JPS63185651A - thermal head - Google Patents
thermal headInfo
- Publication number
- JPS63185651A JPS63185651A JP62017877A JP1787787A JPS63185651A JP S63185651 A JPS63185651 A JP S63185651A JP 62017877 A JP62017877 A JP 62017877A JP 1787787 A JP1787787 A JP 1787787A JP S63185651 A JPS63185651 A JP S63185651A
- Authority
- JP
- Japan
- Prior art keywords
- resistor element
- heating resistor
- thermal head
- voltage
- drive
- 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
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
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
【発明の詳細な説明】
（技術分野）
本発明はファクシミリやプリンタなどの機器に使用され
るサーマルヘッドに関するものである。DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention relates to a thermal head used in equipment such as facsimiles and printers.
（従来技術）
サーマルヘッドには通電発熱して感熱記録紙を発色させ
たり熱転写紙によって熱転写を起させる発熱抵抗体素子
が形成されており、これらの発熱抵抗体素子の通電を制
御する駆動回路として駆動用ＩＣが搭載された形式のも
のがある。そのような形式のサーマルヘッドがファクシ
ミリやプリンタなどの機器に取りつけられた場合１機器
側からサーマルヘッドに供給する電源としては、発熱抵
抗体素子を通電させるための電源と、駆動用ＩＣを動作
させるための電源との２種類の電源が必要である。(Prior art) A thermal head is formed with a heating resistor element that generates heat when energized to cause color development on thermal recording paper or thermal transfer by thermal transfer paper, and a drive circuit that controls energization of these heating resistor elements. There are models equipped with a driving IC. When such a type of thermal head is attached to a device such as a facsimile or printer, the power supplied from the device to the thermal head includes the power to energize the heating resistor element and the power to operate the drive IC. Two types of power sources are required:
従来は１発熱抵抗体素子を通電させるために、９〜２５
Ｖの電圧を使用し、駆動用ＩＣを動作させるために５ｖ
の電圧を使用している。Conventionally, in order to energize one heating resistor element, 9 to 25
V voltage is used, and 5V is used to operate the drive IC.
voltage is used.
サーマルヘッドでは１発熱抵抗体素子に流れる電流が大
きく、また、駆動用ＩＣで流れる電流も大きい、したが
って、電流容量の大きい２種類の電源をファクシミリや
プリンタなどの機器に備えることは、機器のスペースが
大きく必要になる点や、電源コストが高くなる点で不利
である。In a thermal head, the current flowing through one heating resistor element is large, and the current flowing through the drive IC is also large. Therefore, equipping equipment such as facsimiles and printers with two types of power supplies with large current capacity is a great way to save space on equipment. This is disadvantageous in that it requires a large amount of power and increases the power supply cost.
（目的）
本発明は、サーマルヘッドの電源に要するスペースやコ
ストを低下させることを目的とするものである。(Objective) The present invention aims to reduce the space and cost required for a power source for a thermal head.
（構成）
本発明のサーマルヘッドでは１発熱抵抗体素子の通電用
印加電圧と駆動回路を動作させる印加電圧とを同一電圧
とした。(Structure) In the thermal head of the present invention, the applied voltage for energizing one heating resistor element and the applied voltage for operating the drive circuit are the same voltage.
以下、実施例について具体的に説明する。Examples will be specifically described below.
図はサーマルヘッドの一例の電気回路を示すものである
。The figure shows an electric circuit of an example of a thermal head.
２は発熱抵抗体素子であり、複数個が列状に配置され、
それぞれの発熱抵抗体素子２の一端は共通電極４に接続
され、他端は個別電極６に接続されている。共通電極４
は発熱抵抗体素子２を通電発熱させるための電源端子Ｖ
ｈｄに接続され、個別電極６は駆動用ＩＣ８−１，８−
２，・・・・・・に接続されている。駆動用ＩＣ８−１
，８−２，・・・・・・は所定数、例えば１２８個や２
５６個といった数、の発熱抵抗体素子２の通電を制御す
る。2 is a heating resistor element, a plurality of which are arranged in a row,
One end of each heating resistor element 2 is connected to a common electrode 4, and the other end is connected to an individual electrode 6. Common electrode 4
is a power supply terminal V for energizing the heating resistor element 2 to generate heat.
hd, and the individual electrodes 6 are connected to drive ICs 8-1, 8-
2,... is connected to. Drive IC8-1
, 8-2, ... is a predetermined number, for example, 128 or 2
The energization of the 56 heating resistor elements 2 is controlled.
駆動用ＩＣ８−１，８−２，・・・・・・には、データ
入力端子ＤＩから印字データ信号を入力し、そのデータ
信号をクロック信号端子ＧＫからのクロック信号によっ
て歩進させるシフトレジスタ１０と、ロード信号端子Ｌ
Ｄからのロード信号によってシフトレジスタ１０のデー
タを入力し保持するラッチ１２と、ラッチ１２に保持さ
れたデータを一方の入力端子に入力し、他方の入力端子
には印字信号（ストローブ信号）を入力する所定数のア
ンドゲート回路１４と、各アンドゲート回路１４の出力
信号によって発熱抵抗体素子２を通電させる所定数のス
イッチングトランジスタ１６とが備えられている。スイ
ッチングトランジスタ１６は各発熱抵抗体素子２に１個
ずつ設けられ、各スイッチングトランジスタ１６のエミ
ッタはグランド端子ＧＮＤに接続されている。Ｖｄｄは
駆動用ＩＣ８−１，８−２，・・・・・・を動作させる
ための電源端子であり、Ｖｓｓは駆動用ＩＣ８−１，８
−２，・−・−・のグランド端子である。ＤＯはデータ
出力端子である。２０はサーマルヘッドの温度を測定す
るためのサーミスタ、２２．２４はクロック信号ＣＫの
波形を整形するためのインバータ、２６．２８はノイズ
除去のためのコンデンサーである。The drive ICs 8-1, 8-2, . . . are provided with a shift register 10 which inputs a print data signal from a data input terminal DI and advances the data signal by a clock signal from a clock signal terminal GK. and load signal terminal L
A latch 12 inputs and holds data in the shift register 10 by a load signal from D, the data held in the latch 12 is input to one input terminal, and a print signal (strobe signal) is input to the other input terminal. A predetermined number of AND gate circuits 14 and a predetermined number of switching transistors 16 that energize the heating resistor element 2 according to the output signal of each AND gate circuit 14 are provided. One switching transistor 16 is provided for each heating resistor element 2, and the emitter of each switching transistor 16 is connected to the ground terminal GND. Vdd is a power supply terminal for operating the driving ICs 8-1, 8-2, ..., and Vss is the power supply terminal for operating the driving ICs 8-1, 8-2, .
-2, . . . ground terminal. DO is a data output terminal. 20 is a thermistor for measuring the temperature of the thermal head, 22.24 is an inverter for shaping the waveform of the clock signal CK, and 26.28 is a capacitor for removing noise.
図の例では発熱抵抗体素子２は駆動用ＩＣ８−１，８−
２，・・・・・・で制御される単位にグループ化されて
おり、各グループに対して印字信号ＳＢＩ〜ＳＢ８がそ
れぞれ割当てられており、印字信号ＳＢＩ〜ＳＢ８は印
字信号入力端子ＳＢＩ〜ＳＢ８から各インバータ１８を
経て各駆動用ＩＣ８−１，８−２，・・・・・・のアン
ドゲート回路１４に入力される。In the example shown in the figure, the heating resistor element 2 is the driving IC 8-1, 8-
2, . The signal is then inputted to the AND gate circuit 14 of each driving IC 8-1, 8-2, . . . via each inverter 18.
本発明では発熱抵抗体素子２を通電させるために印加さ
れる電圧ｖｈｄと駆動用ＩＣ８−１，８−２゜・・・・
・・を動作させるために印加する電圧Ｖｄｄとを同一電
圧とする。In the present invention, the voltage vhd applied to energize the heating resistor element 2 and the driving IC 8-1, 8-2...
The voltage Vdd applied to operate the ... is the same voltage.
一例としてＶｈｄ＝Ｖｄｄ＝５Ｖとする。As an example, let Vhd=Vdd=5V.
最近、感熱記録紙や熱転写紙の感度は向上の一途を辿っ
ており、現在でも８ドツト／ ｍ ｍの記録密度のサー
マルヘッドで０．２ミリジユール（ｍＪｏｕｌ）の印加
エネルギーでも発色が可能となっている。Recently, the sensitivity of thermal recording paper and thermal transfer paper has continued to improve, and even now it is possible to produce color with an applied energy of 0.2 millijoules (mJoul) using a thermal head with a recording density of 8 dots/mm. There is.
印加電圧Ｖｈｄを５ｖとし、印加エネルギーを０゜２ミ
リジユールとした場合の発熱抵抗体素子２の抵抗値を算
出する１発熱抵抗体素子２の抵抗値Ｒは次の式で算出す
ることができる。Calculating the resistance value of the heating resistor element 2 when the applied voltage Vhd is 5V and the applied energy is 0°2 millijoules.1 The resistance value R of the heating resistor element 2 can be calculated by the following formula.
Ｒ＝Ｖ”・ｔ／Ｅ
＝５２・１０．２
＝１ ２５ ｔ
ここで、Ｅは印加エネルギー（ミリジュール）、ｔは印
加パルス幅（ミリ秒）、■は印加電圧（Ｖ）である。こ
の結果によれば、発熱抵抗体素子２の抵抗値を１２５Ω
にすれば、１ミリ秒のパルス幅で発色エネルギー０．２
ミリジユールを得ることができ、印加電圧５ｖでも充分
に実用に耐えることができる。R=V”・t/E=52・10.2=1 25 t Here, E is the applied energy (millijoules), t is the applied pulse width (milliseconds), and ■ is the applied voltage (V). According to this result, the resistance value of the heating resistor element 2 is 125Ω.
, the coloring energy is 0.2 with a pulse width of 1 ms.
Millijoules can be obtained, and even an applied voltage of 5 V can sufficiently withstand practical use.
Ｖｈｄ＝Ｖｄｄ＝５Ｖとした場合には、通常の機器に常
用されている５ｖ電源単一ですむことになる。When Vhd=Vdd=5V, a single 5V power supply, which is commonly used in ordinary equipment, is sufficient.
上記の実施例では、ＶｈｄとＶｄｄを共に５ｖととして
いるが、両者を共に１２Ｖなど、他の電圧値に設定して
もよく、要するに発熱抵抗体素子２の印加電圧と駆動用
ＩＣ８−１，８−２，・・・・・・の印加電圧を等しく
すればよい。In the above embodiment, both Vhd and Vdd are set to 5V, but both may be set to other voltage values such as 12V. In short, the voltage applied to the heating resistor element 2 and the driving IC 8-1, 8-2, . . . may be applied to the same voltage.
（効果）
本発明のサーマルヘッドでは１発熱抵抗体素子の通電用
印加電圧と駆動回路を動作させる印加電圧とを同一電圧
としたので、使用電源が１種類ですむようになり、サー
マルヘッドを搭載する機器側での電源用のスペースを小
さくし、電源コストを低減させることができる。例えば
発熱抵抗体素子の印加電圧と駆動回路の印加電圧をとも
に５ｖとした場合には、機器側で新たに発熱抵抗体素子
用の電源を設けることが不要になる。サーマルヘッドで
は、発熱抵抗体素子用の電源も駆動回路用の電源もとも
に電流容量の大きいものが必要であるので、この電源が
単一電源ですむ本発明は特に有効である。(Effects) In the thermal head of the present invention, the applied voltage for energizing one heating resistor element and the applied voltage for operating the drive circuit are the same voltage, so only one type of power source is required, and equipment equipped with the thermal head It is possible to reduce the space for the power supply on the side and reduce the cost of the power supply. For example, if the voltage applied to the heat generating resistor element and the voltage applied to the drive circuit are both 5V, it becomes unnecessary to provide a new power source for the heat generating resistor element on the equipment side. In a thermal head, both the power source for the heating resistor element and the power source for the drive circuit need to have large current capacities, so the present invention, which requires only a single power source, is particularly effective.
図は一実施例を示す回路図である。 ２・・・・・・発熱抵抗体素子、 ８・・・・・・駆動用ＩＣ１ Ｖｈｄ・・・・・・発熱抵抗体素子通電用印加電圧。 Ｖｄｄ・・・・・・駆動用ＩＣ動作用の印加電圧。 The figure is a circuit diagram showing one embodiment. 2...Heating resistor element, 8...Drive IC1 Vhd... Applied voltage for energizing the heating resistor element. Vdd... Applied voltage for driving IC operation.
Claims (1)
し、かつ、前記発熱抵抗体素子の通電用印加電圧と前記
駆動回路を動作させる印加電圧とを同一電圧としたサー
マルヘッド。(1) A thermal head that is equipped with a drive circuit that controls energization of a heat-generating resistor element, and in which the applied voltage for energizing the heat-generating resistor element and the applied voltage for operating the drive circuit are the same voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1787787A JP2521453B2 (en) | 1987-01-27 | 1987-01-27 | Thermal head |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1787787A JP2521453B2 (en) | 1987-01-27 | 1987-01-27 | Thermal head |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63185651A true JPS63185651A (en) | 1988-08-01 |
| JP2521453B2 JP2521453B2 (en) | 1996-08-07 |
Family
ID=11955918
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1787787A Expired - Lifetime JP2521453B2 (en) | 1987-01-27 | 1987-01-27 | Thermal head |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2521453B2 (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5896576A (en) * | 1981-12-04 | 1983-06-08 | Fuji Xerox Co Ltd | Driving system of thermal head |
| JPS59212282A (en) * | 1983-05-17 | 1984-12-01 | Mitsubishi Electric Corp | Driving circuit for thermal head |
| JPS60260357A (en) * | 1984-06-07 | 1985-12-23 | Canon Inc | Thermal recording apparatus |
| JPS61283564A (en) * | 1985-06-07 | 1986-12-13 | Matsushita Electric Ind Co Ltd | Thermal recording head and thermal recording device |
-
1987
- 1987-01-27 JP JP1787787A patent/JP2521453B2/en not_active Expired - Lifetime
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5896576A (en) * | 1981-12-04 | 1983-06-08 | Fuji Xerox Co Ltd | Driving system of thermal head |
| JPS59212282A (en) * | 1983-05-17 | 1984-12-01 | Mitsubishi Electric Corp | Driving circuit for thermal head |
| JPS60260357A (en) * | 1984-06-07 | 1985-12-23 | Canon Inc | Thermal recording apparatus |
| JPS61283564A (en) * | 1985-06-07 | 1986-12-13 | Matsushita Electric Ind Co Ltd | Thermal recording head and thermal recording device |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2521453B2 (en) | 1996-08-07 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |