JPH0375156A - Thermal head - Google Patents
Thermal headInfo
- Publication number
- JPH0375156A JPH0375156A JP21175689A JP21175689A JPH0375156A JP H0375156 A JPH0375156 A JP H0375156A JP 21175689 A JP21175689 A JP 21175689A JP 21175689 A JP21175689 A JP 21175689A JP H0375156 A JPH0375156 A JP H0375156A
- Authority
- JP
- Japan
- Prior art keywords
- resistors
- common electrode
- selectively
- picture
- heating
- 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 38
- 239000000463 material Substances 0.000 claims abstract description 9
- 238000012937 correction Methods 0.000 abstract description 10
- 230000020169 heat generation Effects 0.000 abstract description 4
- 230000000875 corresponding effect Effects 0.000 abstract 2
- 238000010586 diagram Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 2
- 201000001880 Sexual dysfunction Diseases 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 239000000155 melt Substances 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〕
本発明はファクシミリ、プリンタ等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 facsimiles, printers, etc.
〔従来の技術］
従来、サーマルプリンタに用いられていた代表的なサー
マルヘッドとして、特開昭５３−８７２４０号公報に記
載されている抵抗体にスリットを入れた発熱抵抗体を有
するものや、特開昭５２−１４２５２７号公報に記載さ
れている抵抗体をミアンダ状にした発熱抵抗体を有する
ものがある。[Prior Art] Typical thermal heads conventionally used in thermal printers include those having a heating resistor with a slit in the resistor described in Japanese Patent Application Laid-Open No. 53-87240, and There is one which has a heating resistor which is a meandering resistor described in JP-A-52-142527.
上記サーマルヘッドにあっては２つの隣接するドツトを
印写する場合に２つの隣合う発熱抵抗体を同時に発熱さ
せると、この２つの発熱抵抗体の熱の相互作用により印
写画像濃度又はドツトの大きさが正規のものより大きく
なる。このため、２つの隣合う発熱抵抗体を同時に発熱
させる場合■２つの隣合う発熱抵抗体の駆動タイミング
を変え、■２つの隣合う発熱抵抗体の印加電力を小さく
する等の補正を行なって印写画像濃度、ドツトの大きさ
を常に正規のものとする補正手段が必要になる。In the above thermal head, when two adjacent dots are printed, if two adjacent heating resistors are made to generate heat at the same time, the printed image density or dots will change due to the interaction of the heat of these two heating resistors. The size is larger than the regular one. Therefore, when two adjacent heating resistors are made to generate heat at the same time, it is necessary to make corrections such as: ■ changing the drive timing of the two adjacent heating resistors, and ■ reducing the applied power to the two adjacent heating resistors. A correction means is required to always maintain the photographed image density and dot size as normal.
特に、抵抗体をミアンダ状にした発熱抵抗体を有するサ
ーマルヘッドでは構造が複雑であるので、製造精度の点
で各発熱抵抗体の間でバラツキが出やすくて印写画像品
質が悪くなり、信頼性に問題がある。In particular, thermal heads with meandering heating resistors have a complex structure, so variations in manufacturing accuracy tend to occur between each heating resistor, resulting in poor printed image quality and reliability. I have a sexual problem.
本発明は上記欠点を改善し、構造が簡単で上記補正手段
が不要となるサーマルヘッドを提供することを目的とす
る。SUMMARY OF THE INVENTION It is an object of the present invention to provide a thermal head which improves the above-mentioned drawbacks, has a simple structure, and does not require the above-mentioned correction means.
上記目的を達成するため、請求項１の発明は記録幅方向
に一列に配置されて一体に設けられた複数個の発熱抵抗
体と、この複数個の発熱抵抗体の片側に接続される共通
電極と、前記複数個の発熱抵抗体に個別に接続される複
数個の電極とを有し、この複数個の電極と前記共通電極
との各間に選択的に電位差を与えて前記複数個の発熱抵
抗体を選択的に発熱させ、この発熱により画像の印写を
行なうサーマルヘッドにおいて、前記発熱抵抗体を電気
伝導度が異なる２種類の材料により構成したものであり
、
請求項２の発明は請求項１記載のサーマルヘッドにおい
て、前記２種類の材料を記録幅方向に交互に配置したも
のである。In order to achieve the above object, the invention of claim 1 includes a plurality of heating resistors arranged in a row in the recording width direction and provided integrally, and a common electrode connected to one side of the plurality of heating resistors. and a plurality of electrodes individually connected to the plurality of heating resistors, and selectively applying a potential difference between the plurality of electrodes and the common electrode to generate the plurality of heat generation. In a thermal head that selectively generates heat in a resistor and prints an image using the heat generated, the heat generating resistor is made of two types of materials having different electric conductivities, In the thermal head according to Item 1, the two types of materials are alternately arranged in the recording width direction.
複数個の電極と共通電極との各間に選択的に電位差が与
えられることにより、複数個の発熱抵抗体が選択的に発
熱し、この発熱により画像の印写が行なわれる。By selectively applying a potential difference between the plurality of electrodes and the common electrode, the plurality of heating resistors selectively generate heat, and an image is printed by this heat generation.
第１図は本発明の一実施例を示し、図中１は共通電極、
２は比抵抗（電気伝導度）がρ、である材料からなる抵
抗体、３は比抵抗がρ２（≠ρ、）である材料からなる
抵抗体、４は電極である。FIG. 1 shows an embodiment of the present invention, in which 1 is a common electrode;
2 is a resistor made of a material whose specific resistance (electrical conductivity) is ρ, 3 is a resistor made of a material whose specific resistance is ρ2 (≠ρ,), and 4 is an electrode.
抵抗体２，３は１ライン分の画像印写を行なう複数個の
抵抗体・・・２ ｎ−１，２ｎ、 ２ ｎ＋１・・・、
・・・３ｎ−１，３ｎ、３ｎ＋１・・・を交互に記録幅
方向へ配列して一体に設けたものからなり、１組で１つ
の発熱抵抗体を構成する。この一体に設けられた抵抗体
・・・２ｎ−１，２ｎ、 ２ｎ＋１・・・ ・・・３
ｎ−１，３ｎ、 ３ ｎ＋１・・・の片側には共通電極
１が接続され、共通電極１に直流電源５が接続される。The resistors 2 and 3 are a plurality of resistors for printing one line of image...2 n-1, 2n, 2 n+1...,
. . 3n-1, 3n, 3n+1, . . . are arranged alternately in the recording width direction and provided integrally, and one set constitutes one heating resistor. This integrally provided resistor...2n-1, 2n, 2n+1...3
A common electrode 1 is connected to one side of n-1, 3n, 3 n+1, and so on, and a DC power source 5 is connected to the common electrode 1.
抵抗体２，３は一定の長さＣを有し、かつ抵抗体・・・
３ ｎ−１，３ｎ、 ３ ｎ＋１・・・が一定の幅ａを
有し、抵抗体・・・２ｎ−１，２ｎ、２ｎ＋１・・・が
一定の幅すを有する。電極４は１ライン分のドツトに対
応した複数個の電極・・・４ｎ−１，４ｎ、４ｎ＋１・
・・からなり、これらの電極・・・４ｎ−１，４ｎ、４
ｎ＋１・・・は抵抗体・・・２ｎ−１，２ｎ、 ２ｎ＋
１・・・の下側にそれぞれ接続される。スイッチ・・・
６ ｎ−１，６ｎ、 ６ ｎ＋１・・・は画像信号によ
り、印写すべき画像に応じて選択的に開閉されるもので
あり、電極・・・４ ｎ−１，４ｎ。The resistors 2 and 3 have a constant length C, and the resistors...
3n-1, 3n, 3n+1... have a constant width a, and the resistors...2n-1, 2n, 2n+1... have a constant width a. The electrode 4 is a plurality of electrodes corresponding to one line of dots...4n-1, 4n, 4n+1.
These electrodes...4n-1, 4n, 4
n+1... is a resistor...2n-1, 2n, 2n+
1... are connected to the lower side of each. switch···
6 n-1, 6n, 6 n+1... are selectively opened and closed according to the image to be printed by image signals, and electrodes...4 n-1, 4n.
４ｎ＋１・・・とアースとの各間にそれぞれ接続される
。4n+1... and the ground, respectively.
スイッチ・・・６ ｎ−１，６ｎ、 ６ ｎ＋１・・・
が画像信号により選択的に開閉されると、抵抗体・・・
２ｎ−１，２ｎ。Switch...6 n-1, 6n, 6 n+1...
When the is selectively opened and closed by the image signal, the resistor...
2n-1, 2n.
２ｎ＋１・・・の下側がそれぞれ電極・・・４ｎ−１，
４ｎ、４ｎ＋１・・・、スイッチ・・・６ ｎ−１，６
ｎ、 ６ ｎｉｌ・・・を介して選択的にアースされる
。抵抗体・・・２ｎ−１，２ｎ、 ２ｎ＋１・・・ ・
・・３ ｎ−１，３ｎ、 ３ ｎ＋１・・・の上側には
共通電極１を介して直流電源５から一定の電圧Ｖが印加
されている。したがって、抵抗体・・・２ｎ−１，２ｎ
。The lower side of 2n+1... is the electrode...4n-1,
4n, 4n+1..., switch...6 n-1,6
selectively grounded via n, 6 nil... Resistor...2n-1, 2n, 2n+1... ・
A constant voltage V is applied from the DC power supply 5 to the upper side of 3 n-1, 3 n, 3 n+1, . . . via the common electrode 1. Therefore, resistor...2n-1, 2n
.
２ｎ＋１”・ ”・３ｎ−１，３ｎ、３ｎ＋１”・は画
像信号に応じて電位差が与えられて発熱し、この発熱に
よりその近傍に設けられているインクシートの一部を溶
融あるいは昇華させて被印写物に付着させることによっ
て１ライン分の画像印写を行なう。そして被印写物が移
動し、かつスイッチ・・・６ｎ−１゜６ｎ、６ｎ＋１・
・・が各ラインの画像信号で順次に開閉されることによ
り複数ライン分の画像印写が行なわれる。2n+1", 3n-1, 3n, 3n+1" generates heat when a potential difference is applied in response to the image signal, and this heat melts or sublimates a part of the ink sheet provided in the vicinity and covers it. One line of image is printed by attaching it to the printing object.Then, the printing object moves and the switch...6n-1°6n, 6n+1.
. . are sequentially opened and closed in accordance with the image signal of each line, thereby printing images for a plurality of lines.
第２図はこの実施例の集中定数モデルを示し、抵抗体”
・２ｎ−１，２ｎ、 ２ｎ＋１・・・”・３ｎ−１，３
ｎ、 ３ｎ＋１・・・は共通電極１と電極・・・４ ｎ
−１，４ｎ、 ４ ｎ＋１・・・との各間の抵抗ｒ工と
、各電極・・・４ｎ−１，４ｎ、４ｎ＋１・・・間の抵
抗ｒ２で表わすことができる。Figure 2 shows the lumped constant model of this example, and shows the resistor "
・2n-1, 2n, 2n+1..."・3n-1, 3
n, 3n+1... are common electrode 1 and electrode...4 n
-1, 4n, 4n+1, . . . and resistance r2 between each electrode, 4n-1, 4n, 4n+1, .
今、例えばｎ番目のスイッチ６ｎがオンすると、第１図
のハツチング部分ｉの電流密度が特に大きくなり、ｎ番
目の発熱抵抗体はこの部分ｉを中心として発熱する。こ
の時のｎ番目の発熱抵抗体の発熱量を９０とする。また
、 ｎ−１、ｎ 、 ｎ ＋ １番目のスイッチ６ｎ−
１，６ｎ、６ｎ＋１が同時にオンした時におけるｎ番目
の発熱抵抗体の発熱量をｑ□とする。Now, for example, when the n-th switch 6n is turned on, the current density in the hatched portion i in FIG. 1 becomes particularly large, and the n-th heating resistor generates heat centered on this portion i. The amount of heat generated by the n-th heating resistor at this time is assumed to be 90. Also, n-1, n, n + 1st switch 6n-
Let q□ be the amount of heat generated by the n-th heating resistor when resistors 1, 6n, and 6n+1 are turned on at the same time.
従来のサーマルヘッドではｎ番目の発熱抵抗体の発熱量
ｑｏｗ ｑＬは常にｑｏ＝ｑｔであり、ｎ番目の発熱抵
抗体に隣接した発熱抵抗体の発熱に影響されて注目ドツ
ト（ｎ番目の発熱抵抗体により印写されたドツト）の濃
度又は大きさはｎ番目の発熱抵抗体に隣接した発熱抵抗
体が発熱しない場合に比べて大きくなる。そこで、補正
手段によりｑＯ＝αｑｉ（０＜αく１）となるように発
熱抵抗体への通電電圧あるいは通電時間を制御して印写
画像濃度、ドツトの大きさを常に正規のものとする必要
があった。ここに、係数αは実験あるいは計算により比
較的簡単に導出することができる。In a conventional thermal head, the amount of heat qow qL of the n-th heating resistor is always qo = qt, and the dot of interest (n-th heating resistor The density or size of the dots printed by the n-th heating resistor is larger than that in the case where the heating resistor adjacent to the n-th heating resistor does not generate heat. Therefore, it is necessary to control the energizing voltage or energizing time to the heating resistor using a correction means so that qO=αqi (0<α×1) so that the printed image density and dot size are always normal. was there. Here, the coefficient α can be derived relatively easily by experiment or calculation.
この実施例では上記補正手段による発熱抵抗体への通電
電圧あるいは通電時間の制御を行なうことなく、ｑｏ”
αｑよとしている。第３図はこの実施例におけるｒｚ／
ｒｘとｑｓ／ｑｏとの関係を示す。In this embodiment, qo''
I'm trying to do αq. Figure 3 shows the rz/
The relationship between rx and qs/qo is shown.
ｒ２ ／ ｒ １が小さいと、ｎ番目の発熱抵抗体の発
熱量はｎ番目の発熱抵抗体に隣接した発熱抵抗体の発熱
による影響が大きくなり、その結果ｑｘ／ｑ。When r2/r1 is small, the amount of heat generated by the n-th heating resistor is greatly influenced by the heat generated by the heating resistor adjacent to the n-th heating resistor, and as a result, qx/q.
は小さくなる。また、ｎ番目の発熱抵抗体の発熱量はｒ
２ ／ ｒ 、が大きくなればなるほどｎ番目の発熱
抵抗体に隣接した発熱抵抗体の発熱による影響が小さく
なり、その結果（Ｉｔ／ｑ１１は１に近づく。becomes smaller. Also, the amount of heat generated by the nth heating resistor is r
As 2/r becomes larger, the influence of heat generated by the heating resistor adjacent to the n-th heating resistor becomes smaller, and as a result, (It/q11 approaches 1).
従って、第３図の関係が分かれば適正な補正値αを満足
するｒ２／ｒ□（＝β）が分かる。そこで、この実施例
ではｒｌｌ ｒｉを調整してｒ ２ ／ ｒ 、＝βと
し、ｑｏ”αｑ１として上記補正手段を不要としている
。一方％ ｒｌｌ ｒ、を決める因子としては各抵抗体
２，３の幅ａ、ｂ（但しａ＋ｂは画素密度によって決め
られる）及び材料固有の値ρ１．ρ２がある。よって、
抵抗体２，３の比抵抗の比ρ１／ρ２及び幅の比ａ ／
ｂを適当に選ぶことによって上記補正手段による補正
が不要になる。Therefore, if the relationship shown in FIG. 3 is understood, r2/r□ (=β) that satisfies the appropriate correction value α can be found. Therefore, in this embodiment, rll ri is adjusted to be r 2 / r , = β, and the above correction means is unnecessary as qo''αq1.On the other hand, the factors that determine % rll r are the values of each resistor 2 and 3. There are widths a and b (however, a+b is determined by the pixel density) and material-specific values ρ1 and ρ2.Therefore,
Ratio of resistivity ρ1/ρ2 and width ratio a/ of resistors 2 and 3
By appropriately selecting b, the correction by the correction means described above becomes unnecessary.
〔発明の効果〕
以上のように請求項１及び請求項２の発明によれば記録
幅方向に一列に配置されて一体に設けられた複数個の発
熱抵抗体と、この複数個の発熱抵抗体の片側に接続され
る共通電極と、前記複数個の発熱抵抗体に個別に接続さ
れる複数個の電極とを有し、この複数個の電極と前記共
通電極との各間に選択的に電位差を与えて前記複数個の
発熱抵抗体を選択的に発熱させ、この発熱により画像の
印写を行なうサーマルヘッドにおいて、前記発熱抵抗体
を電気伝導度が異なる２種類の材料により構成したので
、構造が簡単であり、前記２種類の材料の定数２寸法を
選定することにより上記補正手段が不要となる。[Effects of the Invention] As described above, according to the inventions of claims 1 and 2, there are provided a plurality of heating resistors that are arranged in a line in the recording width direction and are integrally provided, and a plurality of heating resistors that are integrally provided. a common electrode connected to one side of the heating resistor, and a plurality of electrodes individually connected to the plurality of heating resistors, and selectively creating a potential difference between each of the plurality of electrodes and the common electrode. In the thermal head that selectively generates heat in the plurality of heating resistors by giving a is simple, and by selecting the two constant dimensions of the two types of materials, the correction means described above is not necessary.
第１図は本発明の一実施例を示す概略月、第２図は同実
施例の集中定数モデルを示す回路図、第３図は同実施例
を説明するための特性図である。
１・・・共通電極、２，３・・・抵抗体、４・・・電極
。FIG. 1 is a schematic diagram showing an embodiment of the present invention, FIG. 2 is a circuit diagram showing a lumped constant model of the embodiment, and FIG. 3 is a characteristic diagram for explaining the embodiment. 1... Common electrode, 2, 3... Resistor, 4... Electrode.
Claims (1)
数個の発熱抵抗体と、この複数個の発熱抵抗体の片側に
接続される共通電極と、前記複数個の発熱抵抗体に個別
に接続される複数個の電極とを有し、この複数個の電極
と前記共通電極との各間に選択的に電位差を与えて前記
複数個の発熱抵抗体を選択的に発熱させ、この発熱によ
り画像の印写を行なうサーマルヘッドにおいて、前記発
熱抵抗体を電気伝導度が異なる２種類の材料により構成
したことを特徴とするサーマルヘッド。 ２、請求項１記載のサーマルヘッドにおいて、前記２種
類の材料を記録幅方向に交互に配置したことを特徴とす
るサーマルヘッド。[Scope of Claims] 1. A plurality of heat generating resistors arranged in a line in the recording width direction and provided integrally, a common electrode connected to one side of the plurality of heat generating resistors, and a common electrode connected to one side of the plurality of heat generating resistors; a plurality of electrodes individually connected to the heating resistors, and selectively applying a potential difference between the plurality of electrodes and the common electrode to selectively connect the plurality of heating resistors. 1. A thermal head that generates heat and prints an image using the heat generated, characterized in that the heating resistor is made of two types of materials having different electrical conductivities. 2. The thermal head according to claim 1, wherein the two types of materials are alternately arranged in the recording width direction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21175689A JPH0375156A (en) | 1989-08-17 | 1989-08-17 | Thermal head |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21175689A JPH0375156A (en) | 1989-08-17 | 1989-08-17 | Thermal head |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0375156A true JPH0375156A (en) | 1991-03-29 |
Family
ID=16611061
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP21175689A Pending JPH0375156A (en) | 1989-08-17 | 1989-08-17 | Thermal head |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0375156A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5016449A (en) * | 1989-02-10 | 1991-05-21 | Savio, S.P.A. | Method of producing quality hosiery by changing stitch length in circular knitting machines and a device for its implementation |
-
1989
- 1989-08-17 JP JP21175689A patent/JPH0375156A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5016449A (en) * | 1989-02-10 | 1991-05-21 | Savio, S.P.A. | Method of producing quality hosiery by changing stitch length in circular knitting machines and a device for its implementation |
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