JPS6349459A - Thermal head driving method - Google Patents
Thermal head driving methodInfo
- Publication number
- JPS6349459A JPS6349459A JP19317486A JP19317486A JPS6349459A JP S6349459 A JPS6349459 A JP S6349459A JP 19317486 A JP19317486 A JP 19317486A JP 19317486 A JP19317486 A JP 19317486A JP S6349459 A JPS6349459 A JP S6349459A
- Authority
- JP
- Japan
- Prior art keywords
- temperature
- thermal head
- resistance
- head
- driving
- 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
- 238000000034 method Methods 0.000 title claims description 18
- 238000010438 heat treatment Methods 0.000 abstract description 13
- 238000006243 chemical reaction Methods 0.000 abstract 4
- 238000005259 measurement Methods 0.000 abstract 1
- 238000012937 correction Methods 0.000 description 5
- 238000012545 processing Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000011017 operating method Methods 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 206010011224 Cough Diseases 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 230000006903 response to temperature 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
- B41J2/35—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
-
- 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
- B41J2/365—Print density control by compensation for variation in temperature
Landscapes
- Electronic Switches (AREA)
Abstract
Description
【発明の詳細な説明】
〔技術分野〕
本発明は、サーマル式記録装置の記録ヘッドの駆動条件
を温度に合せて補正するサーマルヘッドの駆動方法に関
する。DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a thermal head driving method for correcting the driving conditions of the recording head of a thermal recording apparatus according to the temperature.
プリンタやファクシミリなどの記録装置の記録方式とし
て、インクジェット式、ワイヤドツト式あるいはサーマ
ル式などが採用されている。2. Description of the Related Art As a recording method for recording devices such as printers and facsimile machines, an inkjet method, a wire dot method, a thermal method, etc. are used.
サーマル式は、さらに、普通シートにインクリボンのイ
ンクを加熱熔融転写する熱転写式と感熱シートを直接加
熱する感熱式がある。The thermal type further includes a thermal transfer type in which ink from an ink ribbon is transferred by heating and melting onto a regular sheet, and a thermal type in which a heat-sensitive sheet is directly heated.
また、記録装置では、プラテンに沿って主走査移動する
キャリジ上に記録ヘッドを搭載し、該キャリジを移動さ
せながら記録ヘッドを同期駆動するシリアル式記録装置
が広く採用されている。Furthermore, serial type printing apparatuses are widely used in which a print head is mounted on a carriage that moves in main scanning along a platen, and the print head is synchronously driven while the carriage is moved.
サーマル式記録装置は、複数の発熱抵抗体などの電気熱
変換体から成るドツト形成手段を記録ヘッド前面に設け
、印字データに基いて各電気熱変換体を駆動（通電）し
ながら所定のパターンを記録するものである。A thermal recording device is equipped with a dot forming means consisting of a plurality of electrothermal transducers such as heating resistors on the front surface of the recording head, and forms a predetermined pattern by driving (energizing) each electrothermal transducer based on print data. It is to be recorded.
ところで、サーマル式記録装置の記録ヘッド（サーマル
ヘッド）においては、印字速度を維持して印字品位を確
保するためには、サーマルヘッドを所定温度範囲に維持
したり、温度変化に対応してヒートパルス中（加熱時間
）を変化させるなどの調整操作が必要である。By the way, in the recording head (thermal head) of a thermal recording device, in order to maintain printing speed and ensure printing quality, it is necessary to maintain the thermal head within a predetermined temperature range or to apply heat pulses in response to temperature changes. Adjustment operations such as changing the medium (heating time) are required.
従来のサーマルヘッドの駆動方法にあっては、現在のヒ
ートパルス中を決定するのに、数列前までヒート履歴を
さかのぼり、これに基いて演算しヒート条件を決定する
方法が採用されていた。In the conventional method of driving a thermal head, in order to determine the current heat pulse, the heat history is traced back several rows and calculations are made based on this to determine the heat conditions.
例えば、あるドツト（発熱素子）について、１列前がヒ
ート○Ｎ、２列前がヒート○Ｎ、３列前がヒートＯＦＦ
であれば、この条件に基いて今回のヒートパルス巾（μ
秒単位）を決定するという方法で駆動していた。For example, for a certain dot (heating element), one row before is heat ○N, 2 rows before is heat ○N, and 3 rows before is heat OFF.
If so, based on this condition, the current heat pulse width (μ
It was driven by a method that determined the number of seconds (in seconds).
このため、印字品位を確保するためには履歴回数を多い
目に設定する必要があり、ヒート条件の算出に多大の処
理時間を必要とするという問題があった。Therefore, in order to ensure printing quality, it is necessary to set the number of history times to a large number, and there is a problem in that a large amount of processing time is required to calculate the heat conditions.
また、上記方法では、雰囲気温度によってもヒート時間
を調整する必要がある。このため、サーミスタ等の温度
センサを用いてサーマルヘッド付近の温度を検出し、上
述の履歴補正条件に加えて現在の補正条件を算出する必
要がある。Furthermore, in the above method, it is necessary to adjust the heating time depending on the ambient temperature. Therefore, it is necessary to detect the temperature near the thermal head using a temperature sensor such as a thermistor, and calculate the current correction conditions in addition to the above-mentioned history correction conditions.
したがって、従来のサーマルヘッドの駆動方法では、ヒ
ート条件（サーマルヘッド駆動条件）を決定するために
種々の演算を必要とし手間がかかる他、その結果が必ず
しも適格な条件にならない場合があった。Therefore, in the conventional thermal head driving method, various calculations are required to determine the heat conditions (thermal head driving conditions), which is time-consuming, and the results may not always be suitable conditions.
本発明の目的は、上記従来技術の問題を解決でき、補正
のための複雑な演算処理を必要とせず、容易にしかも確
実に最適なヒート条件を設定できるサーマルヘッドの駆
動方法を提供することである。An object of the present invention is to provide a method for driving a thermal head that can solve the above-mentioned problems of the prior art, and that can easily and reliably set optimal heat conditions without requiring complicated arithmetic processing for correction. be.
本発明は、駆動電圧を印加する直前にサーマルヘッドの
温度を検出し、この検出温度に基き予め設定されたパル
ス巾で電気熱変換体を駆動する方法により、上記目的を
達成するものである。The present invention achieves the above object by a method of detecting the temperature of a thermal head immediately before applying a driving voltage and driving an electrothermal transducer with a preset pulse width based on the detected temperature.
上記方法においては、サーマルヘッドの温度変化を電気
熱変換体の抵抗値変化で検出すれば、瞬時にしかも正確
に温度検出を行なうことができる。In the above method, if the temperature change of the thermal head is detected by the resistance value change of the electrothermal transducer, temperature can be detected instantaneously and accurately.
以下図面を参照して本発明を具体的に説明する。 The present invention will be specifically described below with reference to the drawings.
第３図は本発明方法を実施するのに好適なサーマル式記
録装置の概略構成を示す。FIG. 3 shows a schematic configuration of a thermal recording apparatus suitable for carrying out the method of the present invention.
第３図において、シート（用紙やプラスチック薄板など
の記録媒体）１をバックアップするプラテン２の前方に
はこれと平行にガイドレール３．３が設置され、これら
のガイドレールに沿って移動（主走査移動）するキャリ
ジ４にサーマルヘッド５が搭載されている。In Fig. 3, guide rails 3.3 are installed parallel to the platen 2 in front of the platen 2 that backs up the sheet (recording medium such as paper or a thin plastic plate) 1, and it moves along these guide rails (main scanning A thermal head 5 is mounted on a carriage 4 that moves.
なお、図示のプラテン２はローラ状をしており、シート
１を改行方向に搬送するシート送りローラを兼ねるもの
である。Note that the illustrated platen 2 has a roller shape and also serves as a sheet feeding roller that conveys the sheet 1 in the line feed direction.
前記、キヤ、リジ４は、図示の例では、キャリジモータ
６により、駆動ブーＩＪ ７、従動プーリ８およびこれ
らのプーリに張設されたタイミングベルト９から成る駆
動系によって制御される。In the illustrated example, the gear and the carriage 4 are controlled by a drive system including a carriage motor 6, a drive boob IJ 7, a driven pulley 8, and a timing belt 9 stretched around these pulleys.
前記サーマルヘッド５の前面には、複数（例えば２４ま
たは３２ドツト）の電気熱変換体（発熱抵抗体など）を
縦１列または複数列に配列して構成されたドツト形成手
段が設けられている。A dot forming means is provided on the front surface of the thermal head 5, and is configured by arranging a plurality (for example, 24 or 32 dots) of electrothermal transducers (heating resistors, etc.) in one or more vertical rows. .
第３図は熱転写式の場合を例示し、キャリジ４上には、
前記サーマルヘッド５とシート１との間ニインクリボン
１０を送給するためのリボンカセット１１が交換可能に
装着されている。FIG. 3 shows an example of a thermal transfer type, and on the carriage 4,
A ribbon cassette 11 for feeding a two-ink ribbon 10 is replaceably installed between the thermal head 5 and the sheet 1.
記録時には、サーマルヘッド５がインクリボン１０を介
してシート１に圧接され、キャリジ４を矢印Ｐ方向に主
走査移動させるとともにインクリボン１０を同じ速度で
送給しながら、サーマルヘッド５のドツト形成手段を印
字データに基いて駆動することにより所定のパターンの
記録が行われる。During recording, the thermal head 5 is pressed against the sheet 1 via the ink ribbon 10, and the dot forming means of the thermal head 5 moves the carriage 4 in the main scanning direction in the direction of arrow P and feeds the ink ribbon 10 at the same speed. A predetermined pattern is recorded by driving the printer based on print data.
第１図は第３図中のサーマルへノド５のドツト形成手段
を駆動する駆動システムを例示する。FIG. 1 illustrates a drive system for driving the dot forming means of the thermal nozzle 5 in FIG.
第１図において、記録装置のｃｕｐ ＜中央演算処理回
路）２０にはＲＯＭ２１およびＲＡＭ２２が接続され、
ＲＯＭ２１には例えば制御プログラムおよび補正データ
（温度変化によるヒート巾の補正データ等を含む）が格
納されており、ＲＡＭ２２はコンピュータ等のホスト機
からのデータおよび指令を記憶する化サーマルヘッド５
のドツト形成手段を構成する各発熱抵抗体（電気熱変換
体）２３−１．２３−２−・−・・−・・・−・２３−
Ｎの抵抗値を記憶するのに使用される。In FIG. 1, a ROM 21 and a RAM 22 are connected to a cup (central processing circuit) 20 of the recording device.
The ROM 21 stores, for example, control programs and correction data (including correction data for heat width due to temperature changes, etc.), and the RAM 22 stores a thermal head 5 that stores data and commands from a host machine such as a computer.
Each heating resistor (electrothermal converter) 23-1.
Used to store the resistance value of N.
ＣＰＵ２０からの制御信号はインターフェース用ＬＳＩ
２４を介してサーマルヘッド５駆動用のドライバー（駆
動回路）２５へ伝送され、該ドライバーからの駆動電流
は切換えスイッチ２６を介してサーマルヘッド５のドツ
ト形成手段へ供給される。前記ドライバー２５からはド
ツト形成手段の各電気熱変換体２３−１．２３−２・・
・−・・−・・−ごとに駆動電流が出力され、前記切換
えスイッチ２６は各電気熱変換体ごとにその駆動電流回
路をオン・オフするよう構成されている。The control signal from the CPU 20 is provided by the interface LSI.
24 to a driver (drive circuit) 25 for driving the thermal head 5, and the drive current from the driver is supplied to the dot forming means of the thermal head 5 via a changeover switch 26. From the driver 25, the electrothermal transducers 23-1, 23-2, etc. of the dot forming means are connected.
A drive current is output for each electrothermal converter, and the changeover switch 26 is configured to turn on and off the drive current circuit for each electrothermal converter.
一方、前記ＣＩ） Ｕ ２０およびＲＡＭ２２には各電
気熱変換体２３−１．２３−２−・・−・−・−・の抵
抗値をデータに変換するためのＡ／Ｄコンパ・−夕２７
が接続され、前記切換えスイッチ２６を切換えた時（駆
動電流回路をオフにしたとき）各電気熱変換体２３−１
．２３−２−・−・−・−・−が咳Ａ／Ｄコンバータの
方へ導通されそれらの抵抗値を個別的に検出するよう構
成されている。On the other hand, the CI) U 20 and the RAM 22 are equipped with an A/D comparator 27 for converting the resistance values of the electrothermal converters 23-1, 23-2, . . . , into data.
is connected, and when the changeover switch 26 is switched (when the drive current circuit is turned off), each electrothermal converter 23-1
．． 23-2-.--.-- are connected to the cough A/D converter and their resistance values are individually detected.
然して、前記切換えスイッチ２６の切換えタイミングす
なわち、ヘッド駆動電流回路をオフにして電気熱変換体
２３−１．２３−２−・−・・−・−・の抵抗値を測定
するタイミングは、これら各電気熱変換体へ駆動電圧を
印加する直前に設定されている。However, the switching timing of the changeover switch 26, that is, the timing of turning off the head drive current circuit and measuring the resistance values of the electrothermal transducers 23-1, 23-2-. It is set immediately before applying the driving voltage to the electrothermal converter.
各電気熱変換体２３−１．２３−２・−−−・・・・の
抵抗値はその温度によって変化する。The resistance value of each electrothermal transducer 23-1, 23-2, etc. changes depending on its temperature.
然して、前記ＲＯＭ２１には、抵抗値変化に応じて、ヘ
ッド駆動電圧印加時間すなわち駆動用のパルス巾を算出
するプログラムが格納されている。However, the ROM 21 stores a program for calculating the head driving voltage application time, that is, the driving pulse width, in accordance with the resistance value change.
第２図は第１図の制御系の動作手順を示すフローチャー
トであり、以下第１図および第２図を参照して以上の記
録装置のサーマルヘッドの駆動動作を説明する。FIG. 2 is a flowchart showing the operating procedure of the control system of FIG. 1, and the driving operation of the thermal head of the above recording apparatus will be explained below with reference to FIGS. 1 and 2.
第１図および第２図において、ステップ１００で電源投
入した後、切換えスイッチ２６を第１図とは逆の方向へ
切換え、Ａ／Ｄコンバータ２７でサーマルヘッド５の各
電気熱変換体２３−１．２３−２−・・−・・・・・・
−２３−Ｎの抵抗値を測定する。1 and 2, after turning on the power in step 100, the changeover switch 26 is switched in the opposite direction to that in FIG. .23-2-・・・・・・・・・
-23-Measure the resistance value of N.
ステップ１０１で、この測定値Ｒ（１）、Ｒ（２）・・
・・−一一一一・−Ｒ（Ｎ）をＲＡＭ２２にＭ （１）
、Ｍ（２）、・・−・−・・Ｍ （Ｎ）として記憶さ
せ、ＣＰＵ２０でこれらの抵抗値を各電気熱変換体２３
−１．２３−２・・・・−・・−２３−Ｎの初期抵抗値
すなわちこれらと一定の対応関係にある初期温度とする
。In step 101, the measured values R(1), R(2)...
...-1111--R(N) to RAM22 M (1)
, M(2), . . . M (N), and the CPU 20 stores these resistance values in each electrothermal transducer 23.
-1.23-2...--23-N are the initial resistance values, that is, the initial temperatures have a certain correspondence with these values.
上記抵抗値を測定した後直ちに切換えスイッチ°２６は
第１図の状態すなわちヘッド駆動回路閉成の状態に戻さ
れる。Immediately after measuring the resistance value, the selector switch 26 is returned to the state shown in FIG. 1, that is, the state in which the head drive circuit is closed.
キャリジ走査の最初の位置すなわち最初のドツト列をヒ
ート（駆動）する場合は、ステップ１０２において、前
記初期温度により決定される時間（パルス巾）駆動電圧
を印加して記録する。When heating (driving) the first position of the carriage scan, that is, the first dot row, in step 102, a driving voltage is applied for a time (pulse width) determined by the initial temperature and recorded.
次のドツト列をヒートする場合は、このヒート開始の直
前に、前述と同様、切換えスイッチ２６を切換え、Ａ／
Ｄコンバータ２７で各電気熱変換体２３−１．２３−２
−・−・−・−の抵抗値をｒ（１）、ｒ （２）・・・
−・−・−を測定し、ステップ１０３でこれらをｍ （
１） 、ｍ （２） −＝−−＝としてＲＡＭ２２に記
憶させる。When heating the next dot row, just before starting this heating, switch the changeover switch 26 as described above, and
Each electrothermal converter 23-1.23-2 in the D converter 27
−・−・−・− resistance value r (1), r (2)...
−・−・− are measured, and in step 103 these are m (
1) , m (2) -=--= and stored in the RAM 22.
然る後、ＣＰＵ２０において、ステップ１０１で予めＲ
ＡＭ２２に記憶させておいた初期温度データＭ （１）
、Ｍ （２）−−−−とこのｍ（１）、ｍ（２）・・
・・・−・・−とを比較し、ステップ１０４において、
予めＲＯＭ２１に記憶されている各温度でのヘッド駆動
時間（パルス巾）の対照表（ヒートテーブル）に基いた
ヒートパルス巾で、各電気熱変換体２３−１．２３−２
−・−・−・−に駆動電圧を印加し、記録する。After that, the CPU 20 performs R in advance in step 101.
Initial temperature data M stored in AM22 (1)
, M (2)---- and this m(1), m(2)...
...--, and in step 104,
Each electrothermal converter 23-1, 23-2 is heated with a heat pulse width based on a comparison table (heat table) of head driving time (pulse width) at each temperature stored in the ROM 21 in advance.
Apply driving voltage to −・−・−・− and record.
以下各ドツト列ごとに上記動作を繰返しながらサーマル
ヘッド５を駆動し２シートに記憶していく。Thereafter, the thermal head 5 is driven while repeating the above operation for each dot row, and the data is stored on two sheets.
すなわち、サーマルヘッド駆動直前に実際のサーマルヘ
ッド（電気熱変換体）の温度を測定（検出）し、該温度
に対し予め設定された適正中（適正時間）各電気熱変換
体（発熱抵抗体など）２３−１．２３−２・−・−・−
を駆動く電圧印加）しながら記録動作を行っていく。That is, the temperature of the actual thermal head (electrothermal converter) is measured (detected) immediately before the thermal head is driven, and each electrothermal converter (heating resistor, etc. )23-1.23-2・−・−・−
The recording operation is performed while applying a driving voltage.
以上説明した実施例によれば、サーマルヘッド５の駆動
回路において、駆動電圧印加直前に、該サーマルヘッド
の各電気熱変換体（発熱抵抗体など）２３−１．２３−
２・・−一−−−−−・２３−Ｎの温度変化による抵抗
値変化を検知し、記ｔ？のだめの駆動電圧の印加時間（
パルス巾）を該抵抗値変化に応じて制御するので、宝に
、迅速確実に−・ソド温度に対する最適な印加電圧パル
ス中を決定することができ、印字速度や印字時間などで
温度が変動する場合でも、常に安定した高い印字品位の
記録を行うことが可能になった。According to the embodiment described above, in the drive circuit of the thermal head 5, each electrothermal transducer (heating resistor, etc.) 23-1, 23- of the thermal head immediately before applying the drive voltage.
2...-1-------23-Detect the change in resistance value due to temperature change, and record t? Nodame driving voltage application time (
Since the pulse width (pulse width) is controlled according to the resistance value change, it is possible to quickly and reliably determine the optimum applied voltage pulse duration for the temperature, and the temperature fluctuates depending on the printing speed, printing time, etc. It is now possible to always perform stable, high-quality recording even when the print quality is high.
〔効果］
以上の説明から明らかなごとく、本発明によれば、駆動
電圧を印加する直前にサーマルヘッドの温度を検出し、
この検出温度に基き予め設定されたパルス巾で電気熱変
換体を駆動するので、ヘッド温度の変動に対し常に最適
の印加電圧パルス中を容易に決定することができ、安定
した高品位の印字を行いうるサーマルヘッドの駆動方法
が得られる。[Effects] As is clear from the above description, according to the present invention, the temperature of the thermal head is detected immediately before applying the drive voltage,
Since the electrothermal transducer is driven with a preset pulse width based on this detected temperature, it is possible to easily determine the optimum applied voltage pulse for fluctuations in head temperature, ensuring stable, high-quality printing. A method of driving a thermal head that can be performed is obtained.
第１図は本発明によるサーマルヘッドの駆動方法を実施
するのに好適な制御システムを例示するプロンク図、第
２図は第１図の制御システムの動作手順を示すフローチ
ャート、第３図は本発明方法を実施するのに好適なサー
マル式記録装置の模式的斜視図である。
５・−・−−−−−・−サーマルヘッド、２０−−−−
−−−−ＣＰ Ｕ 。
２３−１．２３−２−・−・−２３−Ｎ・・・−・−・
−１電気熱変換体、２６−−−−−・・・・−切換えス
イッチ、２７−・−−−−−−−Ａ／Ｄコンバータ。FIG. 1 is a Pronk diagram illustrating a control system suitable for carrying out the method of driving a thermal head according to the present invention, FIG. 2 is a flowchart showing the operating procedure of the control system of FIG. 1, and FIG. 3 is a diagram according to the present invention. 1 is a schematic perspective view of a thermal recording device suitable for carrying out the method; FIG. 5.------Thermal head, 20-----
-----CPU. 23-1.23-2-・-・-23-N・・・-・-・
-1 electrothermal converter, 26-------- changeover switch, 27-----A/D converter.
Claims (2)
を検出し、この検出温度に基き予め設定されたパルス巾
で電気熱変換体を駆動することを特徴とするサーマルヘ
ッドの駆動方法。(1) A method for driving a thermal head, comprising: detecting the temperature of the thermal head immediately before applying a driving voltage, and driving an electrothermal transducer with a preset pulse width based on the detected temperature.
検出することを特徴とする特許請求の範囲第１項記載の
サーマルヘッドの駆動方法。(2) A method for driving a thermal head according to claim 1, characterized in that the temperature of the thermal head is detected by the resistance value of an electrothermal transducer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19317486A JPS6349459A (en) | 1986-08-19 | 1986-08-19 | Thermal head driving method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19317486A JPS6349459A (en) | 1986-08-19 | 1986-08-19 | Thermal head driving method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6349459A true JPS6349459A (en) | 1988-03-02 |
Family
ID=16303531
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP19317486A Pending JPS6349459A (en) | 1986-08-19 | 1986-08-19 | Thermal head driving method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6349459A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0718107A2 (en) * | 1994-12-20 | 1996-06-26 | Nec Corporation | Thermal head apparatus |
-
1986
- 1986-08-19 JP JP19317486A patent/JPS6349459A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0718107A2 (en) * | 1994-12-20 | 1996-06-26 | Nec Corporation | Thermal head apparatus |
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