JPS6351104B2 - - Google Patents

Info

Publication number
JPS6351104B2
JPS6351104B2 JP56038713A JP3871381A JPS6351104B2 JP S6351104 B2 JPS6351104 B2 JP S6351104B2 JP 56038713 A JP56038713 A JP 56038713A JP 3871381 A JP3871381 A JP 3871381A JP S6351104 B2 JPS6351104 B2 JP S6351104B2
Authority
JP
Japan
Prior art keywords
voltage
pulse
thermal recording
drive circuit
heat generating
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
Application number
JP56038713A
Other languages
Japanese (ja)
Other versions
JPS57152970A (en
Inventor
Haruhiko Moriguchi
Toshiji Inui
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.)
Fujifilm Business Innovation Corp
Original Assignee
Fuji Xerox Co Ltd
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 Fuji Xerox Co Ltd filed Critical Fuji Xerox Co Ltd
Priority to JP3871381A priority Critical patent/JPS57152970A/en
Publication of JPS57152970A publication Critical patent/JPS57152970A/en
Publication of JPS6351104B2 publication Critical patent/JPS6351104B2/ja
Granted legal-status Critical Current

Links

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41JTYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/315Typewriters 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
    • B41J2/32Typewriters 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
    • B41J2/35Typewriters 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
    • B41J2/355Control circuits for heating-element selection

Landscapes

  • Accessory Devices And Overall Control Thereof (AREA)
  • Electronic Switches (AREA)

Description

【発明の詳細な説明】 本発明は感熱記録ヘツドによる記録画像の不均
一を是正した感熱記録装置に関する。
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a thermal recording apparatus that corrects non-uniformity of images recorded by a thermal recording head.

感熱記録ヘツドを使用した感熱記録装置では感
熱記録ヘツド上の多数の発熱抵抗体を画信号に応
じて選択的に駆動させるための駆動回路を備えて
いる。
A thermal recording apparatus using a thermal recording head is equipped with a drive circuit for selectively driving a large number of heating resistors on the thermal recording head in accordance with image signals.

第1図は駆動回路の一例を示したもので、説明
を簡単にするために感熱記録ヘツド1上に配置さ
れた発熱抵抗体の数を実際よりもかなり少なく表
わしている。この駆動回路の電圧供給端子Vps
は図示しない定電圧電源から個々の発熱体を発熱
させるための電圧が印加されており、2個のソー
スドライバ信号端子S1,S2には2個の共通端子ス
イツチ素子Q1,Q2を交互に導通状態におくため
のパルス信号が供給されている。また5個のシン
クドライバ信号端子D1〜D5には感熱記録ヘツド
上に配置された各発熱抵抗体R1〜R10に対応する
画素についての画信号が供給されている。各シン
クドライバ信号端子D1〜D5はそれぞれデータ端
子スイツチ素子Q3〜Q7の対応する制御端子(ト
ランジスタのベース)に接続されている。従つて
ソースドライド信号端子S1にパルス信号が供給さ
れ共通端子スイツチ素子Q1が導通している状態
では、データ端子スイツチ素子Q3〜Q7のうちシ
ンクドライバ信号端子D1〜D5の印字すべき画信
号が供給されている端子に対応する素子が導通す
る。そして共通端子スイツチ素子Q1に一端を接
続された5個の発熱抵抗体R1〜R5のうち導通し
たデータ端子スイツチ素子に他端を接続された発
熱抵抗体が通電し発熱する。他のソースドライバ
信号端子S2にパルス信号が供給されている間は、
同様にして他の5個の発熱抵抗体R6〜R10のうち
画信号に応じた発熱抵抗体が通電し発熱する。
FIG. 1 shows an example of a drive circuit, and in order to simplify the explanation, the number of heating resistors arranged on the thermal recording head 1 is shown to be much smaller than the actual number. A voltage for causing each heating element to generate heat is applied from a constant voltage power source (not shown) to the voltage supply terminal V ps of this drive circuit, and two source driver signal terminals S 1 and S 2 are connected to two source driver signal terminals S 1 and S 2 . A pulse signal is supplied to alternately turn on the common terminal switch elements Q 1 and Q 2 . Furthermore, the five sync driver signal terminals D 1 to D 5 are supplied with image signals for pixels corresponding to the heating resistors R 1 to R 10 arranged on the thermal recording head. Each sink driver signal terminal D1 to D5 is connected to a corresponding control terminal (base of a transistor) of a data terminal switch element Q3 to Q7 , respectively. Therefore, when a pulse signal is supplied to the source drive signal terminal S 1 and the common terminal switch element Q 1 is conductive, the sink driver signal terminals D 1 to D 5 of the data terminal switch elements Q 3 to Q 7 are printed. The element corresponding to the terminal to which the desired image signal is supplied becomes conductive. Then, among the five heat generating resistors R 1 to R 5 whose one end is connected to the common terminal switch element Q 1 , the heat generating resistor whose other end is connected to the conductive data terminal switch element is energized and generates heat. While the pulse signal is supplied to the other source driver signal terminal S2 ,
Similarly, among the other five heat generating resistors R6 to R10 , the heat generating resistor corresponding to the image signal is energized and generates heat.

このような駆動回路では同時に発熱する発熱抵
抗体の数に比例して共通端子スイツチ素子Q1
Q2を流れる電流が変化する。従つてこれに応じ
てこれらの共通端子スイツチ素子Q1,Q2や線路
のインピーダンス分による電圧降下の度合が変化
し発熱抵抗体R1〜R10の発熱量が変化する。以上
の理由から同時に通電を行う発熱抵抗体の数が異
なると記録濃度や印字されるドツトの大きさ等の
記録特性が異なり、記録画像の不均一が発生す
る。
In such a drive circuit, the common terminal switch element Q 1 ,
The current flowing through Q 2 changes. Accordingly, the degree of voltage drop due to the impedance of these common terminal switch elements Q 1 and Q 2 and the line changes accordingly, and the amount of heat generated by the heating resistors R 1 to R 10 changes. For the above reasons, if the number of heating resistors that are energized at the same time differs, the recording characteristics such as recording density and the size of printed dots will differ, resulting in non-uniformity of the recorded image.

本発明は上記した事情に鑑みてなされたもの
で、記録画像の不均一を是正することのできる感
熱記録装置を提供することを目的とする。
The present invention has been made in view of the above-mentioned circumstances, and an object of the present invention is to provide a thermal recording device that can correct non-uniformity of recorded images.

本発明では発熱抵抗体に印加される電圧を検出
しこれに応じて発熱抵抗体に印加されるパルスの
幅を変化させることとして前記した目的を達成す
る。
The present invention achieves the above object by detecting the voltage applied to the heating resistor and changing the width of the pulse applied to the heating resistor accordingly.

以下実施例につき本発明を詳細に説明する。 The present invention will be explained in detail with reference to Examples below.

第2図は感熱記録装置の電気回路を示したもの
である。この装置で印加パルス発生器2内の2個
の共通端子スイツチ素子(第1図のQ1,Q2)か
ら交互に出力されるパルス電圧3,4は、感熱記
録ヘツド1の発熱抵抗体におけるグループ単位の
共通端子に供給される。記録データ5は信号端子
制御器(第1図のQ3〜Q7)6に供給され、ここ
から出力され信号は前記共通端子に一端を接続し
た発熱抵抗体の他端にそれぞれ供給される。
FIG. 2 shows the electric circuit of the thermosensitive recording device. In this device, pulse voltages 3 and 4 alternately output from two common terminal switch elements (Q 1 and Q 2 in FIG. 1) in the applied pulse generator 2 are applied to the heating resistor of the thermal recording head 1. Supplied to the common terminal of each group. The recorded data 5 is supplied to a signal terminal controller (Q 3 to Q 7 in FIG. 1) 6, and the signals outputted from there are respectively supplied to the other ends of heating resistors whose one ends are connected to the common terminal.

印加パルス発生器2から出力されるパルス電圧
3,4はそれぞれ電圧制御発振器7にも供給され
ている。電圧制御発振器7はそれぞれのパルス電
圧を立ち上り時点でサンプリングしこれをホール
ドしてその電圧値に基づいて発振周波数を変化さ
せる。分周器8はこの発振周波数を適当に分周し
て所定のパルス幅のパルス信号を作成する。定電
圧電源9は印加パルス発生器2に供給され、前記
したパルス信号と同一のパルス幅のパルス電圧を
発生させる。
Pulse voltages 3 and 4 outputted from the applied pulse generator 2 are also supplied to a voltage controlled oscillator 7, respectively. The voltage controlled oscillator 7 samples each pulse voltage at the rising point, holds it, and changes the oscillation frequency based on the voltage value. The frequency divider 8 divides this oscillation frequency appropriately to create a pulse signal with a predetermined pulse width. A constant voltage power supply 9 is supplied to the application pulse generator 2, and generates a pulse voltage having the same pulse width as the pulse signal described above.

第3図はこの感熱記録装置における発熱抵抗体
に印加される電圧の低下△Vとパルス幅τの関係
を表わしたものである。感熱記録ヘツド1の発熱
抵抗体がわずかの本数しか通電状態とならない場
合には、定電圧電源9から出力される例えば15V
の電圧はほとんど降下せずに発熱抵抗体に印加さ
れる。このときほぼ15Vの電圧が印加された電圧
制御発振器は20KHzで発振する。分周器8はこれ
を一定の分周比で分周し、0.5msecのパルス幅を
もつパルス信号を作成する。従つてこの場合には
発熱抵抗体は15Vの電圧で0.5msec通電され発熱
する。
FIG. 3 shows the relationship between the voltage drop ΔV applied to the heating resistor and the pulse width τ in this thermosensitive recording device. When only a small number of heating resistors of the thermal recording head 1 are energized, the constant voltage power supply 9 outputs, for example, 15V.
The voltage is applied to the heating resistor with almost no drop. At this time, the voltage controlled oscillator to which a voltage of approximately 15V is applied oscillates at 20KHz. The frequency divider 8 divides this signal at a constant frequency division ratio to create a pulse signal having a pulse width of 0.5 msec. Therefore, in this case, the heating resistor is energized with a voltage of 15V for 0.5msec and generates heat.

これに対して、黒の罫線を印字する場合のよう
に一列に配列された1グループの発熱抵抗体が総
て同時に通電状態となる場合には、定電圧電源9
から出力される15Vの電圧は例えば4Vほど降下
して各発熱抵抗体に印加される。このとき差し引
き11Vの電圧が印加された電圧制御発振器7は
10KHzで発振を行う。分周器8はこれを一定の分
周比で分周し、10msecのパルス幅をもつパルス
信号を作成する。従つてこの場合発熱抵抗体は
11Vの電圧で1.0msec通電され、記録濃度の均一
さが同様に維持される。
On the other hand, when a group of heating resistors arranged in a line are all energized at the same time, such as when printing black ruled lines, the constant voltage power supply 9
The 15V voltage output from the 15V voltage drops by, for example, 4V and is applied to each heating resistor. At this time, the voltage controlled oscillator 7 to which a voltage of 11V is applied is
Oscillates at 10KHz. The frequency divider 8 divides this signal at a constant frequency division ratio to create a pulse signal having a pulse width of 10 msec. Therefore, in this case, the heating resistor is
A voltage of 11V is applied for 1.0msec, and the uniformity of the recording density is similarly maintained.

このように本発明によれば感熱記録ヘツド1の
発熱抵抗体に印加される電圧の降下分に応じて印
加パルスのパルス幅を変動させたので、同時に通
電される発熱抵抗体の数に依らず個々の発熱抵抗
体の記録濃度を均一に保つことができる。また本
発明では感熱記録ヘツドに印加するパルスの幅を
変化させることとしたので、感熱記録ヘツドの基
板の温度や外気の温度に応じてその変化幅を補償
するようにすればあらゆる環境の下で記録紙の記
録濃度を均一にすることが可能となる。
In this manner, according to the present invention, the pulse width of the applied pulse is varied in accordance with the drop in voltage applied to the heating resistors of the thermal recording head 1, so that the pulse width of the applied pulse is varied regardless of the number of heating resistors that are energized at the same time. The recording density of each heating resistor can be kept uniform. In addition, in the present invention, since the width of the pulse applied to the thermal recording head is changed, if the width of the change is compensated according to the temperature of the substrate of the thermal recording head and the temperature of the outside air, it can be used under any environment. It becomes possible to make the recording density of the recording paper uniform.

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

第1図は感熱記録ヘツドの駆動回路の概略を示
す回路図、第2図は本発明の一実施例における感
熱記録装置の要部を示すブロツク図、第3図は縦
軸にパルス幅τと電圧降下△Vを、また横軸に電
圧制御発振器の発振周波数をとつた前記実施例の
装置の特性図である。 1……感熱記録ヘツド、2……印加パルス発生
器、6……信号端子制御器、7……電圧制御発振
器。
FIG. 1 is a circuit diagram showing an outline of a drive circuit for a thermal recording head, FIG. 2 is a block diagram showing the main parts of a thermal recording device in an embodiment of the present invention, and FIG. 3 shows a pulse width τ plotted on the vertical axis. FIG. 3 is a characteristic diagram of the device of the above embodiment in which the voltage drop ΔV is plotted and the oscillation frequency of the voltage controlled oscillator is plotted on the horizontal axis. DESCRIPTION OF SYMBOLS 1...Thermal recording head, 2...Applying pulse generator, 6...Signal terminal controller, 7...Voltage controlled oscillator.

Claims (1)

【特許請求の範囲】[Claims] 1 多数の発熱抵抗体を備えた感熱記録ヘツド
と、画信号に応じて同一タイミングで前記発熱抵
抗体を選択的に通電させる駆動回路と、この駆動
回路から前記発熱抵抗体に印加される電圧の降下
分を検出する検出手段と、この検出手段により検
出された電圧の降下分に応じて前記駆動回路に入
力される発熱抵抗体駆動のためのパルス信号のパ
ルス幅を増加させるパルス幅設定手段とを具備す
ることを特徴とする感熱記録装置。
1 A thermal recording head equipped with a large number of heat generating resistors, a drive circuit that selectively energizes the heat generating resistors at the same timing according to an image signal, and a voltage applied to the heat generating resistors from this drive circuit. a detection means for detecting the voltage drop; and a pulse width setting means for increasing the pulse width of the pulse signal for driving the heating resistor input to the drive circuit in accordance with the voltage drop detected by the detection means. A thermal recording device comprising:
JP3871381A 1981-03-19 1981-03-19 Heat-sensitive recorder Granted JPS57152970A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3871381A JPS57152970A (en) 1981-03-19 1981-03-19 Heat-sensitive recorder

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3871381A JPS57152970A (en) 1981-03-19 1981-03-19 Heat-sensitive recorder

Publications (2)

Publication Number Publication Date
JPS57152970A JPS57152970A (en) 1982-09-21
JPS6351104B2 true JPS6351104B2 (en) 1988-10-12

Family

ID=12532957

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3871381A Granted JPS57152970A (en) 1981-03-19 1981-03-19 Heat-sensitive recorder

Country Status (1)

Country Link
JP (1) JPS57152970A (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS608048U (en) * 1983-06-28 1985-01-21 ソニー株式会社 thermal printing device
JPH0647297B2 (en) * 1986-09-19 1994-06-22 日本ビクター株式会社 Thermal transfer gradation control device
JPS63114671A (en) * 1986-10-31 1988-05-19 Kubota Ltd Thermal head driver

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS52109945A (en) * 1975-11-06 1977-09-14 Seiko Epson Corp Voltage compensation control system for thermal printer

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS52109945A (en) * 1975-11-06 1977-09-14 Seiko Epson Corp Voltage compensation control system for thermal printer

Also Published As

Publication number Publication date
JPS57152970A (en) 1982-09-21

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