JPH0160433B2 - - Google Patents
Info
- Publication number
- JPH0160433B2 JPH0160433B2 JP56150768A JP15076881A JPH0160433B2 JP H0160433 B2 JPH0160433 B2 JP H0160433B2 JP 56150768 A JP56150768 A JP 56150768A JP 15076881 A JP15076881 A JP 15076881A JP H0160433 B2 JPH0160433 B2 JP H0160433B2
- Authority
- JP
- Japan
- Prior art keywords
- energization time
- signal
- energization
- circuit
- heating resistor
- 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.)
- Expired
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)
Description
【発明の詳細な説明】
本発明は感熱記録装置に係り、特に発熱抵抗体
への通電時間を制御することにより、高速記録を
可能とした感熱記録装置に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a heat-sensitive recording device, and more particularly to a heat-sensitive recording device that enables high-speed recording by controlling the time during which electricity is applied to a heating resistor.
感熱記録装置は記録素子である複数個の発熱抵
抗体を並設し、この発熱抵抗体を記録信号に応じ
て選択的に通電発熱させることにより感熱記録紙
に記録を行うようになつている。 A thermal recording apparatus has a plurality of heating resistors, which are recording elements, arranged in parallel, and performs recording on thermal recording paper by selectively energizing the heating resistors to generate heat according to a recording signal.
しかし発熱抵抗体の熱応答速度に限界があるた
め高速で連続的に通電パルスを加えると、各パル
スによる発熱抵抗体の温度のピーク値が次第に上
昇し、発熱抵抗体の劣化、記録品質の低下をもた
らす欠点がある。 However, since there is a limit to the thermal response speed of the heating resistor, if energization pulses are applied continuously at high speed, the peak value of the temperature of the heating resistor due to each pulse will gradually rise, causing deterioration of the heating resistor and a decrease in recording quality. There are drawbacks that lead to
このような欠点を除くためには、発熱抵抗体の
通電時間を前回信号が０（白画像）で今回信号が
１（黒画像）の場合の通電時間t2に対し、前回、
今回信号共に１（黒画像）である場合の通電時間
t1の方が短かくなり、しかもこのt1として各回の
通電時間間隔t3がフアクシミリ受信の場合のよう
に変化しても各通電パルスによる発熱抵抗体のピ
ーク温度が近似的に一定になるようにすることが
望ましい。 In order to eliminate such drawbacks, it is necessary to change the energization time of the heating resistor to the energization time t 2 when the previous signal was 0 (white image) and the current signal was 1 (black image).
Power-on time when both signals are 1 (black image) this time
t 1 is shorter, and even if the energization time interval t 3 changes as in the case of facsimile reception, the peak temperature of the heating resistor due to each energization pulse remains approximately constant. It is desirable to do so.
上述した通電時間制御方法において通電時間間
隔t3に応じて前回、今回共１（黒画像）の場合の
通電時間t1を決定する回路として従来は第１図に
示すものが使用されている。 In the above-described energization time control method, the circuit shown in FIG. 1 has conventionally been used as a circuit for determining the energization time t 1 for both the previous and current 1 (black image) according to the energization time interval t 3 .
即ち、抵抗器RT１とコンデンサCT２とにより
決る時定数をもつてCT・RT回路を含む単安定マ
ルチバイブレータであり、入力端子３より可変な
時間間隔t3で送られるトリガ信号により出力端子
４は閉状態となり、端子５の電位Ｖ
が抵抗器１
とコンデンサ２による時定数即ちCT・RTで変化
する。このCT・RTは発熱抵抗体の熱時定数τ1と
等しくしてあり、電位Ｖ
が発熱抵抗体の温度を
シミユレートする。一方抵抗６と抵抗７の分圧に
より端子８に基準定電位Ｖ
を設定すればＶ
が
変化してＶ
に等しくなつた時点でコンパレータ
９の出力端子４は開状態となり、通電時間t1を決
定することになる。 That is, it is a monostable multivibrator that includes a C T R T circuit with a time constant determined by a resistor R T 1 and a capacitor C T 2, and a trigger signal sent from an input terminal 3 at a variable time interval t 3 . As a result, the output terminal 4 becomes closed, and the potential V of the terminal 5 becomes the resistor 1.
and the time constant due to capacitor 2, that is, C T and R T. This C T · RT is made equal to the thermal time constant τ 1 of the heating resistor, and the potential V simulates the temperature of the heating resistor. On the other hand, if a reference constant potential V is set at the terminal 8 by dividing the voltage between the resistors 6 and 7, the output terminal 4 of the comparator 9 will be in an open state when V changes and becomes equal to V , and the energization time t 1 will be determined. I will do it.
然るに上述の通電時間決定回路では、発熱抵抗
体の温度をCT・RT回路によりシミユレートして
いるため、その精度には限界がある。即ち、
CT・RT回路の電位Ｖ
は（１−e-t/CT However, in the above-mentioned energization time determining circuit, the temperature of the heating resistor is simulated by the C T and R T circuit, so there is a limit to its accuracy. That is,
The potential V of the C T /R T circuit is (1-e -t/CT
Claims (1)
熱抵抗体に一連の記録信号に応じて選択的に通電
を行う駆動回路と、この駆動回路に供給する一連
の記録信号情報を記憶する第１の記憶回路と、こ
の第１の記憶回路に記憶される一時刻前の一連の
記録信号情報を記憶する第２の記憶回路と、これ
ら第１及び第２の記憶回路に記憶された記録信号
情報を相対応するビツト毎に対照した結果、前回
信号が白画像で今回信号が黒画像の前記発熱抵抗
体に対する通電時間より、前回信号及び今回信号
が共に黒画像の前記発熱抵抗体に対する通電時間
が所定時間だけ短かくなるようにする通電時間制
御回路と、前記発熱抵抗体に隣接して設けられた
複数個のダミー抵抗体と、このダミー抵抗体を順
次通電しながら通電中の前記ダミー抵抗体の温度
を抵抗温度係数を利用して検出し、前記温度が一
定基準に達した時点で通電を停止する信号を前記
通電時間制御回路に送り、前記通電時間制御回路
により前記発熱抵抗体への通電を停止させる通電
時間決定回路とを具備することを特徴とする感熱
記録装置。1 A plurality of heat generating resistors arranged in parallel, a drive circuit that selectively energizes these heat generating resistors according to a series of recording signals, and a drive circuit that stores a series of recording signal information to be supplied to the drive circuit. a second storage circuit that stores a series of recorded signal information one time before stored in the first storage circuit; and a recorded signal stored in these first and second storage circuits. As a result of comparing the information for each corresponding bit, it is found that the energization time for the heating resistor for which the previous signal and current signal are both black images is determined from the energization time for the heating resistor for which the previous signal was a white image and the current signal was a black image. an energization time control circuit for shortening by a predetermined period of time; a plurality of dummy resistors provided adjacent to the heat generating resistor; The temperature of the body is detected using the resistance temperature coefficient, and when the temperature reaches a certain standard, a signal to stop energization is sent to the energization time control circuit, and the energization time control circuit controls the heating resistor. 1. A thermal recording device comprising: an energization time determining circuit for stopping energization.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56150768A JPS5853461A (en) | 1981-09-25 | 1981-09-25 | Heat-sensitive recorder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56150768A JPS5853461A (en) | 1981-09-25 | 1981-09-25 | Heat-sensitive recorder |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5853461A JPS5853461A (en) | 1983-03-30 |
| JPH0160433B2 true JPH0160433B2 (en) | 1989-12-22 |
Family
ID=15503987
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP56150768A Granted JPS5853461A (en) | 1981-09-25 | 1981-09-25 | Heat-sensitive recorder |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5853461A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6342877A (en) * | 1986-08-11 | 1988-02-24 | Canon Inc | Thermal-type recorder |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5716900B2 (en) * | 1973-11-26 | 1982-04-07 | ||
| JPS5175530A (en) * | 1974-12-26 | 1976-06-30 | Sharp Kk | SAAMARUPURINTANOINJINODOHOSHOSOCHI |
| JPS57116669A (en) * | 1981-01-13 | 1982-07-20 | Omron Tateisi Electronics Co | Heating and controlling method in heat sensitive printer |
-
1981
- 1981-09-25 JP JP56150768A patent/JPS5853461A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5853461A (en) | 1983-03-30 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US5132709A (en) | Apparatus and method for closed-loop, thermal control of printing head | |
| JPS5814665A (en) | Temperature controlling system of heat-sensitive recorder | |
| JPS6156654B2 (en) | ||
| JPH0160433B2 (en) | ||
| JPH0369714B2 (en) | ||
| JPH06198943A (en) | Thermal head | |
| JPH0377067B2 (en) | ||
| JPS63173669A (en) | Thermal printer printing control device | |
| JPS6076363A (en) | Heat-sensitive recording device | |
| JPS6160781B2 (en) | ||
| JPS6067178A (en) | Driver for thermal head | |
| JPH0679857B2 (en) | Thermal recording head control method | |
| JP2552703B2 (en) | Halftone recording method | |
| JPS6239107B2 (en) | ||
| JPS627497Y2 (en) | ||
| JP2511258B2 (en) | Thermal printer | |
| JPS6227994B2 (en) | ||
| JPS60151073A (en) | Thermal head driving circuit | |
| JPS61184968A (en) | Thermal head driving circuit | |
| JPS63166559A (en) | Thermal-type multigradation recorder | |
| JP2598079B2 (en) | Halftone recording device | |
| JPH0527549B2 (en) | ||
| JPH04152151A (en) | Printing density correction data generating device and thermal recorder using correction data of the device | |
| JPS59152878A (en) | Gradation-controlling system for thermal printer | |
| JPS5928758A (en) | thermal recording device |