JPS63114672A - Driving controller for printing head - Google Patents

Driving controller for printing head

Info

Publication number
JPS63114672A
JPS63114672A JP26149886A JP26149886A JPS63114672A JP S63114672 A JPS63114672 A JP S63114672A JP 26149886 A JP26149886 A JP 26149886A JP 26149886 A JP26149886 A JP 26149886A JP S63114672 A JPS63114672 A JP S63114672A
Authority
JP
Japan
Prior art keywords
head
printing
driving
signal
circuit
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
Application number
JP26149886A
Other languages
Japanese (ja)
Inventor
Saichi Morikawa
森川　佐一
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NEC Corp
Original Assignee
NEC Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by NEC Corp filed Critical NEC Corp
Priority to JP26149886A priority Critical patent/JPS63114672A/en
Publication of JPS63114672A publication Critical patent/JPS63114672A/en
Pending legal-status Critical Current

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

Abstract

PURPOSE:To maintain a fixed printed density irrespective of variations in the ambient temperature and enhance printing quality, by providing a temperature- detecting means in the vicinity of a printing head, and outputting to the printing head a preheating signal current with a predetermined duty cycle corresponding to the level of an output from the temperature-detecting means. CONSTITUTION:A microprocessor 1 supplied with a signal from a temperature- detecting means 4 constantly controls the driving of a preheating signal generating circuit 5 to generate a pulse signal with such a duty cycle as not to cause printing, according to a detected temperature, and a pulse signal BP outputted from the circuit 5 is sent to OR circuits 61-6n, to which head-driving signals are sent. Printing heads 21-2n are preheated through the OR circuits 61-6n and head-driving circuits 31-3n for printing. While the OR of the head-driving signal HDS and the pulse signal BP for preheating which are inputted to the OR circuit 61-6n is '1', the corresponding head-driving circuit 31-3n supplies a driving current DC to the corresponding printing head 21-2n.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、印字ヘッド駆動制御装置に関し、特に熱転写
方式、怒熱方式等、印字ヘッドの瞬間的発熱によって印
字を行う方式のプリンタに好適な印字ヘッド駆動制御装
置に関する。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a print head drive control device, and is particularly suitable for printers of a type that prints by instantaneous heat generation of the print head, such as a thermal transfer type or an angry heat type. The present invention relates to a print head drive control device.

（従来の技術〕 従来、この種のプリンタのヘッドドライブ回路は第２図
に示すように、印字すべき時にのみ一定電流を印字ヘッ
ド１２１，１２□、・・・・・・、１２゜に供給するヘ
ッドドライブ回路１１．．１１２゜・・・・・・、１１
．、と、印字ヘッド１２．〜１２゜に常時印字しない程
度の一定電流を供給するヒートバイアス回路１３１，１
３□、・・・・・・、１３．とを、それぞれ印字ヘッド
毎に有していた。(Prior Art) Conventionally, as shown in Fig. 2, the head drive circuit of this type of printer supplies a constant current to the print heads 121, 12□, . . . , 12° only when printing is to be performed. Head drive circuit 11..112°...11
．． , and print head 12. Heat bias circuit 131, 1 that supplies a constant current that does not constantly print at ~12°
3□,...,13. Each print head had one.

〔発明が解決しようとする問題点〕[Problem that the invention seeks to solve]

しかしながら、上記従来例では、例えば漢字を印字する
ためヘッド数が２４必要であれば２４回路、３２のヘッ
ド数が必要であれば３２回路というように、印字ヘッド
１１の数に対応するだけヒートバイアス回路１３が必要
となり、回路の複雑化、原価高を招くという不都合があ
った。また、上記従来例では、ヒートバイアス電流が常
時一定であるために、印字ヘッド周辺の温度の高低によ
り、インクの転写度合、感熱紙の発色度合等がばらつき
、良好な印字が得られないという問題があった。However, in the above conventional example, for example, if 24 heads are required to print Kanji characters, 24 circuits are required, and if 32 heads are required, 32 circuits are required. The circuit 13 is required, which has the disadvantage of complicating the circuit and increasing the cost. In addition, in the conventional example described above, since the heat bias current is always constant, the degree of ink transfer and the degree of coloring of the thermal paper vary depending on the temperature around the print head, making it impossible to obtain good prints. was there.

〔発明の目的〕[Purpose of the invention]

本発明は、上記従来例の有する不都合を改善し、周囲温
度の変化にあっても常に鮮明な印字を行うことを可能と
した印字ヘッド駆動制御装置を提供することを、その目
的とする。SUMMARY OF THE INVENTION It is an object of the present invention to provide a print head drive control device that improves the disadvantages of the conventional example and makes it possible to always perform clear printing even under changes in ambient temperature.

〔問題点を解決するための手段〕[Means for solving problems]

本発明は、複数の印字ヘッドに対応して印字用の加熱信
号を出力する複数のヘッド駆動回路と、この各駆動回路
を駆動制御するマイクロプロセッサとを備えている。印
字ヘッドの近傍に、温度検出手段を装備するとともに、
この温度検出手段の出力レベルに対応した所定のデユー
ティサイクルのプリヒート用信号電流を前記印字ヘッド
用として出力するプリヒート用信号発生回路を設けると
いう構成を採っている。The present invention includes a plurality of head drive circuits that output heating signals for printing corresponding to a plurality of print heads, and a microprocessor that drives and controls each of the drive circuits. Equipped with temperature detection means near the print head,
A configuration is adopted in which a preheating signal generation circuit is provided for outputting a preheating signal current for the print head with a predetermined duty cycle corresponding to the output level of the temperature detection means.

〔発明の実施例〕 以下、本発明の一実施例を第１図に基づいて説明する。[Embodiments of the invention] An embodiment of the present invention will be described below with reference to FIG.

この第１図の実施例は、複数の印字ヘッド２゜、２２．
・・・・・・＋２ｎに対応して印字用の加熱信号を出力
する複数のヘッド駆動回路３１，３□、・・・・・・、
３７と、この各ヘッド駆動回路３１〜３７を各別にヘッ
ド駆動信号を出力するマイクロプロセ・ノサ１と、前記
印字ヘッド２．〜２ｏの近傍に装備された温度検出手段
４と、この温度検出手段４の出力レベルに対応した所定
のデユーティサイクルのプリヒート用駆動信号ＢＰを印
字ヘッド用として出力するプリヒート用信号発生回路５
とを備えている。The embodiment of FIG. 1 includes a plurality of print heads 2°, 22 .
. . . A plurality of head drive circuits 31, 3□, . . . which output heating signals for printing in response to +2n.
37, a microprocessor 1 that outputs head drive signals for each of the head drive circuits 31 to 37 separately, and the print head 2. ~2o, and a preheating signal generating circuit 5 that outputs a preheating drive signal BP of a predetermined duty cycle corresponding to the output level of the temperature sensing means 4 for the print head.
It is equipped with

温度検出手段４は、サーミスタその他の感熱素子を主要
部として構成されている。The temperature detection means 4 is mainly composed of a thermistor or other heat-sensitive element.

プリヒート用信号発生回路５から出力されるパルス信号
ＢＰは、論理和回路６１，６□、６３゜・・・・・・、
６７を介して各ヘッド駆動回路３１．３ｚ、・・・・・
・、３，１へ送られる。The pulse signal BP output from the preheating signal generation circuit 5 is output from the OR circuits 61, 6□, 63°...
67 to each head drive circuit 31.3z,...
・, sent to 3,1.

マイクロプロセッサ１から出力される印字を行うための
ヘッド駆動信号ＨＤＳは、対応する論理回路６１〜６７
へ各別に送り込まれるようになっている。このマイクロ
プロセッサ１は、内部にリードオンメモリ　（ＲＯＭ）
、　　ランダムアクセスメモリ　（ＲＡＭ）及びアナロ
グ−デジタル変換回路等を内蔵している。前述した温度
検出手段４の出力は、このアナログ−デジタル変換回路
部の作用によってデジタル化されるようになっている。The head drive signal HDS for printing output from the microprocessor 1 is sent to the corresponding logic circuits 61 to 67.
They are sent to each separately. This microprocessor 1 has an internal read-on memory (ROM).
It has built-in random access memory (RAM), analog-to-digital conversion circuit, etc. The output of the temperature detection means 4 mentioned above is digitized by the action of this analog-to-digital conversion circuit section.

すなわち、温度検出手段４からの信号を入力したマイク
ロプロセッサ１は、温度に応じた印字しない程度のデユ
ーティサイクルのパルス信号を出力するようにプリヒー
ト用信号発生回路５を常時駆動制御する。That is, the microprocessor 1, which receives the signal from the temperature detection means 4, constantly controls the preheating signal generation circuit 5 so as to output a pulse signal with a duty cycle that does not print, depending on the temperature.

このプリヒート用信号発生回路５から出力されるパルス
信号ＢＰも前述したヘッド駆動信号ＤＨ３と同様に論理
和回路６Ｉ〜６゜へ送り込まれるようになっている。こ
のため、本実施例では論理和回路６１〜６４及び印字用
の各ヘッド駆動回路３、〜３、を介して印字ヘッド各２
．〜２、を予熱する構成となっている。The pulse signal BP output from the preheating signal generating circuit 5 is also sent to the OR circuits 6I-6° in the same way as the head drive signal DH3 described above. For this reason, in this embodiment, each print head is
．． ~2, it is configured to preheat.

論理和回路６１，６□、６３．・・・・・・、６．とし
て、本実施例ではＯＲ回路が使用されている。そして、
この論理和回路６．〜６、に入力されるヘッド駆動信号
ＨＤＳとヘッド予熱用のパルス信号ＢＰとの論理和が「
１」である間、対応する各ヘッド駆動回路３．〜３ｏは
、対応する各印字ヘッド２１〜２７に各々駆動電流ＤＣ
を通電せしめるように作動する。OR circuits 61, 6□, 63.・・・・・・、6. As such, an OR circuit is used in this embodiment. and,
This OR circuit 6. ~6, the logical sum of the head drive signal HDS and the head preheating pulse signal BP is "
1'', each corresponding head drive circuit 3. ~3o is a driving current DC for each corresponding print head 21~27.
It operates to energize.

従って、本実施例ではプリヒート用信号発生回路５の出
力信号ＢＰは、そのデユーティを最大値にしても印字を
しない程度に留められていることから、キャリッジ移動
中、印字をしない時点においては駆動電流ＤＣがプリヒ
ート用パルス信号ＢＰの成分のみとなって周囲温度に拘
わらず印字ヘッド２．〜２ｆｉの温度が一定に保たれる
ようになる。このため、このような状態でヘッド駆動信
号ＨＤＳが加えられたとすれば、そのとき、すなわちド
ツトを印字する時点における印字ヘッド２１〜２１の温
度上昇もまた一定となる。Therefore, in this embodiment, the output signal BP of the preheating signal generation circuit 5 is kept at a level that does not cause printing even if its duty is set to the maximum value. Since DC is only a component of the preheating pulse signal BP, the print head 2. ~2fi temperature will be kept constant. Therefore, if the head drive signal HDS is applied in such a state, the temperature rise of the print heads 21 to 21 at that time, that is, at the time when dots are printed, will also be constant.

〔発明の効果〕〔Effect of the invention〕

本発明は以上のように構成され機能するので、これによ
ると、周囲温度の上下に拘わらず印字の濃度を一定にす
ることができ、印字品質の良い印字装置を得ることがで
きる。Since the present invention is configured and functions as described above, it is possible to maintain the density of the print constant regardless of whether the ambient temperature is high or low, and it is possible to obtain a printing device with good print quality.

また、従来に比べ回路が筒素化されるので原価低減と信
顛性向上を図ることができる。Furthermore, since the circuit is made into a cylindrical element compared to the conventional one, it is possible to reduce the cost and improve the reliability.

【図面の簡単な説明】[Brief explanation of the drawing]

第１図は本発明の実施例を示すブロック図、第２図は従
来例を示すブロック図である。 １・・・・・・マイクロプロセッサ、２１．２□、・・
・・・・。 ２、・・・・・・印字ヘッド、３３，３□、・・・・・
・、３．、・・・・・・〜ラド駆動回路、４・・・・・
・温度検出手段、５・・・・・・プリヒート用信号発生
回路。 特許出願人　　日　本　電　気　株式会社第１図FIG. 1 is a block diagram showing an embodiment of the present invention, and FIG. 2 is a block diagram showing a conventional example. 1...Microprocessor, 21.2□,...
.... 2,...Print head, 33,3□,...
・,3. ,...~RAD drive circuit, 4...
- Temperature detection means, 5... preheat signal generation circuit. Patent applicant: Japan Electric Co., Ltd. Figure 1

Claims (1)

【特許請求の範囲】[Claims] （１）、複数の印字ヘッドに対応して印字用の加熱信号
を出力する複数のヘッド駆動回路と、この各駆動回路を
駆動制御するマイクロプロセッサとを備えた印字ヘッド
駆動制御装置において、前記印字ヘッドの近傍に、温度
検出手段を装備し、この温度検出手段の出力レベルに対
応した所定のデューティサイクルのプリヒート用信号電
流を前記印字ヘッド用として出力するプリヒート用信号
発生回路を設けたことを特徴とする印字ヘッド駆動制御
装置。(1) A print head drive control device comprising a plurality of head drive circuits that output heating signals for printing in correspondence with a plurality of print heads, and a microprocessor that drives and controls each of the drive circuits. The present invention is characterized in that a temperature detection means is provided near the head, and a preheat signal generation circuit is provided for outputting a preheat signal current for the print head with a predetermined duty cycle corresponding to the output level of the temperature detection means. Print head drive control device.
JP26149886A 1986-10-31 1986-10-31 Driving controller for printing head Pending JPS63114672A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP26149886A JPS63114672A (en) 1986-10-31 1986-10-31 Driving controller for printing head

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP26149886A JPS63114672A (en) 1986-10-31 1986-10-31 Driving controller for printing head

Publications (1)

Publication Number Publication Date
JPS63114672A true JPS63114672A (en) 1988-05-19

Family

ID=17362743

Family Applications (1)

Application Number Title Priority Date Filing Date
JP26149886A Pending JPS63114672A (en) 1986-10-31 1986-10-31 Driving controller for printing head

Country Status (1)

Country Link
JP (1) JPS63114672A (en)

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