JPS6232058A - Thermal recording head - Google Patents

Thermal recording head

Info

Publication number
JPS6232058A
JPS6232058A JP17071885A JP17071885A JPS6232058A JP S6232058 A JPS6232058 A JP S6232058A JP 17071885 A JP17071885 A JP 17071885A JP 17071885 A JP17071885 A JP 17071885A JP S6232058 A JPS6232058 A JP S6232058A
Authority
JP
Japan
Prior art keywords
common conductor
conductor line
line
resistance
connection terminal
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
Application number
JP17071885A
Other languages
Japanese (ja)
Inventor
Hideki Obara
小原　東樹
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NEC Corp
Original Assignee
NEC Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by NEC Corp filed Critical NEC Corp
Priority to JP17071885A priority Critical patent/JPS6232058A/en
Publication of JPS6232058A publication Critical patent/JPS6232058A/en
Pending legal-status Critical Current

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
    • B41J2/35—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 providing current or voltage to the thermal head
    • B41J2/355—Control circuits for heating-element selection

Landscapes

  • Electronic Switches (AREA)

Abstract

PURPOSE:To eliminate printing irregularity, by providing the connection terminal of the external lead to a first common conductor line to both terminal parts of the first common conductor line and providing the connection terminal of the external line to a second common conductor line to the central part of the second common conductor line. CONSTITUTION:The equivalent resistance RH(x) in the side of a common conductor line 110 for a power source containing lead wires 111, 112 is imparted by a parallel circuit of a lefthand line resistor RH1(x) and a righthand line resistor RH2(x) and RH1(x) and RH2(x) are respectively monotone increasing and monotone decreasing functions to (x) and, therefore, the equivalent resistance RH(x) changes in a convex shaped secondary line form. The equivalent resistance RG(x) of a common conductor line for the ground shown concave shaped linear distribution in relation to (x) because there is a connection terminal at a central part and the value thereof comes to almost 1/2 or less. As a result, the synthetic resistance value RT(x) being the sum total of RH(x), RG(x), the resistance R(x) of a heat generator and the ON-resistance r(x) of drive IC shows distribution near to a constant value. As mentioned above, by altering the position of the connection terminal to the conductor line, an equivalent resistance sum is made constant to reduce printing irregularity and the production yield of a head can be enhanced.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 本発明はサーマルヘッドに関し、特に発熱抵抗体と直列
に継がる導体電極部分の抵抗のアンバランスによって生
じる印字ムラを少なくした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, and more particularly to a thermal head that reduces printing unevenness caused by unbalanced resistance of a conductive electrode portion connected in series with a heating resistor.

〔従来の技術〕[Conventional technology]

従来のサーマルヘッドは、例えば第３図に示すようにセ
ラミック基板２００上に、発熱抵抗体２２０と駆動ＩＣ
２３０の直列回路を電源用の共通導体ライン２１０とグ
ランド用共通導体ライン２４００間に複数個並列接続し
友ものである。この電源用の共通導体ライン２１０と外
部電源ライン２５０とは、リード線２１１，２１２を介
して各々端子２１３．２１４で接続されており、一方グ
ランド用の共通導体ライン２４０は外部グランドライン
２６０と接続端子２４１で接続されている。この様な構
造のサーマルヘラ本°において、外部電源ライン２０５
と外部グランドライン２６０との間の等価抵抗を、ヘッ
ドの左側から数えてＸ番目の駆動ＩＣが駆動された場合
について第４図（ａ）　、　（ｂ）に示す。ＲＨＩ（Ｘ
）は、電源用の共通導体ライン２１０とＸ番目の駆動Ｉ
Ｃとの接続点２１０Ｘから左側の部分の１源用の共通導
体ライン２１０の抵抗とリード線２１１の抵抗との和で
与えられるライン抵抗でありｈ　ＲＨ２（Ｘ）は、接続
点２１０Ｘから右側の部分の電源用の共通導体ライン２
１０の抵抗とリード線２１２の抵抗との和で与えられる
ライン抵抗である。したがって、外部電源ライン２５０
とリード線２１１との接続点２５１と接続点２１０ｘ間
の抵抗はＲＨＩ（Ｘ）とＲｍ（ｘ）との並列接続による
抵抗ＲＨ（Ｘ）で与えられる。一方、Ｒｏ（Ｘ）は、外
部グランドライン２６０とグランド用の共通導体ライン
２４０との接続端子２４１から、Ｘ番目の駆動ＩＣとグ
ランド用の共通導体ライン２４０との接続点２４０ｘま
でのグランド用の共通導体ラインの等価抵抗である。ま
た、Ｘ番目の発熱抵抗体自身の抵抗をＲ（ｘ）、それを
駆動するＩＣのオン抵抗をｒ（ｘ）と表わし、設計上は
Ｒ（ｘ）とｒ（ｘ）の和は発熱体の場所に依らずはｙ一
定値Ｒ（ｘ）になる様に考慮されており、抵抗検査で規
格内のもののみが選ばれる。しかしｓ　Ｒ’Ｈ（ｘ）と
ＲＧ（ｘ）については、場所（ｘ）によって異なり、第
５図（ａ）に示す様な分布を示す、すなわち凡Ｈ（Ｘ）
については、ＲＨＩ（Ｘ）がＸに関して単調増加し、一
方ＲＨ２（Ｘ）はＸに関して単調減少する為に、これら
の並列抵抗であるＲＨ（Ｘ）は凸形のはソ２次曲線的な
分布になる。−一方ｈ　Ｒｅ（ｘ）にっ゛いては、Ｘに
関して単調増加する分布であり、Ｒ（ｘ）が一定におさ
えられていても、総合抵抗値ＢＴ（Ｘ）　（ｗｍＦＬＨ
（ｘ）　＋Ｒ（ｘ）　＋Ｒ□（ｘ）　　）は図の様にＸ
について単調増加しｓ　ＲＴ（Ｘ）の大きな値を示すヘ
ッドの右側部分で印字ムラを生じやすく問題になってい
友。For example, as shown in FIG. 3, a conventional thermal head has a heating resistor 220 and a driving IC on a ceramic substrate 200.
A plurality of 230 series circuits are connected in parallel between a common conductor line 210 for power supply and a common conductor line 2400 for ground. The common conductor line 210 for power supply and the external power supply line 250 are connected to terminals 213 and 214 via lead wires 211 and 212, respectively, while the common conductor line 240 for ground is connected to the external ground line 260. It is connected through a terminal 241. In a thermal spatula with such a structure, the external power line 205
4(a) and 4(b) show the equivalent resistance between the external ground line 260 and the external ground line 260 when the Xth driving IC counting from the left side of the head is driven. RHI(X
) is the common conductor line 210 for the power supply and the Xth drive I
hRH2(X) is the line resistance given by the sum of the resistance of the common conductor line 210 for one source on the left side from the connection point 210X with C and the resistance of the lead wire 211. Common conductor line 2 for power supply of parts
10 and the resistance of the lead wire 212. Therefore, the external power line 250
The resistance between the connection point 251 and the connection point 210x between the lead wire 211 and the lead wire 211 is given by the resistance RH(X) due to the parallel connection of RHI(X) and Rm(x). On the other hand, Ro(X) is the ground connection from the connection terminal 241 between the external ground line 260 and the ground common conductor line 240 to the connection point 240x between the Xth drive IC and the ground common conductor line 240. is the equivalent resistance of a common conductor line. Also, the resistance of the X-th heating resistor itself is expressed as R(x), and the on-resistance of the IC that drives it is expressed as r(x), and in terms of design, the sum of R(x) and r(x) is the heating element It is considered that y is a constant value R(x) regardless of the location, and only those within the standard are selected in the resistance test. However, s R'H(x) and RG(x) differ depending on the location (x), and show a distribution as shown in Figure 5(a), that is, approximately H(X)
As for RHI(X), which increases monotonically with respect to X, and RH2(X) which monotonically decreases with respect to become. - On the other hand, h Re(x) has a monotonically increasing distribution with respect to X, and even if R(x) is held constant, the total resistance value BT(X) (wmFLH
(x) +R(x) +R□(x) ) is X as shown in the figure.
Printing unevenness tends to occur on the right side of the head where sRT(X) increases monotonically and shows a large value, which is a problem.

〔発明が解決しようとする問題点〕[Problem that the invention seeks to solve]

上述した従来の構造のサーマルヘッドでは、要するに外
部電源ラインおよび外部グランドラインへの外部リード
接続端子の取り方を、電源ラインおよびグランドライン
の等価抵抗が大きく分布することを考慮しないで決めて
いた為に、発熱体と駆動ＩＣを含めた総合抵抗値が場所
毎に変化し。In the thermal head with the conventional structure described above, the way to connect the external lead connection terminals to the external power line and external ground line was determined without considering the large distribution of equivalent resistance of the power line and ground line. In addition, the total resistance value including the heating element and drive IC changes from place to place.

変化の大きい部分の電流値が下がるために印字ムラを生
じやすく、歩留りが上らずコスト高になってしまう欠点
がある。Since the current value decreases in areas where there is a large change, uneven printing tends to occur, which has the drawback of not increasing yield and increasing costs.

本発明の目的は、上記従来構造のサーマルヘッドの持つ
印字ムラによる歩留シ低下およびコスト高の問題を除去
したサーマルヘッドを提供することにある。An object of the present invention is to provide a thermal head that eliminates the problems of low yield and high cost due to uneven printing, which the conventional thermal head has.

〔問題点を解決するための手段〕[Means for solving problems]

本発明の感熱記録ヘッドは、平行に配置した電源用の第
一の共通導体ラインとグランド用の第二の共通導体ライ
ンとの間に発熱抵抗体と駆動ＩＣの直列回路を複数個並
列に接続した感熱記録ヘッドにおいて、前記第一の共通
導体ラインへの外部リードの接続端子を前記第一の共通
導体ラインの両端部に設けると共に、前記第二の共通導
体ラインへの外部リードの接続端子を前記第二の共通導
体ラインの中央部に設けたことを特徴とするものである
。In the thermal recording head of the present invention, a plurality of series circuits of heating resistors and drive ICs are connected in parallel between a first common conductor line for power supply and a second common conductor line for ground, which are arranged in parallel. In the thermal recording head, connection terminals for external leads to the first common conductor line are provided at both ends of the first common conductor line, and connection terminals for the external lead to the second common conductor line are provided at both ends of the first common conductor line. It is characterized in that it is provided in the center of the second common conductor line.

〔実施例〕〔Example〕

次に、本発明について図面を参照して説明する。 Next, the present invention will be explained with reference to the drawings.

第１図は本発明の一実施例の構成図、第２図（ａ）、（
ｂ）、（ｃ）は第１図の感熱記録ヘッドの特性図である
。セラミック基板１００上に電源用の共通導体ライン１
１０とグランド用の共通導体ライン１４０が平行に配置
され、その間に、発熱抵抗体１２０と駆動ＩＣ１３０の
直列回路が複敬個並列に接続されている。外部電源ライ
ン１５０と電源用の共通導体ライン１１０との接続は、
電源用の共通導体ライン１１０の両側に設けた接続端子
１１３．１１４に端子１５１から各々リード線１１１．
１１２で接続している。一方、外部グランドライン１６
０とグランド用の共通導体ライン１４０との接続は、グ
ランド用の共通導体ライン１４０の中央部に設けた接続
端子１４１においてなされている。Figure 1 is a configuration diagram of an embodiment of the present invention, Figures 2 (a), (
b) and (c) are characteristic diagrams of the thermal recording head of FIG. 1. Common conductor line 1 for power supply on ceramic substrate 100
10 and a common conductor line 140 for grounding are arranged in parallel, and a series circuit of a heating resistor 120 and a driving IC 130 is connected in parallel between them. The connection between the external power supply line 150 and the common conductor line 110 for power supply is as follows.
Lead wires 111.151 are connected to connecting terminals 113.114 provided on both sides of the common conductor line 110 for power supply.
Connected with 112. On the other hand, external ground line 16
0 and the common conductor line 140 for grounding is made at a connection terminal 141 provided at the center of the common conductor line 140 for grounding.

この様な構造のサーマルヘッドでは、左から数えてＸ番
目の発熱抵抗体を駆動する場合について端子１５１と１
４１間のヘッドの等価抵抗を調べてみると、リード線１
１１，１１２を含めた電源用の共通導体ライン１１０側
の等価抵抗Ｒｕ（ｘ）は従来例で説明したと同様に左側
のライン抵抗ＲＨ１（ｘ）と右側のライン抵抗ＲＨ２（
Ｘ）の並列回路で与えられ、第２１１１（ａ）に示すよ
うに、ＲＭＩ（Ｘ）とＲｍ（Ｘ）は各々Ｘに対して単調
増加および単調減少函数となっているから、等価抵抗Ｒ
Ｈ（ｘ）は凸形の２次曲線状に変化する。一方、グラン
ド用の共通導体ラインの等価抵抗Ｒ□（ｘ）は、接続端
子１４１が中央部にあるために第２図（ｂ）に示すよう
にＸに関して凹形の直線的分布を示し、しかも、従来例
と違ってその値もほぼ１７２以下になる。In a thermal head with such a structure, when driving the X-th heating resistor counting from the left, terminals 151 and 1 are connected.
When we looked at the equivalent resistance of the head between lead wires 1 and 41, we found that lead wire 1
The equivalent resistance Ru(x) on the side of the common conductor line 110 for the power supply including 11 and 112 is the line resistance RH1(x) on the left side and the line resistance RH2(x) on the right side as explained in the conventional example.
As shown in No. 2111(a), since RMI(X) and Rm(X) are monotonically increasing and monotonically decreasing functions with respect to X, the equivalent resistance R
H(x) changes in the shape of a convex quadratic curve. On the other hand, the equivalent resistance R□(x) of the common conductor line for ground shows a concave linear distribution with respect to X as shown in FIG. 2(b) because the connection terminal 141 is located in the center. , unlike the conventional example, the value is also approximately 172 or less.

したがって、ＲＨ（ｘ）とＲｏ　（ｘ　）および発熱体
抵抗Ｒ（ｘ）と駆動ＩＣのオン抵抗ｒ（ｘ）の総和であ
る総合抵抗値ＲＴ（Ｘ）は、同図（ｃ）に示すようにＲ
Ｈ（ｘ）の凸函数とＲ□（ｘ）の凹函数が丁度キャンセ
ルし合ってほとんど一定値に近い分布を示す、これによ
って、この様々ヘッドを使った感熱記録装置では、印字
ムラを著しく減少できる。Therefore, the total resistance value RT(X), which is the sum of RH(x) and Ro(x), the heating element resistance R(x), and the on-resistance r(x) of the drive IC, is as shown in Figure (c). niR
The convex function of H (x) and the concave function of R can.

〔発明の効果〕〔Effect of the invention〕

以上説明したように本発明は、従来のヘッドで無視され
ていた電源用とグランド用の共通導体ラインの等価抵抗
の分布を、これらの導体ラインへの接続端子の位雪を変
更することにより、等価抵抗和を一定にでき、かつ発熱
体と駆動ＩＣを含めた総等価抵抗値を実質的に一定にお
さえることが可能になり、印字ムラが著しく減少できる
効果がある。また、この様に印字ムラの減少によりヘッ
ドの生産の歩留りが向上し、；スト高の問題も除去でき
る効果がある。As explained above, the present invention improves the distribution of the equivalent resistance of the common conductor lines for power supply and ground, which has been ignored in conventional heads, by changing the position of the connection terminals to these conductor lines. It is possible to keep the sum of equivalent resistances constant, and to keep the total equivalent resistance value including the heating element and drive IC substantially constant, which has the effect of significantly reducing printing unevenness. Further, by reducing printing unevenness in this way, the yield of head production is improved, and the problem of strike height can also be eliminated.

【図面の簡単な説明】[Brief explanation of drawings]

第１図は本発明の一実施例の構成図、第２図（ａ）　、
　（ｂ）　、　（ｃ）は第１図の感熱記録ヘッドの特性
図、第３図は従来例の構成図、第４図（ａ）、（ｂ）は
第３図の感熱記録ヘッドにおける１つの駆動ＩＣがオン
したときの等価回路図、第５図（ａ）、（ｂ）。 （Ｃ）は第３図の感熱記録ヘッドの特性図である。 １００．２００・・・・・・セラミック基板、１１０，
２１０・・・・・・電源用の共通導体ライン、１２０．
２２０・・・・・・発熱抵抗体、１３０　、２３０　・
・・・・４’に＊　Ｉ　Ｃ，１１１。 １１２．２１１．２１２・・・・・・リード線、１４０
．２４０・・・　　　　１・・・グランド用の共通導体
ライン、１５０．２５０・・・・・・外部電源ライン、
１６０．２６０・・・・・・外部グランドライン、１１
３，１１４，２１３，２１４，１４１．２４１・・・・
・・接続端子、１５１・・・・・・端子。 代理人　弁理士　　内　原　　　晋ｔ”ｆ”　’−パて 一− ）１＠Fig. 1 is a configuration diagram of an embodiment of the present invention, Fig. 2(a),
(b) and (c) are characteristic diagrams of the thermal recording head in Figure 1, Figure 3 is a configuration diagram of the conventional example, and Figures 4 (a) and (b) are characteristic diagrams of the thermal recording head in Figure 3. Equivalent circuit diagrams when the drive IC is turned on, FIGS. 5(a) and 5(b). (C) is a characteristic diagram of the thermal recording head shown in FIG. 3. 100.200...ceramic substrate, 110,
210... Common conductor line for power supply, 120.
220... Heat generating resistor, 130, 230 ・
...4'* I C, 111. 112.211.212・・・Lead wire, 140
．． 240... 1... Common conductor line for ground, 150.250... External power supply line,
160.260...External ground line, 11
3,114,213,214,141.241...
...Connection terminal, 151...Terminal. Agent Patent Attorney Susumu Uchihara t"f"'-Pateichi-)1@

Claims (1)

【特許請求の範囲】[Claims] 平行に配置した電源用の第一の共通導体ラインとグラン
ド用の第二の共通導体ラインとの間に発熱抵抗体と駆動
ＩＣの直列回路を複数個並列に接続した感熱記録ヘッド
において、前記第一の共通導体ラインへの外部リードの
接続端子を前記第一の共通導体ラインの両端部に設ける
と共に、前記第二の共通導体ラインへの外部リードの接
続端子を前記第二の共通導体ラインの中央部に設けたこ
とを特徴とする感熱記録ヘッド。In a thermal recording head in which a plurality of series circuits of heating resistors and drive ICs are connected in parallel between a first common conductor line for power supply and a second common conductor line for ground, which are arranged in parallel, Connection terminals for external leads to one common conductor line are provided at both ends of the first common conductor line, and connection terminals for external leads to the second common conductor line are provided at both ends of the first common conductor line. A thermal recording head characterized by being installed in the center.
JP17071885A 1985-08-02 1985-08-02 Thermal recording head Pending JPS6232058A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP17071885A JPS6232058A (en) 1985-08-02 1985-08-02 Thermal recording head

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP17071885A JPS6232058A (en) 1985-08-02 1985-08-02 Thermal recording head

Publications (1)

Publication Number Publication Date
JPS6232058A true JPS6232058A (en) 1987-02-12

Family

ID=15910107

Family Applications (1)

Application Number Title Priority Date Filing Date
JP17071885A Pending JPS6232058A (en) 1985-08-02 1985-08-02 Thermal recording head

Country Status (1)

Country Link
JP (1) JPS6232058A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02286261A (en) * 1989-04-27 1990-11-26 Rohm Co Ltd Thermal head
WO1997004965A1 (en) * 1995-07-31 1997-02-13 Rohm Co., Ltd. Linear thermal print head and linear thermal print head apparatus

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02286261A (en) * 1989-04-27 1990-11-26 Rohm Co Ltd Thermal head
JPH0417797B2 (en) * 1989-04-27 1992-03-26 Rohm Kk
WO1997004965A1 (en) * 1995-07-31 1997-02-13 Rohm Co., Ltd. Linear thermal print head and linear thermal print head apparatus

Similar Documents

Publication Publication Date Title
JPH0524231A (en) Thermal head and electronic apparatus equipped therewith
JPH05243305A (en) Electronic circuit device
JPS6232058A (en) Thermal recording head
EP0129876B1 (en) A thermal print head
JP3289820B2 (en) Thermal head
JPS6233655A (en) Heat-snesitive recording head
JP3167262B2 (en) Line type thermal print head
US4990935A (en) Thermal head
JP3405724B2 (en) Thermal head
JPH0661949B2 (en) Thermal print head
JP2519399Y2 (en) Thermal head array structure
JP2818509B2 (en) Thermal head
JPS61141572A (en) Thermal head
JP3405725B2 (en) Thermal head
JPH02286261A (en) Thermal head
JP2001162849A (en) Thermal head
JP2594407B2 (en) Thermal head
JP2530247B2 (en) Thermal head array diode array
JPS61160255A (en) Circuit base for thermal head
JPS5845974A (en) Thermal head
JPH0323734Y2 (en)
JPS6111260A (en) Thermal head
JPS6399964A (en) Thermal head
JPH0248429B2 (en) SAAMARUHETSUDO
JPH0781116A (en) Thermal printing head