JPH0270459A - Thermal printer - Google Patents
Thermal printerInfo
- Publication number
- JPH0270459A JPH0270459A JP22271688A JP22271688A JPH0270459A JP H0270459 A JPH0270459 A JP H0270459A JP 22271688 A JP22271688 A JP 22271688A JP 22271688 A JP22271688 A JP 22271688A JP H0270459 A JPH0270459 A JP H0270459A
- Authority
- JP
- Japan
- Prior art keywords
- printing
- rate
- temperature change
- thermal head
- section
- 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
- 239000000758 substrate Substances 0.000 claims description 2
- 238000009825 accumulation Methods 0.000 abstract description 2
- 230000004075 alteration Effects 0.000 abstract 1
- 230000002401 inhibitory effect Effects 0.000 abstract 1
- 238000001514 detection method Methods 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 230000003247 decreasing effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 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
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、サー４＃ヘッドを用いた熱的な記録装置とし
てのサーマルプリンタに関するものである。DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a thermal printer as a thermal recording device using a 4# head.
従来の技術
従来、サーマルヘッドに通電パルスを与えて熱し、印字
を行うサーマルプリンタにおいては、連続使用の場合、
サーマルヘッド上の発熱抵抗体からの熱が蓄積され印字
濃度が変化するため、サーマルヘッド近傍に温度検出手
段を設け、その温度に応じてサーマルヘッドへの通電時
間を制御し、常に一定の印字濃度が得られるようにして
いた。Conventional technology Conventionally, in a thermal printer that prints by heating the thermal head by applying an energizing pulse, when used continuously,
Since heat from the heat generating resistor on the thermal head accumulates and the print density changes, a temperature detection means is installed near the thermal head and the energization time to the thermal head is controlled according to the temperature to maintain a constant print density. I was trying to get it.
発明が解決しようとする課題
しかしながら、上記の従来の制御は、サーマルヘッド上
の発熱抵抗体から発生した熱が温度検出手段に伝わるま
での時間的な遅れにより、現在制御している温度と実際
の発熱抵抗体の温度が異なっている場合があり、印字品
質の劣化を招いていた。Problems to be Solved by the Invention However, in the conventional control described above, there is a time delay until the heat generated from the heating resistor on the thermal head is transmitted to the temperature detection means, so that the currently controlled temperature may differ from the actual temperature. The temperature of the heating resistor may be different, leading to deterioration of printing quality.
本発明は、このような従来の問題点を解消し、高品質の
印字を得ることを目的とする。The present invention aims to solve these conventional problems and obtain high-quality printing.
課題を解決するための手段
この目的を達成するために本発明は、過去のあるライン
から今回のラインまでに通電された全ドツト数をカウン
トする手段と、そのカウント数からサーマルヘッド基板
上の温度変化を予測し今回のサーマルヘッド通電時間の
補正演算を行う手段と、この補正値に従ってサーマルヘ
ッドの通電時間を制御する手段とを備えた構成のもので
ある。Means for Solving the Problems In order to achieve this object, the present invention provides means for counting the total number of dots energized from a certain line in the past to the current line, and calculating the temperature on the thermal head substrate from the counted number. This configuration includes means for predicting the change and calculating a correction for the current thermal head energization time, and means for controlling the thermal head energization time in accordance with this correction value.
作用
この構成によって、過去の通電ドツト数から印字率を求
め、その印字率からサーマルヘッドの温度変化を予測し
、次回の通電時間をサーマルヘッドの温度変化分に相当
する時間だけ増減することにより一定の印字濃度を得る
ことができる。Effect With this configuration, the printing rate is determined from the past number of energized dots, the temperature change of the thermal head is predicted from that printing rate, and the next energization time is increased or decreased by the time equivalent to the temperature change of the thermal head, thereby making it constant. It is possible to obtain a print density of
実施例
以下、本発明の一実施例のサーマルプリンタについて図
面を参照して説明する。Embodiment Hereinafter, a thermal printer according to an embodiment of the present invention will be described with reference to the drawings.
第１図に示すように、通電ドツト数カウント部３に入力
された印字データは、過去のあるラインから現在までの
通電ドツトがカウントされ、印字率情報として温度変化
予測部４に送られる。As shown in FIG. 1, the print data input to the energized dot number counting section 3 counts the energized dots from a certain line in the past to the present, and is sent to the temperature change prediction section 4 as printing rate information.
温度変化予測部４は、通電ドツト数カウント部３でカウ
ントされた印字率情報により、低印字率高印字率まで一
定の割合で、温度変化分に相当する通電時間を増減して
いく、印字率によって決定される通電時間は、常に一定
の印字濃度が得られるように、搭載されるプリンタメカ
ニズムや使用されるサーマルヘッドに合わせて実験ある
いは経験的に決定され、駆動制御部１へ送られる。The temperature change prediction unit 4 increases or decreases the energization time corresponding to the temperature change at a constant rate from the printing rate information counted by the energized dot number counting unit 3 to a low printing rate and a high printing rate. The energization time determined by is determined experimentally or empirically in accordance with the installed printer mechanism and the thermal head used so that a constant print density is always obtained, and is sent to the drive control section 1.
駆動制御部１は、印字データと温度変化予測部４によっ
て決定された通電時間に従ってサーマルヘッド２に通電
パルスを与える。The drive control section 1 applies an energization pulse to the thermal head 2 according to the print data and the energization time determined by the temperature change prediction section 4 .
このように過去の印字率からサーマルヘッドの温度変化
を予測し、温度変化分に相当する通電時間を増減して印
加することにより、サーマルヘッドの蓄熱による印字濃
度変化を抑えることができる。In this way, by predicting the temperature change of the thermal head from the past printing rate and increasing or decreasing the energization time corresponding to the temperature change, it is possible to suppress the change in print density due to heat accumulation in the thermal head.
発明の効果
以上のように本発明のサーマルプリンタは、温度変化の
予測によって通電時間を制御するため、温度検出手段を
設けずに済むことから制御が簡単でかつ安価に一定の印
字濃度が得る制御ができ、実用上きわめて有利なもので
ある。Effects of the Invention As described above, the thermal printer of the present invention controls the energization time by predicting temperature changes, so there is no need to provide a temperature detection means, so the control is simple and inexpensive, and a constant print density can be achieved. This is extremely advantageous in practice.
第１図は本発明の一実施例によるサーマルプリンタの要
部を示すブロック図である。
１・・・・・・駆動制御部、２・・・・・・サーマルヘ
ッド、３・・・・・・通電ドツト数カウント部、４・・
・・・・温度変化予測部。
代理人の氏名 弁理士 粟 野 重 孝 ほか１名／−
−−駆ｖＪ別！８部
２゛°ブーマルヘツド
３− 涌」叱ドツト数カウント都FIG. 1 is a block diagram showing the main parts of a thermal printer according to an embodiment of the present invention. 1... Drive control section, 2... Thermal head, 3... Energized dot number counting section, 4...
...Temperature change prediction section. Name of agent: Patent attorney Shigetaka Awano and 1 other person/-
--Kuki vJ is different! Part 8 2゛° Boomerhead 3- Waku'' scolding dot count capital
Claims (1)
ドット数をカウントする手段と、そのカウント数からサ
ーマルヘッド基板上の温度変化を予測し今回のサーマル
ヘッド通電時間の補正演算を行う手段と、この補正値に
従ってサーマルヘッドの通電時間を制御する手段とを備
えたサーマルプリンタ。means for counting the total number of dots energized from a past line to the current line, and means for predicting temperature changes on the thermal head substrate from the counted number and performing correction calculations for the current thermal head energization time; and means for controlling the energization time of the thermal head according to the correction value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22271688A JPH0270459A (en) | 1988-09-06 | 1988-09-06 | Thermal printer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22271688A JPH0270459A (en) | 1988-09-06 | 1988-09-06 | Thermal printer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0270459A true JPH0270459A (en) | 1990-03-09 |
Family
ID=16786789
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP22271688A Pending JPH0270459A (en) | 1988-09-06 | 1988-09-06 | Thermal printer |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0270459A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002103622A (en) * | 2000-09-28 | 2002-04-09 | Canon Inc | Recorder and method for estimating temperature |
-
1988
- 1988-09-06 JP JP22271688A patent/JPH0270459A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002103622A (en) * | 2000-09-28 | 2002-04-09 | Canon Inc | Recorder and method for estimating temperature |
| JP4510259B2 (en) * | 2000-09-28 | 2010-07-21 | キヤノン株式会社 | Recording apparatus and temperature estimation method |
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