JPH0199862A - Thermal head - Google Patents
Thermal headInfo
- Publication number
- JPH0199862A JPH0199862A JP25676687A JP25676687A JPH0199862A JP H0199862 A JPH0199862 A JP H0199862A JP 25676687 A JP25676687 A JP 25676687A JP 25676687 A JP25676687 A JP 25676687A JP H0199862 A JPH0199862 A JP H0199862A
- Authority
- JP
- Japan
- Prior art keywords
- resistor
- heating
- electrode
- ink
- 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
- 238000010438 heat treatment Methods 0.000 claims abstract description 49
- 239000010410 layer Substances 0.000 claims description 8
- 239000000758 substrate Substances 0.000 claims description 5
- 239000011241 protective layer Substances 0.000 claims description 3
- 230000003647 oxidation Effects 0.000 description 4
- 238000007254 oxidation reaction Methods 0.000 description 4
- 239000011521 glass Substances 0.000 description 3
- 239000000155 melt Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 108010010803 Gelatin Proteins 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 229920000159 gelatin Polymers 0.000 description 1
- 239000008273 gelatin Substances 0.000 description 1
- 235000019322 gelatine Nutrition 0.000 description 1
- 235000011852 gelatine desserts Nutrition 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
Landscapes
- Electronic Switches (AREA)
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野］
この発明は、サーマルプリンタに用いられるサーマルヘ
ッドに関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a thermal head used in a thermal printer.
［従来技術］
第５図は従来のサーマルヘッドの構成を示す断面図であ
る。この図において、ｌは酸化アルミニウム製の基板で
あり、同基板ｌの上面には熱絶縁のためのガラスゲレー
ス層２が積層されている。[Prior Art] FIG. 5 is a sectional view showing the structure of a conventional thermal head. In this figure, l is a substrate made of aluminum oxide, and a glass gelase layer 2 for thermal insulation is laminated on the upper surface of the substrate l.
ガラスゲレース層２の上面には抵抗膜による発熱抵抗体
３が形成されており、発熱抵抗体３の上面には所定の距
離を隔てて電極４ａ、４ｂが形成されている。ここで、
発熱抵抗体３の電極４ａ、４ｂとの間に露出した・面が
発熱部３ｈとなる。また、電極４ａ、４ｂのうち一方が
共通電極に接続され、他方が図示しない給電制御部（発
熱抵抗体３に電流を流す機能を有する）の出力端に接続
されている。A heating resistor 3 made of a resistive film is formed on the top surface of the glass gelatin layer 2, and electrodes 4a and 4b are formed on the top surface of the heating resistor 3 at a predetermined distance apart. here,
The surface of the heating resistor 3 exposed between the electrodes 4a and 4b becomes the heating portion 3h. Further, one of the electrodes 4a and 4b is connected to a common electrode, and the other is connected to an output end of a power supply control section (having a function of flowing current to the heating resistor 3), not shown.
５は耐酸化膜であり、電極４ａ、４ｂおよび発熱部３ｈ
を覆うように形成されている。また、耐酸化膜５の上面
には耐摩耗膜６が形成されている。耐酸化膜５と耐摩耗
膜６は保護膜を構成する。5 is an oxidation-resistant film, which covers the electrodes 4a, 4b and the heat generating part 3h.
It is formed to cover. Furthermore, a wear-resistant film 6 is formed on the upper surface of the oxidation-resistant film 5 . The oxidation-resistant film 5 and the wear-resistant film 6 constitute a protective film.
第６図は、上述したサーマルヘッドの細部を示す平面図
であり、この図に示すように発熱抵抗体３の発熱部３ｈ
は方形状となっている。FIG. 6 is a plan view showing details of the above-mentioned thermal head, and as shown in this figure, the heating portion 3h of the heating resistor 3
has a rectangular shape.
このように構成されたサーマルヘッドにおいて、発熱抵
抗体３に電流が流れると、同抵抗体３の発熱部全面が均
一に発熱する。これにより、サーマルヘッドの上に置か
れたインクフィルムの前記発熱部に面した部分が加熱さ
れ、インクが溶融する。In the thermal head configured in this manner, when a current flows through the heat generating resistor 3, the entire surface of the heat generating portion of the resistor 3 generates heat uniformly. As a result, the portion of the ink film placed on the thermal head facing the heat generating portion is heated, and the ink is melted.
この結果、被転写用紙には、第６図に破線りで示す形状
のドツト印刷が行なわれる。As a result, dots having the shape shown by broken lines in FIG. 6 are printed on the transfer paper.
［発明が解決しようとする問題点コ
ところで、サーマルプリンタにおける画像の濃度階調を
表現するためには、印刷されるドツトの大きさを制御す
ることが望ましいが、上述したように従来のサーマルヘ
ッドにあっては、発熱抵抗体の発熱部の形状に基づいた
形状でしかドツト印刷を行なうことができず、ドツトの
大きさを制御する事ができなかった。[Problems to be Solved by the Invention] By the way, in order to express the density gradation of an image using a thermal printer, it is desirable to control the size of the printed dots, but as mentioned above, the conventional thermal head In this case, it was only possible to print dots in a shape based on the shape of the heat generating part of the heating resistor, and the size of the dots could not be controlled.
この発明は上述した事情に鑑みてなされたもので、印刷
されるドツトの大きさを制御することができるサーマル
ヘッドを提供することを目的としている。The present invention has been made in view of the above-mentioned circumstances, and an object of the present invention is to provide a thermal head that can control the size of printed dots.
［問題点を解決するための手段］
上記問題点を解決するためこの発明は、基板表面に熱絶
縁層が形成され、その上に抵抗膜による発熱抵抗体と、
この発熱抵抗体に電流を供給する第１ｆｆｌ極、第２電
極と、表面を保護する保護層とが順次積層されてなるサ
ーマルヘッドにおいて、前記発熱抵抗体に前記第１電極
から前記第２電極に至る向きに平行して走る境界部を形
成し、この境界部の前記発熱抵抗体を除去し、各々幅の
異なる複数の発熱抵抗体を形成した事を特徴としている
。[Means for Solving the Problems] In order to solve the above-mentioned problems, the present invention includes a heat insulating layer formed on the surface of the substrate, a heat generating resistor formed of a resistive film on the heat insulating layer, and
In a thermal head in which a first ffl pole and a second electrode for supplying current to the heating resistor, and a protective layer for protecting the surface are sequentially laminated, the heating resistor is connected from the first electrode to the second electrode. The present invention is characterized in that a boundary portion running in parallel in all directions is formed, and the heat generating resistor at this boundary portion is removed to form a plurality of heat generating resistors each having a different width.
［作用］
上記構成によれば、各発熱抵抗体においてその幅が大き
い程、各々に面したインク面の受けろ単位面積当たりの
加熱量は大きくなる。従って、発熱抵抗体に流す電流の
通電時間またはその波高値を小とすれば、抵抗幅の大き
な抵抗体による加熱量が他に比較して大きくなり、その
抵抗体に面したインク面のインクのみが溶融され、発熱
抵抗体に流す電流の通電時間または波高値を大とすれば
、それに応じて抵抗幅の狭い抵抗体の加熱量ら大となり
、その抵抗体に面したインク面のインクも溶融される。[Function] According to the above configuration, the larger the width of each heating resistor, the larger the amount of heating per unit area of the ink receiving area of the ink surface facing each heating resistor. Therefore, if the current flow time or peak value of the current flowing through the heating resistor is made small, the amount of heating by the resistor with a large resistance width will be large compared to other resistors, and only the ink on the ink surface facing that resistor will be heated. If you increase the current duration or peak value of the current flowing through the heating resistor, the amount of heating of the resistor with a narrow resistance width will increase accordingly, and the ink on the ink surface facing the resistor will also melt. be done.
従って、発熱抵抗体に流す電流の通電時間またはその波
高値を制御すれば、印刷されるドツトの大きさを制御す
ることができる。Therefore, by controlling the duration of the current flowing through the heating resistor or its peak value, the size of the printed dots can be controlled.
［実施例］
以下図面を参照してこの発明の実施例ζこついて説明す
る。[Embodiments] Embodiments ζ of the present invention will be described in detail below with reference to the drawings.
第１図はこの発明の一実施例の構成を示す平面図、第２
図は第１図の■−■線断面図である。FIG. 1 is a plan view showing the configuration of an embodiment of the present invention, and FIG.
The figure is a sectional view taken along the line ■-■ in FIG.
なお、ここでは、前述した第５図と異なる部分のみを説
明し、同一の部分については第５図と対応する部分に同
一の符号を付してその説明を省略する。Here, only the parts that are different from the above-mentioned FIG. 5 will be explained, and the same parts as in FIG. 5 will be given the same reference numerals and the explanation thereof will be omitted.
第１図および第２図において、３ ａ、 ３ ｂ、 ３
ｃ、 ３ｄは各々電流路の長さが等しく幅Ｑａ−Ｑｄ
が異なる方形状の抵抗体であり、幅はＱａが最小でＱａ
−（ｌｂ→Ｑｃ→１２ｄの順に大きくなっている。抵抗
体３ａ〜３ｄの両端には電極４ａ、４ｂか取り付けられ
ており、これを介して各抵抗体３ａ〜３ｄに電流が供給
される。なお、第２図における７はインクフィルム、８
はインクフィルム７に付着されたインク、９は被転写用
紙である。In Figures 1 and 2, 3 a, 3 b, 3
c and 3d have the same current path length and width Qa-Qd.
It is a rectangular resistor with different widths, Qa is the minimum, and Qa is the minimum width.
-(It increases in the order of lb→Qc→12d. Electrodes 4a and 4b are attached to both ends of the resistors 3a to 3d, and current is supplied to each of the resistors 3a to 3d via these. In addition, 7 in FIG. 2 is an ink film, and 8
9 is the ink adhered to the ink film 7, and 9 is the transfer paper.
このような構成において、各発熱抵抗体３ａ〜３ｄに流
れる電流の電流密度は各々等しいので、各発熱抵抗体３
ａ〜３ｄにおける単位面積当たりの発熱量も等しい。従
って、各発熱抵抗体３８〜３ｄで発生した熱Ｑａ＝Ｑｄ
がすべてサーマルヘッドの上に置かれたインク面８の加
熱に使われる場合は、インク面８のどの抵抗体に面した
ｍ１分も一様に熱されインクが溶融する。In such a configuration, since the current density of the current flowing through each heating resistor 3a to 3d is equal, each heating resistor 3
The calorific value per unit area in a to 3d is also the same. Therefore, the heat generated in each heating resistor 38 to 3d is Qa=Qd
If all of the ink surface 8 is used to heat the ink surface 8 placed on the thermal head, the m1 portion of the ink surface 8 facing any resistor is uniformly heated and the ink melts.
しかし実際は、熱Ｑａ＝Ｑｄは、インク面８の加熱に有
効に使イつれる熱Ｑａｌ＝Ｑｄｌと周囲に逃げる熱Ｑａ
２〜Ｑｄ２に分かれ、インク面８の加熱に有効に使われ
る熱量Ｑａｌ＝Ｑｄｌの発熱量Ｑａ〜Ｑｄに対する割合
は抵抗体の幅が広い程大きくなる。言い換えれば、発熱
抵抗体３ａ〜３ｄの幅が狭い程無駄になる熱量の割合が
大きくなる。However, in reality, the heat Qa = Qd is the heat Qal = Qdl that is effectively used to heat the ink surface 8, and the heat Qa that escapes to the surroundings.
The ratio of the amount of heat Qal=Qdl effectively used for heating the ink surface 8 to the amount of heat generation Qa to Qd increases as the width of the resistor increases. In other words, the narrower the width of the heating resistors 3a to 3d, the greater the proportion of wasted heat.
従って、第１電極４ａから発熱抵抗体３ａ〜３ｄを介し
て第２電極４ｂに電流を流した場合、インク面８の加熱
ｍは、最も幅の広い抵抗体３ｄに面した部分が最大とな
り、以下、３ｃ→３ｂ→３ａに各４面した部分の順に小
さくなる。Therefore, when a current is passed from the first electrode 4a to the second electrode 4b via the heating resistors 3a to 3d, the heating m of the ink surface 8 is maximum at the part facing the widest resistor 3d. Thereafter, the four-sided portions become smaller in the order of 3c → 3b → 3a.
ところで、インクが溶融するのには一定の熱エネルギー
を必要とする。従って、発熱抵抗体３ａ〜３ｄに流す電
流のａ電時間あるいは波高値がある範囲内の場合は、幅
の大きな発熱抵抗体３ｄに面したインク面の加熱量のみ
がインクを溶融せしめろ熱エネルギーに達し、インクが
溶融され、発熱抵抗体３ａ〜３ｄに流す電流の通電時間
あるいは波高値を上記の範囲より大にすると、発熱抵抗
体３ｄよりら幅の小さな発熱抵抗体に而したインク面の
加熱量もインクを溶融せしめる熱エネルギーに達し、イ
ンクが溶融される。By the way, a certain amount of thermal energy is required to melt ink. Therefore, if the electric time or peak value of the current flowing through the heating resistors 3a to 3d is within a certain range, only the heating amount of the ink surface facing the wide heating resistor 3d melts the ink, and the thermal energy is When the current flow time or peak value of the current flowing through the heating resistors 3a to 3d is made larger than the above range, the ink surface becomes smaller than that of the heating resistor 3d. The amount of heating also reaches a thermal energy that melts the ink, and the ink is melted.
すなわち、発熱抵抗体に流す電流の通電時間あるいは波
高値を変える事により、インク面の溶融する範囲を制御
する事ができ、第３図に示すように被転写用紙に転写さ
れるドツトの大きさを（ａ）。In other words, by changing the duration or peak value of the current flowing through the heating resistor, the melting range of the ink surface can be controlled, and the size of the dots transferred to the transfer paper can be controlled as shown in Figure 3. (a).
（ｂ） 、 （ｃ、） 、 （ｄ）の４通りに変える事
ができる。It can be changed in four ways: (b), (c,), and (d).
また、第４図はこの発明の第２の実施例であり、第１図
のように発熱抵抗体を完全に分割するのでなく、発熱抵
抗体に電極まで到達しない切り込みを入れている。この
場合も、電流を切り込みを境に分流させる事ができ、第
１の実施例と同様の効果かある。Further, FIG. 4 shows a second embodiment of the present invention, in which the heating resistor is not completely divided as in FIG. 1, but a cut is made in the heating resistor that does not reach the electrode. In this case as well, the current can be divided across the notch, and the same effect as in the first embodiment can be obtained.
［発明の効果］
以上説明したようにこの発明によれば、発熱抵抗体に第
１電極から第２電極に至る向きに平行して走る境界部を
形成し、この境界部の発熱抵抗体を除去し、各々幅の異
なる複数の発熱抵抗体を形成したので、発熱抵抗体へ流
す電流の通電時間またはその波高値を制御することによ
りインクの溶融範囲を制御でき、印刷されるドツトの大
きさを制御することができる。[Effects of the Invention] As explained above, according to the present invention, a boundary portion running in parallel from the first electrode to the second electrode is formed in the heating resistor, and the heating resistor at this boundary portion is removed. However, by forming a plurality of heating resistors each having a different width, the melting range of the ink can be controlled by controlling the duration or peak value of the current flowing through the heating resistors, and the size of the printed dots can be controlled. can be controlled.
第１図はこの発明の一実施例の構成を示す平面図、第２
図は第１図の■−■線断面図、第３図はこの発明のサー
マルヘッドにおいて熱転写されるドツトの形状を示す図
、第４図はこの発明の第２の実施例を示す平面図、第５
図は従来のサーマルヘッドを示す断面図、第６図は同サ
ーマルヘッドの平面図である。
ｌ・・・・・・基板、２・・・・・・ガラスゲレース層
（熱絶縁層）、３ ａ、３ ｂ、３ ｃ、３ ｄ・・・
・・・発熱抵抗体、４ａ・・・・・・第１電極、４ｂ・
・・・・・第２電極、５・・・・・・耐酸化膜、６・・
・・・・耐摩耗膜（５，６は保護層を構成する）。FIG. 1 is a plan view showing the configuration of an embodiment of the present invention, and FIG.
The figure is a sectional view taken along the line ■-■ in FIG. 1, FIG. 3 is a diagram showing the shape of the dots thermally transferred in the thermal head of the present invention, and FIG. 4 is a plan view showing a second embodiment of the present invention. Fifth
The figure is a sectional view showing a conventional thermal head, and FIG. 6 is a plan view of the same thermal head. 1... Substrate, 2... Glass gelase layer (thermal insulation layer), 3 a, 3 b, 3 c, 3 d...
...Heating resistor, 4a...First electrode, 4b.
...Second electrode, 5...Oxidation-resistant film, 6...
...Wear-resistant film (5 and 6 constitute a protective layer).
Claims (1)
発熱抵抗体と、この発熱抵抗体に電流を供給する第１電
極、第２電極と、表面を保護する保護層とが順次積層さ
れてなるサーマルヘッドにおいて、前記発熱抵抗体に前
記第１電極から前記第２電極に至る向きに平行して走る
境界部を形成し、この境界部の前記発熱抵抗体を除去し
、各々幅の異なる複数の発熱抵抗体を形成した事を特徴
とするサーマルヘッド。A heat insulating layer is formed on the surface of the substrate, and a heat generating resistor made of a resistive film, a first electrode and a second electrode that supply current to the heat generating resistor, and a protective layer that protects the surface are sequentially laminated on the heat insulating layer. In the thermal head, a boundary portion running parallel to the first electrode to the second electrode is formed on the heating resistor, and the heating resistor at this boundary portion is removed, and each of the heating resistors has a different width. A thermal head characterized by forming multiple heating resistors.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25676687A JPH0199862A (en) | 1987-10-12 | 1987-10-12 | Thermal head |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25676687A JPH0199862A (en) | 1987-10-12 | 1987-10-12 | Thermal head |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0199862A true JPH0199862A (en) | 1989-04-18 |
Family
ID=17297148
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP25676687A Pending JPH0199862A (en) | 1987-10-12 | 1987-10-12 | Thermal head |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0199862A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5375745A (en) * | 1991-09-05 | 1994-12-27 | Ing. Erich Pfeiffer Gmbh & Co. Kg | Media dispenser with initial pressure-relief state |
| JP2002370397A (en) * | 2001-06-13 | 2002-12-24 | Sii P & S Inc | Thermal head |
-
1987
- 1987-10-12 JP JP25676687A patent/JPH0199862A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5375745A (en) * | 1991-09-05 | 1994-12-27 | Ing. Erich Pfeiffer Gmbh & Co. Kg | Media dispenser with initial pressure-relief state |
| JP2002370397A (en) * | 2001-06-13 | 2002-12-24 | Sii P & S Inc | Thermal head |
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