JPS6345063A - Thermal head - Google Patents
Thermal headInfo
- Publication number
- JPS6345063A JPS6345063A JP18925386A JP18925386A JPS6345063A JP S6345063 A JPS6345063 A JP S6345063A JP 18925386 A JP18925386 A JP 18925386A JP 18925386 A JP18925386 A JP 18925386A JP S6345063 A JPS6345063 A JP S6345063A
- Authority
- JP
- Japan
- Prior art keywords
- thermal head
- resistors
- thermal
- heating
- heating 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.)
- Granted
Links
- 238000010438 heat treatment Methods 0.000 claims description 52
- 239000000758 substrate Substances 0.000 claims description 5
- 238000000034 method Methods 0.000 abstract 1
- 239000004020 conductor Substances 0.000 description 8
- 238000010586 diagram Methods 0.000 description 3
- 238000003491 array Methods 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000003247 decreasing effect Effects 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】
（イ）産業上の利用分野
この発明は、サーマルヘッド、特に発熱抵抗体の配列に
特徴を有するサーマルヘッドに関する。DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a thermal head, and particularly to a thermal head characterized by the arrangement of heating resistors.
（ロ）従来の技術
従来よりよく知られたサーマルヘッドとして、第４図に
示すように、セラミック等の基板１１上に一列に、複数
の発熱抵抗体１２−＋、１２−ｚ、・・・、１２１が配
列され、さらにこれら複数の発熱抵抗体１２−い１２−
２、・・・、１２．のそれぞれに共通に接続される共通
電極パターン導体１３と、前記各発熱抵抗体１２−１１
２−２、・・・、１２．のそれぞれに個別に接続される
個別接続パターン１４−１１４−２、・・・、１４−３
が形成されたものである。(B) Prior Art As a conventionally well-known thermal head, as shown in FIG. 4, a plurality of heating resistors 12-+, 12-z, . . . are arranged in a row on a substrate 11 made of ceramic or the like. , 121 are arranged, and a plurality of heating resistors 12-12-
2,...,12. a common electrode pattern conductor 13 commonly connected to each of the heating resistors 12-11;
2-2,...,12. Individual connection patterns 14-114-2, ..., 14-3 that are individually connected to each of the
was formed.
（ハ）発明が解決しようとする問題点
上記従来のサーマルヘッドの各発熱抵抗体のドツト面積
及びそのピッチは均一であるため、第３図に示すように
、発熱抵抗体列の両端はど表面温度が低く、中央が温度
が高いため、印字動作時に、両端部の印字が中央部に比
して薄（なるという問題があった。(c) Problems to be Solved by the Invention Since the dot area and pitch of each heating resistor in the conventional thermal head are uniform, as shown in FIG. Since the temperature is low and the temperature is high in the center, there was a problem that during printing operation, the print at both ends became thinner than the center.
この発明は、上記に鑑み、複数の発熱抵抗体が配列され
てなる発熱抵抗体列の表面温度が均一となるサーマルヘ
ッドを提供することを目的としている。SUMMARY OF THE INVENTION In view of the above, an object of the present invention is to provide a thermal head in which the surface temperature of a heat generating resistor array formed by arranging a plurality of heat generating resistors is uniform.
（ニ）問題点を解決するための手段及び作用この発明の
サーマルヘッドは、上記問題点を解決するために、表面
温度が特に顕著に中央部に比して低いのは、両端の発熱
抵抗体の数個分であることに着目し、基板上に複数の発
熱抵抗体が一列に配列された発熱抵抗体列と、この発熱
抵抗体の各々に通電するための共通電極及び個別電極が
形成されてなるサーマルヘッドにおいて、前記発熱抵抗
体列の列両端より中央に向けて、少なくとも数個の発熱
抵抗体の抵抗値が順次大きくなるように、特徴的に構成
している。(d) Means and operation for solving the problems In order to solve the above problems, the thermal head of the present invention has the following features: The heating resistors at both ends have a surface temperature that is particularly significantly lower than that at the center. Focusing on the fact that the number of heat generating resistors is several, a heat generating resistor row in which a plurality of heat generating resistors are arranged in a row is formed on the substrate, and a common electrode and individual electrodes for supplying current to each of the heat generating resistors are formed. The thermal head is characterized in that the resistance value of at least some of the heating resistors increases sequentially from both ends of the heating resistor row toward the center.
このサーマルヘッドでは、中央部よりも両端にいくに従
い、抵抗値が小さくなるように形成されているので、両
端の発熱抵抗体、つまりドツトはど電力配分が大となり
、その分、表面温度が上昇され、各発熱抵抗体上におい
て路間−の表面温度を得ることができ、このような状態
下で各ドツトを印字すると、平均したドツト印字を行う
ことができる。This thermal head is formed so that the resistance value decreases toward both ends from the center, so the power distribution to the heating resistors, or dots, at both ends is large, and the surface temperature rises accordingly. Therefore, the surface temperature between the paths can be obtained on each heating resistor, and if each dot is printed under such conditions, an average dot can be printed.
（ホ）実施例
以下、実施例により、この発明をさらに詳細に説明する
。(E) Examples The present invention will be explained in more detail with reference to Examples below.
第１図は、この発明の一実施例を示すサーマルヘッドの
平面図である。FIG. 1 is a plan view of a thermal head showing an embodiment of the present invention.
この実施例サーマルヘッドは、基板１上に複数の発熱抵
抗体２−い２−２、・・・、２−８が配列され、これら
発熱抵抗体２−１．２−２、・・・、２−３の一方端に
は共通電極導体パターン３が、また他方端には個別電極
導体パターン４−１．４−２、・・・、４−、ａが形成
されてなるものであり、この基本構成において、第４図
に示した従来のものと同一である。In the thermal head of this embodiment, a plurality of heating resistors 2-1, 2-2, . . . , 2-8 are arranged on a substrate 1, and these heating resistors 2-1, 2-2, . A common electrode conductor pattern 3 is formed at one end of 2-3, and individual electrode conductor patterns 4-1, 4-2, . . . , 4-, a are formed at the other end. The basic configuration is the same as the conventional one shown in FIG.
この実施例サーマルヘッドは、各発熱抵抗体２−０．２
−ｚ、・・・、２−３の各ドツト毎の発熱抵抗体パター
ンに特徴がある。つまり、両端の発熱抵抗体２．．１．
２−８は、従来と同様に、１ドツトに１個の発熱抵抗体
パターンで形成されているが、両端より内側の第２番目
の発熱抵抗体２−２．２−７は、１ドツト分が２個の発
熱抵抗体に分割されて、例えばドツト２−２については
、２−０と２−２１＋の２個に、つまり共通電極導体パ
ターン３と個別電極導体パターン４−ｆｆｉ間に、それ
ぞれが互いに分離された発熱抵抗体２−Ｚｎ 、２−２
ｋが並列に接続されたものとなっている。さらに、両端
より３列目以降の中央よりの発熱抵抗体２−３．１４、
・・・、２−６については、各発熱抵抗体が３個に分割
され、例えば発熱抵抗体２−３のドツトは、２−３ｍ
、２−３１１．２−３ｃに分割され、共通電極導体パタ
ーン３と個別電極導体パターン４−３間に分割された３
個の発熱抵抗体２−３ａ、２−：ｌｂ 、２−３ｃが、
並列に接続されて構成されている。This embodiment thermal head has each heating resistor 2-0.2.
-z, . . . , 2-3 are characterized by the pattern of the heating resistor for each dot. In other words, the heating resistors 2 at both ends. ．． 1.
2-8 is formed with one heating resistor pattern per dot, as in the past, but the second heating resistor 2-2, 2-7 located inside from both ends has a pattern of one dot. is divided into two heating resistors, for example, for dot 2-2, there are two heating resistors, 2-0 and 2-21+, that is, between the common electrode conductor pattern 3 and the individual electrode conductor pattern 4-ffi. heating resistors 2-Zn, 2-2 separated from each other;
k are connected in parallel. Furthermore, heating resistors 2-3.14 from the center of the third row and beyond from both ends,
..., 2-6, each heating resistor is divided into three pieces, for example, the dot of heating resistor 2-3 is 2-3 m long.
, 2-311.2-3c, and divided between the common electrode conductor pattern 3 and the individual electrode conductor pattern 4-3.
The heating resistors 2-3a, 2-:lb, 2-3c are
They are connected in parallel.
もっとも、各発熱抵抗体２−１．２−２、・・・、２゜
の全体ドツト輪郭パターンの面積、つまり各ドツトパタ
ーンが形成する外側の占有面積は、全く同一である。し
かし、同じシート抵抗の発熱抵抗体を使用するものであ
るため、１ドツト−１発熱抵抗体の２−３と２−８は抵
抗値が低くなり、次に２分割される発熱抵抗体２−２．
２−１が、その両端の発熱抵抗体１．．２−、の抵抗値
より若干高くなり、さらに中央部の発熱抵抗体２４．２
−４、・・・、２−６は、３個に分割されているので、
さらに抵抗値が高くなる。その結果、両端の発熱抵抗体
の抵抗値が一番低く、次の２番目がやや高く、３番目が
最も高くなるという抵抗値配分になり、逆に、配分され
る電力パワーは両端はど大となる。その結果、この抵抗
値の配分比を調整することにより、この実施例サーマル
ヘッドの表面温度は、第２図に示すように、ドツト配列
上をとってみると、略均−となり、このような表面温度
を硼保し得る状態で印字動作を行うと、印字両端の濃度
が従来のように中央部より薄くならず、略同濃度の印字
を行うことができる。However, the area of the entire dot contour pattern of each heating resistor 2-1, 2-2, . However, since heating resistors with the same sheet resistance are used, the resistance values of 1-dot-1 heating resistors 2-3 and 2-8 are lower, and the resistance values of heating resistors 2-8, which are divided into two, are lower. 2.
2-1 is the heating resistor 1 at both ends. ．． 2-, the resistance value is slightly higher than that of the heating resistor 24.2 in the center.
-4, ..., 2-6 are divided into three parts, so
Furthermore, the resistance value becomes higher. As a result, the resistance value of the heating resistor at both ends is the lowest, the second one is slightly higher, and the third one is the highest. becomes. As a result, by adjusting the distribution ratio of this resistance value, the surface temperature of the thermal head of this embodiment becomes approximately equal when taken on the dot array as shown in FIG. If the printing operation is performed in a state where the surface temperature can be maintained, the density at both ends of the print will not become lighter than the center as in the conventional case, and printing can be performed with approximately the same density.
なお、上記実施例において、発熱抵抗体の個数は８個に
しているが、この発明では、もちろんこの個数に限定さ
れるものではない。In the above embodiment, the number of heating resistors is eight, but the present invention is of course not limited to this number.
また、実施例では、両端より３個の発熱抵抗体について
それぞれ抵抗値が順次増加するように形成じでいるが、
発熱抵抗体列の個数が多いサーマルヘッドにおいては、
さらにこの順次抵抗値を大きくしていく個数を変更でき
るこというまでもない。In addition, in the embodiment, the three heating resistors are formed so that their resistance values increase sequentially from both ends.
In a thermal head with a large number of heating resistor rows,
Furthermore, it goes without saying that the number of resistors whose resistance values are increased sequentially can be changed.
また、上記実施例においては、シート抵抗の同一のもの
を用い、その分割個数を変える場合を例に上げて説明し
たが、各発熱抵抗体のパターン面積を変えずに、中央の
発熱抵抗体はど膜厚が小さくなるようにして、抵抗値が
大きくなるように構成してもよい。In addition, in the above embodiment, the case where sheet resistance is the same and the number of divisions is changed is given as an example. However, without changing the pattern area of each heating resistor, the central heating resistor can be Alternatively, the resistance value may be increased by decreasing the film thickness.
くべ）発明の効果
この発明によれば、複数個の発熱抵抗体が一列に配列さ
れるサーマルヘッドにおいて、両端より中央に向けて、
それぞれ数個の発熱抵抗体の抵抗値を順次大きくなるよ
うにしているので、発熱抵抗体で消費されるパワーは両
端はど大となり、従って、各発熱抵抗体の表面温度を略
均−とすることができ、これらの発熱抵抗体列によって
印字される各ドツトの印字濃度は、路間−のものを得る
ことができる。According to the present invention, in a thermal head in which a plurality of heating resistors are arranged in a row, the heating resistors are arranged from both ends toward the center.
Since the resistance value of each heating resistor is made to increase successively, the power consumed by the heating resistor is greater at both ends, and therefore the surface temperature of each heating resistor is approximately equal to -. Therefore, the printing density of each dot printed by these heating resistor arrays can be obtained between the lines.
また、このような構成を持つシリアルヘッドをビデオプ
リンタ等に用いる場合には、発熱抵抗体両端の印字が薄
くなるために生じる白筋等は、完全に除去することがで
きる。Furthermore, when a serial head having such a configuration is used in a video printer or the like, white streaks and the like that occur due to thin printing on both ends of the heating resistor can be completely removed.
第１図は、この発明の一実施例を示すサーマルヘッドの
平面図、第２図は、同実施例の表面温度の分布状態を説
明するための図、第３図は、従来のサーマルヘッドの表
面温度の分布状態を説明するための図、第４図は、従来
のサーマルヘッドの平面図である。
ｌ：基板、
Ｌ、・２４・・・・・・２−３：発熱抵抗体、３：共通
電極導体パターン、FIG. 1 is a plan view of a thermal head showing an embodiment of the present invention, FIG. 2 is a diagram for explaining the surface temperature distribution of the same embodiment, and FIG. 3 is a diagram of a conventional thermal head. FIG. 4, which is a diagram for explaining the surface temperature distribution state, is a plan view of a conventional thermal head. l: substrate, L, 24...2-3: heating resistor, 3: common electrode conductor pattern,
Claims (2)
発熱抵抗体列と、この発熱抵抗体の各々に通電するため
の共通電極及び個別電極が形成されてなるサーマルヘッ
ドにおいて、 前記発熱抵抗体列の列両端より中央に向けて、少なくと
も数個の発熱抵抗体の抵抗値が順次大きくなるようにし
たことを特徴とするサーマルヘッド。(1) A thermal head in which a heating resistor row in which a plurality of heating resistors are arranged in a row, and a common electrode and individual electrodes for supplying current to each of the heating resistors are formed on a substrate, as described above. 1. A thermal head characterized in that the resistance values of at least several heating resistors are made to increase sequentially from both ends of the row of heating resistors toward the center.
各個別電極に応じて接続される発熱抵抗体は、電極方向
に分割形成される個数を中央部に向けて順次多くしたも
のである特許請求の範囲第１項記載のサーマルヘッド。(2) The heating resistors connected to at least several individual electrodes from both ends of the heating resistor row are divided in the direction of the electrodes, and the number of the heating resistors is gradually increased toward the center. A thermal head according to claim 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18925386A JPH0733102B2 (en) | 1986-08-11 | 1986-08-11 | Thermal head |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18925386A JPH0733102B2 (en) | 1986-08-11 | 1986-08-11 | Thermal head |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6345063A true JPS6345063A (en) | 1988-02-26 |
| JPH0733102B2 JPH0733102B2 (en) | 1995-04-12 |
Family
ID=16238195
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP18925386A Expired - Lifetime JPH0733102B2 (en) | 1986-08-11 | 1986-08-11 | Thermal head |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0733102B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0393142U (en) * | 1990-01-11 | 1991-09-24 |
-
1986
- 1986-08-11 JP JP18925386A patent/JPH0733102B2/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0393142U (en) * | 1990-01-11 | 1991-09-24 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0733102B2 (en) | 1995-04-12 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |