JPH0751362B2 - Thermal head - Google Patents
Thermal headInfo
- Publication number
- JPH0751362B2 JPH0751362B2 JP63191372A JP19137288A JPH0751362B2 JP H0751362 B2 JPH0751362 B2 JP H0751362B2 JP 63191372 A JP63191372 A JP 63191372A JP 19137288 A JP19137288 A JP 19137288A JP H0751362 B2 JPH0751362 B2 JP H0751362B2
- Authority
- JP
- Japan
- Prior art keywords
- electrodes
- electrode
- thermal head
- individual
- common electrode
- 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
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
Description
【発明の詳細な説明】 〔産業上の利用分野〕 この発明は、フアクシミリやプリンター等の記録装置に
使用するサーマルヘツドに係るもので、特に絶縁基板上
に直線状に発熱抵抗体を配列し、この上面に感熱記録紙
を接触させ、発熱抵抗体の選択的加熱により記録するサ
ーマルヘツドの発熱基板に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a thermal head used in a recording device such as a facsimile or a printer, and in particular, a heating resistor is linearly arranged on an insulating substrate, The present invention relates to a heat generating substrate of a thermal head for recording by recording a heat sensitive recording sheet on the upper surface of the heat sensitive resistor.
第４図、第５図は例えば特開昭54−110848号公報にある
従来のサーマルヘツドの発熱基板（50）を示す図で、第
４図は断面図、第５図は部分平面図を示す。4 and 5 are views showing a heating substrate (50) of a conventional thermal head disclosed in, for example, Japanese Patent Laid-Open No. 54-110848, FIG. 4 is a sectional view, and FIG. 5 is a partial plan view. .
図において、（１）はセラミツクなどの絶縁基板、
（２）はグレーズ層、（３）はリード電極でくし歯状を
なす共通電極（3a）と、直線状の個別電極（3b）とを交
互に複数個対向配置することにより構成されている。
（４）は発熱抵抗体、（５）は保護膜ガラスである。In the figure, (1) is an insulating substrate such as ceramic,
(2) is a glaze layer, and (3) is a lead electrode and is formed by alternately arranging a plurality of comb-shaped common electrodes (3a) and linear individual electrodes (3b) alternately.
(4) is a heating resistor, and (5) is a protective film glass.
次にこの発熱基板（50）の製作法および動作を説明す
る。第４図、第５図において、絶縁基板（１）の上に、
ガラス材料等で構成されたグレーズ層（２）を印刷し、
このグレース層（２）の上に、An（金）等の導体ペース
トを印刷、焼成しリード電極（３）を形成する。次にRu
O2（酸化ルテニウム）等を主成分とする抵抗ペーストを
印刷、焼成し、発熱抵抗体（４）を形成する。次にAl2O
3,SiO2等を主成分とするガラスペーストを発熱抵抗体
（４）を覆うように印刷、焼成し、保護膜ガラス（５）
を形成する。Next, the manufacturing method and operation of this heat generating substrate (50) will be described. In FIGS. 4 and 5, on the insulating substrate (1),
Print the glaze layer (2) composed of glass material,
On this grace layer (2), a conductor paste such as An (gold) is printed and fired to form a lead electrode (3). Then Ru
A resistance paste containing O 2 (ruthenium oxide) as a main component is printed and fired to form a heating resistor (4). Then Al 2 O
A glass paste containing 3 , SiO 2, etc. as a main component is printed and baked so as to cover the heating resistor (4), and a protective film glass (5)
To form.
以上のようにして製作されたサーマルヘツドの感熱基板
（50）は、共通電極（3a）に電圧を印加し、個別電極
（3b）を選択的にON−OFFすることにより、発熱抵抗体
（４）は例えば第５図の斜線部に示す発熱素子（4a）が
発熱する。この発熱素子（4a）の発熱は上部の保護膜ガ
ラス（５）に伝達し部分加熱される。この熱により図示
しないプラテンローラと保護膜ガラス（５）との間の感
熱紙（図示せず）が発色し、ドツトを形成する。The heat-sensitive substrate (50) of the thermal head manufactured as described above applies voltage to the common electrode (3a) and selectively turns on and off the individual electrodes (3b) to generate the heating resistor (4). ), The heating element (4a) shown in the shaded area in FIG. 5 generates heat. The heat generated by the heating element (4a) is transmitted to the upper protective film glass (5) and is partially heated. Due to this heat, a thermal paper (not shown) between the platen roller (not shown) and the protective film glass (5) develops color to form dots.
第６図は、上記により感熱紙に印字させた時のドツト
（６）を例示したものであり、第１ラインの印字が完了
後感熱紙が１ラインステツプして第２ラインの印字が行
われる。FIG. 6 exemplifies the dots (6) when printing is performed on the thermal paper as described above. After the printing of the first line is completed, the thermal paper is stepped by one line and the second line is printed. .
従来のサーマルヘツドは以上のように構成されているの
で、次のような問題があつた。Since the conventional thermal head is constructed as described above, it has the following problems.
すなわち、くし歯状の共通電極（3a）と直線状の個別電
極（3b）とを交互に複数個対向配置され構成されている
が、これらの電極（3a）（3b）に電圧を印加したとき、
リード電極間間隙、すなわち相対向する電極（3a）（3
b）面の直交距離が一定でないため第７図に示すように
電気力線（Ｅ）の分布が均等でなく、そのため第５図に
示す発熱抵抗体（４）の発熱素子（4a）内において温度
むらが発生する。これはドツトの副走査方向に対して著
しい。従つて、感熱紙の印字ドツトが不鮮明となるとい
う問題点があつた。That is, a plurality of comb-shaped common electrodes (3a) and linear individual electrodes (3b) are alternately arranged so as to face each other. When a voltage is applied to these electrodes (3a) (3b). ,
The gap between the lead electrodes, that is, the opposing electrodes (3a) (3
b) Since the orthogonal distances between the planes are not constant, the distribution of the lines of electric force (E) is not uniform as shown in FIG. 7, so that in the heating element (4a) of the heating resistor (4) shown in FIG. Temperature unevenness occurs. This is remarkable in the dot sub-scanning direction. Therefore, there is a problem in that the printing dots on the thermal paper become unclear.
この発明は、上記のような問題点を解消するためになさ
れたもので、リード電極を形成する共通電極と個別電極
の間隙を一定値に配置して電気力線分布を均等化し発熱
抵抗体の発熱を均一化して印字ドツトを鮮明とするもの
である。The present invention has been made in order to solve the above problems, and the gap between the common electrode and the individual electrode forming the lead electrode is arranged at a constant value to make the distribution of the lines of electric force uniform and The heat generation is made uniform and the printed dots are made clear.
この発明に係るサーマルヘツドは、絶縁基板と、この絶
縁基板上に形成された発熱抵抗体と、上記発熱抵抗体に
電圧を印加する共通電極と個別電極よりなるリード電極
を備えて、上記リード電極の対向する間隙が一定値に配
置されたものである。A thermal head according to the present invention includes an insulating substrate, a heating resistor formed on the insulating substrate, a lead electrode including a common electrode for applying a voltage to the heating resistor and an individual electrode. The gaps facing each other are arranged at a constant value.
この発明におけるサーマルヘツドは、共通電極と個別電
極とで構成されるリード電極の対向間隙が一定値に配置
されたので、電極間の電気力線分布が均等化され、発熱
抵抗体の発熱が均一化して印字ドツトが鮮明となる。In the thermal head according to the present invention, since the opposing gaps of the lead electrodes composed of the common electrode and the individual electrode are arranged at a constant value, the distribution of the lines of electric force between the electrodes is equalized and the heat generation of the heating resistor is uniform. And the printed dots become clear.
〔発明の実施例〕 以下、この発明の一実施例を第１図、第２図、第３図に
ついて説明する。第１図は発熱基板（50）の一部を示す
平面図、第２図はリード電極（31）の詳細図である。[Embodiment of the Invention] An embodiment of the present invention will be described below with reference to FIGS. 1, 2, and 3. FIG. 1 is a plan view showing a part of the heat generating substrate (50), and FIG. 2 is a detailed view of the lead electrode (31).
第１図において、（１）はセラミツク等よりなる絶縁基
板、（２）はガラス材料で構成されたグレーズ層、（3
1）はリード電極でくし歯状の共通電極（31a）と複数の
個別電極（31b）とにされている。第２図は、リード電
極31の詳細図であり、絶縁基板上に設けられた帯状の発
熱抵抗膜上に複数の共通電極と個別電極を交互に配置し
て構成している。In FIG. 1, (1) is an insulating substrate made of ceramic or the like, (2) is a glaze layer made of a glass material, (3)
1) is a lead electrode, which is a comb-shaped common electrode (31a) and a plurality of individual electrodes (31b). FIG. 2 is a detailed view of the lead electrode 31, which is constructed by alternately arranging a plurality of common electrodes and individual electrodes on a strip-shaped heating resistance film provided on an insulating substrate.
ここで、各共通電極は上記発熱抵抗膜の幅方向に延び、
第２図に示すように、その先端部に近づくに従って幅広
の形状を有し、互いに隣り合う共通電極間においてその
縁部が馬蹄形状になるように連続して形成される。ま
た、各個別電極も第２図に示すように、隣り合う共通電
極の両先端部付近から共通電極における馬蹄形状の内部
にふくらみ、その先端部を丸みをもたせた円弧状になる
ように形成し、共通電極の縁部と個別電極の縁部の間隔
が一定値となるように構成配置している。（41）は発熱
抵抗体、（５）はAl2O3,SiO2等を主成分とする保護膜ガ
ラスである。Here, each common electrode extends in the width direction of the heating resistance film,
As shown in FIG. 2, it has a shape that widens as it approaches the tip, and is formed continuously between adjacent common electrodes so that the edge thereof has a horseshoe shape. Also, as shown in FIG. 2, each individual electrode is formed so that it bulges from the vicinity of both tips of the adjacent common electrodes to the inside of the horseshoe shape in the common electrode, and the tips are formed into a rounded arc shape. The gap between the edge of the common electrode and the edge of the individual electrode has a constant value. Reference numeral (41) is a heating resistor, and reference numeral (5) is a protective film glass containing Al 2 O 3 , SiO 2 or the like as a main component.
以上の第１図、第２図に示すように、この発明の絶縁基
板（１）、グレーズ層（２）、発熱抵抗体（41）、保護
膜ガラス（５）の基本構成は従来例と同じであるが、リ
ード電極（31）の形状、配置が従来例と異る。As shown in FIGS. 1 and 2 above, the basic structure of the insulating substrate (1), glaze layer (2), heating resistor (41) and protective film glass (5) of the present invention is the same as the conventional example. However, the shape and arrangement of the lead electrode (31) are different from those of the conventional example.
すなわち、従来例第５図に示した如くくし歯状共通電極
（3a）に直線状個別電極（3b）を組み合せてなるリード
電極（３）とは異り、この発明の一実施例は第２図に示
すように、共通電極（31a）の個別電極（31b）との間隙
（ｇ）すなわち相対向する電極（31a）（31b）面の直交
する距離を一定値となるよう形状を定めて配置したの
で、これらの電極（31a）（31b）間に電圧を印加したと
き、第３図に示すように電気力線の分布が均等となり、
このリード電極（31）に接する発熱抵抗体（41）を均等
に発熱させている。That is, unlike the lead electrode (3) formed by combining the comb-teeth-shaped common electrode (3a) with the linear individual electrode (3b) as shown in FIG. As shown in the figure, the common electrode (31a) and the individual electrode (31b) are arranged so that the gap (g), that is, the distance between the surfaces of the electrodes (31a) and (31b) facing each other, becomes a constant value. Therefore, when a voltage is applied between these electrodes (31a) and (31b), the distribution of the lines of electric force becomes uniform as shown in FIG.
The heating resistor (41) in contact with the lead electrode (31) is caused to generate heat evenly.
以上のように、この発明によれば発熱抵抗膜と、この発
熱抵抗膜に電圧を印加する複数の共通電極及び個別電極
を備え、共通電極を馬蹄形状になるように形成すると共
に、個別電極は隣り合う共通電極の両先端部付近から共
通電極における馬蹄形状の内部にふくらみ、その先端部
を円弧状になるように形成し、個別電極の縁部と共通電
極の縁部の間隔を一定としたので、両電極間に電圧を印
加したとき電気力線分布が両電極の対向する部分で全体
的に均等となり、発熱が均一となると共に、集中電流に
起因して生じる電極の破損を有効に防止することができ
る。As described above, according to the present invention, the heating resistor film and the plurality of common electrodes and individual electrodes for applying a voltage to the heating resistor film are provided, and the common electrode is formed in a horseshoe shape, and the individual electrode is A swelling in the shape of a horseshoe in the common electrode from the vicinity of both tips of the adjacent common electrodes, the tips were formed in an arc shape, and the interval between the edge of the individual electrode and the edge of the common electrode was made constant. Therefore, when a voltage is applied between both electrodes, the distribution of the lines of electric force becomes even in the opposing parts of both electrodes, heat generation becomes uniform, and the damage of the electrodes caused by the concentrated current is effectively prevented. can do.
第１図〜第３図はこの発明の一実施例によるサーマルヘ
ツド装置の図で、第１図は発熱基板の一部を示す平面
図、第２図はリード電極図、第３図は電気力線分布を示
す説明図、第４図は従来のサーマルヘツド発熱基板断面
図、第５図は発熱抵抗体の発熱状態を示す例示図、第６
図は印字ドツトの説明図、第７図は従来のものの電気力
線分布を示す説明図である。 （１）は絶縁基板、（31）はリード電極、（31a）は共
通電極、（31b）は個別電極、（41）は発熱抵抗体、（5
0）は発熱基板、（ｇ）は間隙である。 なお、図中同一符号は同一又は相当部分を示す。1 to 3 are views of a thermal head device according to an embodiment of the present invention. FIG. 1 is a plan view showing a part of a heat generating substrate, FIG. 2 is a lead electrode diagram, and FIG. 3 is an electric force. FIG. 4 is an explanatory view showing a line distribution, FIG. 4 is a sectional view of a conventional thermal head heating substrate, FIG. 5 is an exemplary view showing a heating state of a heating resistor, and FIG.
FIG. 7 is an explanatory view of a printing dot, and FIG. 7 is an explanatory view showing a distribution of electric force lines of a conventional one. (1) is an insulating substrate, (31) is a lead electrode, (31a) is a common electrode, (31b) is an individual electrode, (41) is a heating resistor, (5)
0) is a heat generating substrate, and (g) is a gap. The same reference numerals in the drawings indicate the same or corresponding parts.
Claims (1)
と、この発熱抵抗膜と重なって上記発熱抵抗膜の長さ方
向に沿って交互に配置された複数の共通電極および個別
電極とを具備し、各共通電極は上記発熱抵抗膜の幅方向
に延び、その先端部に延びるに従って幅広とし、互いに
隣り合う共通電極間でその縁部を馬蹄形状になるように
連続して形成すると共に、各個別電極な隣り合う共通電
極の両先端部付近から上記共通電極における上記馬蹄形
状の内部にふくらみ、その先端部を円弧状になるように
形成し、上記個別電極の縁部と上記共通電極の縁部の間
隔を一定としたことを特徴とするサーマルヘッド。1. A strip-shaped heat generating resistance film provided on an insulating substrate, and a plurality of common electrodes and individual electrodes which overlap with the heat generating resistance film and are alternately arranged along the length direction of the heat generating resistance film. Each of the common electrodes extends in the width direction of the heating resistance film, becomes wider as it extends to the tip thereof, and the edges are formed continuously between adjacent common electrodes in a horseshoe shape. , Each individual electrode is bulged from the vicinity of both ends of the adjacent common electrode to the inside of the horseshoe shape in the common electrode, and the ends are formed in an arc shape, and the edge of the individual electrode and the common electrode The thermal head is characterized in that the distance between the edges of the thermal head is constant.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63191372A JPH0751362B2 (en) | 1988-07-29 | 1988-07-29 | Thermal head |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63191372A JPH0751362B2 (en) | 1988-07-29 | 1988-07-29 | Thermal head |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0239955A JPH0239955A (en) | 1990-02-08 |
| JPH0751362B2 true JPH0751362B2 (en) | 1995-06-05 |
Family
ID=16273492
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63191372A Expired - Fee Related JPH0751362B2 (en) | 1988-07-29 | 1988-07-29 | Thermal head |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0751362B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2534041Y2 (en) * | 1990-07-14 | 1997-04-30 | 富士ゼロックス株式会社 | Thick film type thermal head |
| JPH0747115B2 (en) * | 1991-11-05 | 1995-05-24 | 長廣 仁蔵 | Fine bubble generating method and fine bubble generating apparatus |
| US6886921B2 (en) | 2003-04-02 | 2005-05-03 | Lexmark International, Inc. | Thin film heater resistor for an ink jet printer |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0647296B2 (en) * | 1985-03-15 | 1994-06-22 | ロ−ム株式会社 | Thermal print head |
| JPH01232069A (en) * | 1988-03-11 | 1989-09-18 | Matsushita Electric Ind Co Ltd | Thermal head |
-
1988
- 1988-07-29 JP JP63191372A patent/JPH0751362B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0239955A (en) | 1990-02-08 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |