酸化ルテニウムからなる帯状の発熱抵抗体６を
形成し、更に耐摩耗層６を形成した。Embodiment FIG. 1 is a sectional view of a thick film type thermal head according to an embodiment of the present invention. A glass glaze layer 2 is formed on an alumina substrate 1, and a common electrode 3 and individual electrodes 4 made of gold (thickness: 0.5 to 1.0 μm) are formed at a dot pitch of 167 μm.
These electrodes 3 are formed so as to be arranged alternately at intervals of
.
第２図は、本発明の一実施例のサーマルヘッドの電極形
状を示す平面図で、帯状発熱抵抗体６の両側から交互に
共通電極３１個別電極４を帯状発熱抵抗体６に対し、科
目に横切るように交差させている。このときの交差角度
をθとした。このときの角度θは各々の電極３，４の発
熱抵抗体５と０２点の交差点Ａ、Ｂの長手方向の電極間
距離をＸ、帯状発熱抵抗体６の長手方向に対して直角方
向の幅をｙとしたときθ＝＝ｊａｎ ｙ／ｘで表わさ
れる角度θとした。さらに第２図の実施例を具体的に説
明すると、
・共通電極と個別電極間距離Ｘ・・・１６７μｍ・帯状
抵抗体幅ｙ ・・・・・・・・・・・・３５０μｍ
ｙ ／ ｘ ＝＝ ２−０９６
θ＝ｊａｎ ２．０９６
となり、θは、６４．５°とした。FIG. 2 is a plan view showing the electrode shape of a thermal head according to an embodiment of the present invention, in which common electrodes 31 and individual electrodes 4 are alternately connected to the strip-shaped heating resistor 6 from both sides of the strip-shaped heating resistor 6. It is crossed so that it crosses. The intersection angle at this time was defined as θ. At this time, the angle θ is the distance between the electrodes in the longitudinal direction of the intersections A and B of the heating resistor 5 of each electrode 3 and 4, and the width of the strip heating resistor 6 in the direction perpendicular to the longitudinal direction. When is y, the angle θ is expressed as θ==jan y/x. Further, to specifically explain the embodiment shown in Fig. 2, ・Distance between common electrode and individual electrodes X...167 μm・Width of band-shaped resistor y ・・・・・・・・・350 μm
y/x==2-096 θ=jan 2.096, and θ was 64.5°.
このような構成において、発熱抵抗体５、電極３．４か
らなる発熱抵抗素子１ａ、１ｂ、２ａ。In such a configuration, heating resistive elements 1a, 1b, 2a each include a heating resistor 5 and an electrode 3.4.
２ｂを用いて印字した印字状態（第３図）と第８図に示
した従来電極形状からなる発熱抵抗素子１３ａ、１３ｂ
、１４ａ、１４ｂを用いて印字した印字状態（第４図）
を比較した。ただし発熱抵抗素子の抵抗値は（１ａ＃２
＆）＜（１ｂ＋２ｂ）。2b (Fig. 3) and the heating resistor elements 13a, 13b with conventional electrode shapes shown in Fig. 8.
, 14a, 14b (Fig. 4)
compared. However, the resistance value of the heating resistor element is (1a#2
&)<(1b+2b).
（３ａ＋４ａ）＜（３ｂ’ｑ４ｂ）である。(3a+4a)<(3b'q4b).
本実施例の感熱紙送り方向Ａに対し発熱抵抗素子を傾け
て形成した場合の印字状態（第３図）は、あたかも黒化
度を向上させた如く、印字濃度むらの少ない高品質の印
画が得られた。これに対し、従来電極形状からなる発熱
抵抗素子で印字した印字状態（第４図）では、発色部分
の濃淡が感熱記録紙の送り方向Ａに沿ってライン状に表
われた。In this example, when the heating resistor element is tilted with respect to the thermal paper feeding direction A, the printing condition (Fig. 3) is as if the degree of blackening has been improved, resulting in high-quality printing with less uneven printing density. Obtained. On the other hand, in the printing state (FIG. 4) in which printing was performed using a heating resistor element having a conventional electrode shape, the shading of the colored portion appeared in a line shape along the feeding direction A of the thermal recording paper.
人が目視によって感じる濃度むらは、白色部の面積の大
なる第４図の方が大きく、第３図の本願構成においては
目視において濃度むらを目立たなくさせる効果を有して
いた。The density unevenness that a person perceives visually is larger in FIG. 4, where the area of the white part is larger, and the configuration of the present application shown in FIG. 3 had the effect of making the density unevenness less noticeable when visually observed.
次に角度θが大きくなった場合と小さくなった場合の印
字状態を第５図、第６図に示した。Next, FIGS. 5 and 6 show printing conditions when the angle θ becomes large and small.
第６図の角度、θが小さい場合は、第３図の例よシも、
さらに黒化度が向上した印字濃度むらの小さい印画が得
られた。第６図の角度θが大きい場合は、第４図に示し
た従来例による印画品よりは、黒化度は向上したが第３
図に示した印画品よりは濃度むらは大であった。If the angle θ in Fig. 6 is small, the example in Fig. 3 can also be used.
Furthermore, prints with an improved degree of blackening and less uneven print density were obtained. When the angle θ in FIG. 6 is large, the degree of blackening is improved compared to the conventional print product shown in FIG.
The density unevenness was greater than that of the print shown in the figure.
以上の如く角度θと印画品質には大きな相関関係があり
、角度θが小なる程印画品質は向上する。As described above, there is a strong correlation between the angle θ and print quality, and the smaller the angle θ, the better the print quality.
ただし、製造等の観点より判断すると角度θが小なる程
、電極形成等の精度は悪くなる。よって従来の電極間隔
をＸにとり、θ＝ｔａｎ−１ｙ／ ”１を一つの目安と
して設計することが重要である。However, judging from the viewpoint of manufacturing, etc., the smaller the angle θ, the worse the accuracy of electrode formation, etc. Therefore, it is important to take the conventional electrode spacing as X and design using θ=tan-1y/''1 as a guideline.
なお、上記実施例では厚膜型の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限定されるものでは
なく、本発明の効果を奏するような電極形状とした場合
は、薄膜型のサーマルヘッドでも同様の効果を有する。In addition, although the above embodiment describes a thick film type thermal head, the present invention is not limited to the above embodiment, and if the electrode shape is such that the effects of the present invention are achieved, a thin film type thermal head may be used. The head also has a similar effect.
また、基板はほうろう基板でも良く、その他ヘツドの各
構成材料に特に限定されるものではない。さらに、上記
実施例では、電極を直線形状にしているが、曲線形状に
してもよい。Further, the substrate may be an enamel substrate, and the materials constituting the head are not particularly limited. Further, in the above embodiments, the electrodes have a linear shape, but they may have a curved shape.
発明の効果
以上の説明から明らかなように本発明によれば帯状発熱
抵抗体に対して電極を斜めに横切るように配設すること
により、サーマルヘッドの印字記録品質を向上させるこ
とが簡単な構造で可能となる。Effects of the Invention As is clear from the above explanation, according to the present invention, the print recording quality of the thermal head can be easily improved by arranging the electrode diagonally across the band-shaped heating resistor. This becomes possible.
第１図は本発明の一実施例のサーマルヘッドの断面図、
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、第５図、第６図は本発明のサーマルヘッドを用い
て印字したときの印画状態図、第４図は従来のサーマル
ヘッドを用いて印字したときの印画状態図、第７図は従
来例のサーマルヘッドの断面図、第８図は同サーマルヘ
ッドの電極構成を示す平面図である。
１・・・・・・基板、２・・・・・・グレーズ層、３・
出・・共通電極、４・・・・・・個別電極、６・川・・
発熱抵抗体、６・・・・・・耐摩耗層。
代理人の氏名 弁理士 中 尾 敏 男 ほか１名／−
−−差仮
２−−−グリース・７蕾
３−一鉄蓋電ホ
４−一個Ｊ’Ｊ宅ゐ
・５− ノに然寸ａａイ衣
第２図
第３図
第４図
第５図
第６図
第７図FIG. 1 is a sectional view 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, Figs. 3, 5, and 6 are printing state diagrams when printing using the thermal head of the present invention, and Fig. 4 is a conventional thermal head. FIG. 7 is a sectional view of a conventional thermal head, and FIG. 8 is a plan view showing the electrode configuration of the thermal head. 1...Substrate, 2...Glaze layer, 3.
Output: Common electrode, 4: Individual electrode, 6: River...
Heat generating resistor, 6... wear-resistant layer. Name of agent: Patent attorney Toshio Nakao and 1 other person/-
--Difference 2---Grease 7 buds 3-1 iron cover electric wire 4-1 piece J'J house 5--No.2 size aa clothes Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7
Claims (2)
するための共通電極群と、前記共通電極群と対向し、か
つ前記発熱抵抗体と交差する通電用の個別電極群とを備
え、前記共通電極および個別電極を各々交互に帯状抵抗
体に対して斜めに横切るように配設したサーマルヘッド
。(1) A group of common electrodes that intersect with the band-shaped heating resistor for energizing the heating resistor, and a group of individual electrodes for energization that face the common electrode group and intersect with the heating resistor. A thermal head, wherein the common electrode and the individual electrodes are alternately arranged diagonally across the strip resistor.
体との２点の交差点の長手方向距離ｘと、発熱抵抗体の
長手方向に対して直角方向の幅ｙとから表わされる角度
θ、 θ＝ｔａｎ＾−＾１ｙ／ｘ で発熱抵抗体を斜めに横切るように配設した特許請求の
範囲第１項記載のサーマルヘッド。(2) An angle θ between the common electrode and the individual electrodes expressed by the longitudinal distance x between the two points of intersection of each electrode with the heating resistor and the width y perpendicular to the longitudinal direction of the heating resistor. , θ=tan^-^1y/x The thermal head according to claim 1, wherein the thermal head is disposed diagonally across the heating resistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5874488A JPH01232070A (en) | 1988-03-11 | 1988-03-11 | Thermal head |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5874488A JPH01232070A (en) | 1988-03-11 | 1988-03-11 | Thermal head |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01232070A true JPH01232070A (en) | 1989-09-18 |
Family
ID=13093043
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5874488A Pending JPH01232070A (en) | 1988-03-11 | 1988-03-11 | Thermal head |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01232070A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2014087938A (en) * | 2012-10-29 | 2014-05-15 | Rohm Co Ltd | Thermal print head |
| JP2018012341A (en) * | 2017-10-04 | 2018-01-25 | ローム株式会社 | Thermal print head |
| JP2020196211A (en) * | 2019-06-04 | 2020-12-10 | ローム株式会社 | Thermal print head |
-
1988
- 1988-03-11 JP JP5874488A patent/JPH01232070A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2014087938A (en) * | 2012-10-29 | 2014-05-15 | Rohm Co Ltd | Thermal print head |
| JP2018012341A (en) * | 2017-10-04 | 2018-01-25 | ローム株式会社 | Thermal print head |
| JP2020196211A (en) * | 2019-06-04 | 2020-12-10 | ローム株式会社 | Thermal print head |
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