JPS6153064A - Thermal head controller - Google Patents
Thermal head controllerInfo
- Publication number
- JPS6153064A JPS6153064A JP17575884A JP17575884A JPS6153064A JP S6153064 A JPS6153064 A JP S6153064A JP 17575884 A JP17575884 A JP 17575884A JP 17575884 A JP17575884 A JP 17575884A JP S6153064 A JPS6153064 A JP S6153064A
- Authority
- JP
- Japan
- Prior art keywords
- voltage
- thermal head
- heating resistor
- pulse width
- resistance
- 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
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
- B41J2/36—Print density control
Landscapes
- Electronic Switches (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は各サーマルヘッドに一定レベルの発熱量を生じ
させるために、前記各サーマルヘッドが有する抵抗値と
、印加される電圧レベルに基づいて電圧印加時間を制御
するようにしたサーマルヘッド制御装置に関する。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention is based on the resistance value of each thermal head and the applied voltage level in order to generate a certain level of heat generation in each thermal head. The present invention relates to a thermal head control device that controls voltage application time.
第２図はサーマルヘッド１の制御装置を示し、復号され
た印字信号を入力するシフトレジスタ２（ラッチ回路は
図示上省略する。以下同じ）と、印字タイミング信号を
入力したときシフトレジスタ２の内容に応じて「１」を
出力するＡＮＤゲート３と、ＡＮＤゲート３からｒｌＪ
が出力されたとき作動するトランジスタ４と、トランジ
スタ４が作動したとき電源Ｖｌの電圧を電圧制御信号に
基づいて所定の電圧レベルに調整してサーマルヘッド１
に印加する電圧調整回路５を有する。FIG. 2 shows a control device for the thermal head 1, including a shift register 2 (the latch circuit is omitted for illustration purposes; the same applies hereinafter) to which a decoded print signal is input, and the contents of the shift register 2 when a print timing signal is input. AND gate 3 outputs “1” in response to rlJ
The thermal head 1 operates by adjusting the voltage of the power supply Vl to a predetermined voltage level based on the voltage control signal when the transistor 4 is activated.
It has a voltage adjustment circuit 5 that applies voltage to the voltage.
第３図は従来の厚膜型サーマルヘッドの具体的な構成例
を示し、該サーマルヘッド１は、アルミナ基板１０と、
アルミナ基板１０上に形成されたガラス等よりなるグレ
ーズド層１１と、グレーズド層１１上に配設された金等
からなる電極１２と、電極１２の中央部の対向し合った
端部に電気的に接続される発熱抵抗体１３（第２図のサ
ーマルヘッド１の抵抗に相当する）と、発熱抵抗体１３
から電極にかけて被覆された耐摩耗層１４とを有する。FIG. 3 shows a specific configuration example of a conventional thick film type thermal head, and the thermal head 1 includes an alumina substrate 10,
A glazed layer 11 made of glass or the like formed on an alumina substrate 10, an electrode 12 made of gold or the like disposed on the glazed layer 11, and electrically connected to opposing ends of the central part of the electrode 12. The connected heating resistor 13 (corresponding to the resistance of the thermal head 1 in FIG. 2) and the heating resistor 13
It has a wear-resistant layer 14 which is coated from the electrode to the electrode.
グレーズド層１１としては電極１４の配設を容易にする
ために表面性の良好な素材が使用され、グレーズド層１
１の幅（第３図Ａ−Ａ’ 間距離）はアルミナ基板１０
表面の全長と同等か、或いは少なくとも２（Ｉｎ以−り
必要とされ、厚さは４０μｍ以上必要とされていた。A material with good surface properties is used for the glazed layer 11 in order to facilitate the arrangement of the electrodes 14.
The width of 1 (distance between A-A' in Figure 3) is the alumina substrate 10
It was required to be equal to the total length of the surface or at least 2 (In) or more, and the thickness was required to be 40 μm or more.
以上の構成において、ＡＮＤ回路３にパルス状の印字タ
イミング信号を与えると、シフトレジスタ２の印字信号
に応じてトランジスタ４が作動するため、作動したトラ
ンジスタ４に接続されたサーマルヘッド１が発熱する。In the above configuration, when a pulsed print timing signal is applied to the AND circuit 3, the transistor 4 is activated in response to the print signal from the shift register 2, so that the thermal head 1 connected to the activated transistor 4 generates heat.
サーマルヘッド１が発熱すると感熱記録紙に印字が行わ
れる。When the thermal head 1 generates heat, printing is performed on thermal recording paper.
発熱抵抗体１３が発熱すると、グレーズド層１１が蓄熱
してアルミナ基板１０へ熱が逃げることを防止し、かつ
、所定の時限後に放熱する。グレーズド層１１は電極１
２の配設から前述した幅が必要であり、また、その厚さ
はサーマルヘッドの特性から定まる熱容量に応じて決め
られる。従って、印字スピードが比較的高速でない場合
即ち、一つの発熱と次の発熱との時間的間隔が比較的大
きい場合（例えば１０ｍ５ｅｃ以上の場合）は、グレー
ズド層１１の幅と厚さを前述した値にしたとしても所定
の品質で印字することができる。When the heating resistor 13 generates heat, the glazed layer 11 stores heat, prevents the heat from escaping to the alumina substrate 10, and radiates the heat after a predetermined time period. Glazed layer 11 is electrode 1
2, the above-mentioned width is required, and the thickness is determined according to the heat capacity determined from the characteristics of the thermal head. Therefore, when the printing speed is not relatively high, that is, when the time interval between one heat generation and the next heat generation is relatively long (for example, in the case of 10 m5ec or more), the width and thickness of the glazed layer 11 should be set to the above-mentioned values. It is possible to print with a predetermined quality even if the
しかし、従来のサーマルヘッド制御装置によれば、サー
マルヘッドの発熱抵抗体の固有抵抗が±１０％程度のバ
ラツキを有するため、各固有抵抗値に応じて印加電圧や
印加パルス幅を調整しなければならない不都合があった
。However, according to conventional thermal head control devices, the specific resistance of the heating resistor of the thermal head varies by about ±10%, so the applied voltage and applied pulse width must be adjusted according to each specific resistance value. There was an unavoidable inconvenience.
〔問題点を解決するための手段および作用〕本発明は上
記に鑑みてなされたものであり、印加電圧や印加パルス
幅の調整をやらないで各サーマルヘッド毎の発熱量を一
定レベルに制御し印字濃度のむらをなくすため、
各ヘッド毎の抵抗値を記憶し、該記憶値と印加電圧とか
ら演算されたパルス幅を各ヘッド毎に印加する装置を備
えたサーマルヘッド制御装置を提供するものである。[Means and effects for solving the problems] The present invention has been made in view of the above problems, and it is possible to control the amount of heat generated by each thermal head to a constant level without adjusting the applied voltage or the applied pulse width. In order to eliminate unevenness in print density, a thermal head control device is provided that is equipped with a device that stores a resistance value for each head and applies a pulse width calculated from the stored value and applied voltage to each head. be.
以下、本発明によるサーマルヘッド制御装置を詳細に説
明する。第１図は本発明の一実施例を示し、第２図と同
一のものには同一の引用数字を用いたので重複する説明
は省略するが、電圧調整回路５で定電圧に調整された電
圧のレベル信号をディジタル信号に変換して出力するＡ
／Ｄコンバータ２１と、サーマルヘッド１の各抵抗値（
例えばＲｒ。Hereinafter, a thermal head control device according to the present invention will be explained in detail. FIG. 1 shows an embodiment of the present invention, and since the same reference numerals are used for the same parts as in FIG. 2, a duplicate explanation will be omitted. A that converts the level signal of the signal into a digital signal and outputs it.
/D converter 21 and thermal head 1 resistance values (
For example, Rr.
Ｒ２，・・・Ｒ，）を記憶した不揮発性の記憶素子（Ｎ
ＶＭ）２２と、入力信号の演算処理に必要なプログラム
を格納するＲＯＭテーブル２６と、演算された各パルス
幅を記憶するＲＡＭ２３と、ＲＡＭ２３の演算記憶値に
基づいてサーマルヘッド１をオンさせる駆動回路２７と
から構成されている。（尚、図示上入出力インターフェ
ースは省略した）。A non-volatile memory element (N
VM) 22, a ROM table 26 that stores programs necessary for arithmetic processing of input signals, a RAM 23 that stores each calculated pulse width, and a drive circuit that turns on the thermal head 1 based on the calculated and stored values of the RAM 23. It consists of 27. (Note that the input/output interface is omitted in the illustration).
以上の構成において、印字操作が開始すると、サーマル
ヘッド１の各抵抗値（Ｒ１，Ｒｚ、・・・Ｒ，）が記憶
されている記憶素子２２よりＣＰＵ２５に読み込まれる
。更に定電圧に調整された電圧Ｖ、はＡ／Ｄコンバータ
２１によりディジタル値としてＣＰＵ２５に読み込まれ
る。この各抵抗値（Ｒｒ、Ｒｔ、・・・Ｒｎ）と電圧Ｖ
ｌとから、所定の発熱量をＷとすると（ｔｎはパルス幅
）
ｗ−”−・ｔ。In the above configuration, when a printing operation starts, each resistance value (R1, Rz, . . . R,) of the thermal head 1 is read into the CPU 25 from the memory element 22 in which it is stored. Further, the voltage V, which has been adjusted to a constant voltage, is read into the CPU 25 as a digital value by the A/D converter 21. These resistance values (Rr, Rt,...Rn) and the voltage V
From l, if the predetermined amount of heat generation is W (tn is the pulse width), then w-"-.t.
となり、すなわち
ｔ、−一１０・ｋ−
となり、Ｖ、とＲｌｌによりＲＯＭテーブル２６に記憶
された換算表（７）を参照して各サーマルヘッド１のノ
（ルス幅（ｉ Ｉｎ ｔ ｔ、・・・ｔｌｌ）が決定さ
れる。このｔｎに基づいて駆動回路２７が駆動信号を出
力すると、シフトレジスタ２の画像情報に応じて、ＡＮ
Ｄ回路３が「１」あるいは「０」を出力し、トランジス
タ４の作動を制御する。これによって画像情報に対応し
たサーマルヘッド１に所定の発熱を生じさせることが出
来る。That is, t, -10.k-, and by referring to the conversion table (7) stored in the ROM table 26 using V and Rll, the width of each thermal head 1 (i In t t,. ...tll) is determined. When the drive circuit 27 outputs a drive signal based on this tn, the AN
The D circuit 3 outputs "1" or "0" and controls the operation of the transistor 4. This allows the thermal head 1 to generate a predetermined amount of heat corresponding to the image information.
本実施例では、電源オン直後に電圧Ｖｍによる換算値を
算出したが、印字ライン毎に電圧変動する電圧を換算す
ることによりさらに正確な発熱を生ずる事が出来る。In this embodiment, the converted value based on the voltage Vm was calculated immediately after the power was turned on, but more accurate heat generation can be generated by converting the voltage that fluctuates for each printing line.
以上説明したｉｌり本発明のサーマルヘッド制御装置に
よれば、各ヘッド毎の抵抗値を記憶し、該記憶値と印加
電圧とから演算されたパルス幅を各ヘッド毎に印加する
装置を備えたため、印加電圧や印加パルス幅の調整をや
らないで各サーマルヘッド毎の発熱量を一定レベルに制
御し印字濃度のむらをなくすことができる。According to the thermal head control device of the present invention as described above, it is equipped with a device that stores the resistance value of each head and applies a pulse width calculated from the stored value and the applied voltage to each head. , it is possible to control the amount of heat generated by each thermal head to a constant level without adjusting the applied voltage or the applied pulse width, thereby eliminating uneven print density.
第１図は本発明のサーマルヘッド制御装置の構成図、第
２図は従来のサーマルヘッドの要部を示す回路図、第３
図は従来のサーマルヘッドの構成説明図。
符号の説明
１・・・サーマルヘッド ２・・・シフトレジスタ３・
・・ＡＮＤゲート ４・・・トランジスタ５・・・電
圧調整回路 １１・・・グレーズド層１２・・・電極
１３・・・発熱抵抗体１４・・・耐摩耗層
２１・・・Ａ／Ｄコンバータ２２・・・記憶素
子（ＮＶＭ）
２３・ ・ ・ＲＡＭ ２４・ ・ ・
ＲＯＭ２５・・・ＣＰ Ｕ ２６・・・ＲＯ
Ｍテーブル２７・・・駆動回路
特許出願人 富士ゼロックス株式会社
代理人 弁理士 松 原 伸 ２
同 同 村木清司
同 同 平田忠雄
同 同 上島淳−
同 同 鉛末 均Fig. 1 is a configuration diagram of a thermal head control device of the present invention, Fig. 2 is a circuit diagram showing main parts of a conventional thermal head, and Fig. 3 is a circuit diagram showing main parts of a conventional thermal head.
The figure is an explanatory diagram of the configuration of a conventional thermal head. Explanation of symbols 1... Thermal head 2... Shift register 3.
...AND gate 4...Transistor 5...Voltage adjustment circuit 11...Glazed layer 12...Electrode 13...Heating resistor 14...Wear-resistant layer 21...A/D converter 22 ...Memory element (NVM) 23. . . RAM 24. . .
ROM25...CPU 26...RO
M table 27... Drive circuit patent applicant Fuji Xerox Co., Ltd. Agent Patent attorney Shin Matsubara 2 Same as Seiji Muraki Same same as Tadao Hirata Same same Same as Same As Jun Uejima- Same same as Hitoshi Lead Powder
Claims (1)
よつて感熱記録紙に、あるいは感熱インクトナーシート
を介して記録紙に印字するサーマルヘツドにおいて、 前記電圧レベルを検出する電圧レベル検出手段と、前記
発熱抵抗体の抵抗値を記憶した記憶手段と、前記電圧レ
ベルと前記抵抗値に基づいて前記発熱抵抗体に電圧を印
加するオン時間を演算し、このオン時間にして基づいて
前記発熱抵抗体に電圧を印加させる制御手段を備えたこ
とを特徴とするサーマルヘツド制御装置。[Claims] In a thermal head that prints on thermal recording paper by heat generation of a heating resistor to which a voltage is applied in accordance with a print signal, or on recording paper via a thermal ink toner sheet, the voltage level is A voltage level detecting means to detect, a storage means storing the resistance value of the heating resistor, and calculating an on time for applying a voltage to the heating resistor based on the voltage level and the resistance value, and calculating the on time for applying the voltage to the heating resistor. 1. A thermal head control device comprising: control means for applying a voltage to the heating resistor based on the temperature of the heating resistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17575884A JPS6153064A (en) | 1984-08-23 | 1984-08-23 | Thermal head controller |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17575884A JPS6153064A (en) | 1984-08-23 | 1984-08-23 | Thermal head controller |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6153064A true JPS6153064A (en) | 1986-03-15 |
Family
ID=16001735
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP17575884A Pending JPS6153064A (en) | 1984-08-23 | 1984-08-23 | Thermal head controller |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6153064A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH028063A (en) * | 1988-06-27 | 1990-01-11 | Nec San-Ei Instr Co Ltd | Stabilization of printing quality of thermal recorder |
| US5191355A (en) * | 1989-06-29 | 1993-03-02 | Samsung Electronics Co., Ltd. | Device for adjusting the heat-generating time of a thermal printer head |
| GB2435952A (en) * | 2006-03-09 | 2007-09-12 | Markem Tech Ltd | A method of operating a print head and a print head with associated memory for storing the value of the electrical resistance of the print head |
-
1984
- 1984-08-23 JP JP17575884A patent/JPS6153064A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH028063A (en) * | 1988-06-27 | 1990-01-11 | Nec San-Ei Instr Co Ltd | Stabilization of printing quality of thermal recorder |
| US5191355A (en) * | 1989-06-29 | 1993-03-02 | Samsung Electronics Co., Ltd. | Device for adjusting the heat-generating time of a thermal printer head |
| GB2435952A (en) * | 2006-03-09 | 2007-09-12 | Markem Tech Ltd | A method of operating a print head and a print head with associated memory for storing the value of the electrical resistance of the print head |
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