JPS61227073A - Thermal printing head - Google Patents

Thermal printing head

Info

Publication number
JPS61227073A
JPS61227073A JP6875185A JP6875185A JPS61227073A JP S61227073 A JPS61227073 A JP S61227073A JP 6875185 A JP6875185 A JP 6875185A JP 6875185 A JP6875185 A JP 6875185A JP S61227073 A JPS61227073 A JP S61227073A
Authority
JP
Japan
Prior art keywords
data
latch register
driven
heating element
period
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
JP6875185A
Other languages
Japanese (ja)
Inventor
Kazuharu Itakura
和治 板倉
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 JP6875185A priority Critical patent/JPS61227073A/en
Publication of JPS61227073A publication Critical patent/JPS61227073A/en
Pending 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
    • B41J2/36Print density control

Abstract

PURPOSE:To improve printing quality of an isolated point or a single line which would otherwise be printed with low density, by logically processing the content of data to be subsequently printed by a thermal printing head. CONSTITUTION:A STR signal is turned ON for a period of time T1, and data for correcting a thermal hysteresis are inputted to a shift register (flip-flops 1-24). The correcting data are independent from the conditions of adjacent heating resistors on both sides. However, when the content of the shift register is transferred into a latch register (flip-flops 25-48) by a LA signal, data '1' are transferred to the latch register even when the relevant bit in the correcting data is '0', by a logical circuit composed of NAND gates 49-96, if the adjacent heating elements on both sides have not been driven in the preceding period of time T1 while the heating element for the relevant bit has been driven in the period T1. Next, the STR signal is turned ON for a period of time T2, and heating element is driven in accordance with the bits corresponding to '1' data in the latch register.

Description

【発明の詳細な説明】 (産業上の利用分野) 本発明は情報処理装置で用いられる印字装置に関し、特
に熱転写プリンタの印字ヘッド駆動回路の構成に関する
DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a printing device used in an information processing device, and particularly to the configuration of a print head drive circuit of a thermal transfer printer.

(従来の技術) 熱転写方式のプリンタで従来使用されていた印字ヘッド
の回路の一例を第3図に示す。第3図において201は
24ビツトのシフトレジスタ、202IIi24ビツト
のラッチレジスタ、203〜226はドライバ回路の役
目を果たすナントゲート、227〜250は発熱体であ
る。次に第4図を用いて第3図に示された従来の印字ヘ
ッドの回路動作を簡単【説明する。図中の符号1〜24
のクロックパルス(CP ’)によりシフトレジスタ九
入力され九24ビットの印字データは、ラッチパルス(
LA)1によりラッチレジスタに一斉にコピーされる。
(Prior Art) FIG. 3 shows an example of a print head circuit conventionally used in a thermal transfer printer. In FIG. 3, 201 is a 24-bit shift register, 202IIi is a 24-bit latch register, 203 to 226 are Nant gates serving as driver circuits, and 227 to 250 are heating elements. Next, the circuit operation of the conventional print head shown in FIG. 3 will be briefly explained using FIG. 4. Codes 1 to 24 in the diagram
The 924-bit print data input to the shift register by the clock pulse (CP') is input by the latch pulse (CP').
LA)1, they are copied all at once to the latch register.

その後、ストローブ信号(STR)がナントゲートに入
力されることによって該STRがオンの時間だけ′1”
データに対応した発熱体に電流が流れる。
After that, by inputting the strobe signal (STR) to the Nant gate, it is '1'' for the time that the STR is on.
Current flows through the heating element corresponding to the data.

(発明が解決しようとする問題点) 熱転写方式の印字ヘッドでは、ドライブパルスを与えら
れた時の印字ヘッド上の各発熱体の温度差が印字品質に
大きな影f#を与える。この問題には2つの原因がある
。第1の原因は、1つの発熱体に着目した時その発熱体
が直前にドライブされていれば、その発熱体は直前にド
ライブされていない他の発熱体よりも高い温度に達する
事による。
(Problems to be Solved by the Invention) In a thermal transfer print head, the temperature difference between each heating element on the print head when a drive pulse is applied has a large effect f# on print quality. There are two causes for this problem. The first reason is that when focusing on one heating element, if that heating element has been driven immediately before, that heating element will reach a higher temperature than other heating elements that have not been driven immediately before.

第2の原因は、その発熱体の両隣の発熱体が同時にドラ
イブされる場合と、その発熱体のみがドライブされる場
合では前者の方が後者の場合よりも高い温度に達する事
による。
The second reason is that when the heating elements on both sides of the heating element are driven simultaneously and when only the heating element is driven, the former reaches a higher temperature than the latter.

第1の原因については、従来、直前のドライブ状況によ
り前記STRのパルス巾を各発熱体毎に変える事で制御
してきた。第3図の回路例では各発熱体毎にSTRのパ
ルス巾を変えることはできないので、正規のSTRパル
スを与えているあいだに補正用のデータを送り込み、正
規のSTRパルスに続いて補正用のSTRパルスを与え
る事で実質的に各発熱体毎にドライブ時間を変えてこの
問題を解決している。
Conventionally, the first cause has been controlled by changing the pulse width of the STR for each heating element depending on the previous driving situation. In the circuit example shown in Figure 3, it is not possible to change the STR pulse width for each heating element, so correction data is sent while the regular STR pulse is being applied, and the correction data is sent following the regular STR pulse. By applying STR pulses, this problem is solved by substantially changing the drive time for each heating element.

しかし、上述の第2の原因については、従来の回路では
解決することができない。この為、孤立点の印字や、1
本線の印字ではどうしても印字が薄くなり印字品質に悪
い影響を与えていた。
However, the second cause mentioned above cannot be solved by conventional circuits. For this reason, printing of isolated points,
When printing on main lines, the print inevitably becomes thinner, which has a negative effect on print quality.

(問題点を解決するための手段) 本発明のサーマルヘッド回路では両隣の発熱体のドライ
ブデータを保持するラッチレジスタの内容の論理否定と
自分自身のラッチレジスタの内容のAND回路を有し、
そのAND条件が真であれば、ラッチレジスタへの入力
データ自体が′1”でなくとも1”を入力する機能を有
している。
(Means for Solving the Problems) The thermal head circuit of the present invention has an AND circuit of the logical negation of the contents of the latch registers holding the drive data of the heating elements on both sides and the contents of its own latch register,
If the AND condition is true, the latch register has the function of inputting 1'' even if the input data itself is not ``1''.

このように本発明のサーマルプリン“トヘッドは、ドラ
イブデータを保持しているラッチレジスタの内容と次に
印字しようとするデータの内容を論理演算する論理回路
を有して構成したものである。
As described above, the thermal print head of the present invention is constructed with a logic circuit that performs a logical operation on the contents of the latch register holding the drive data and the contents of the data to be printed next.

(実施例) 次に、本発明について図面を参照して説明する。(Example) Next, the present invention will be explained with reference to the drawings.

第1図は本発明の一実施例の回路図である。プリンプロ
ップ1〜フリツプロツブ24は、シフトレジスタを構成
している。フリップコツプ25〜フリツプロツプ48は
、ラッチレジスタを構成している。ナントゲート49〜
ナントゲート96は、ラッチレジスタにデータを入力す
るときシフトレジスタからのデータだけでなくラッチレ
ジスタの当該ビットの両隣をも参照する為の論理回路を
構成している。ナントゲート97〜ナントゲート120
は、発熱体である抵抗121〜抵抗144に電流を流す
為のドライバである。図中CLRは″′0″レベルでク
リアすることを表わす。
FIG. 1 is a circuit diagram of an embodiment of the present invention. The flipflop 1 to the flipflop 24 constitute a shift register. Flipflops 25 to 48 constitute a latch register. Nantes Gate 49~
The Nant gate 96 constitutes a logic circuit for referring not only to the data from the shift register but also to both sides of the relevant bit in the latch register when inputting data to the latch register. Nantes Gate 97 to Nantes Gate 120
is a driver for passing current through the resistors 121 to 144, which are heating elements. In the figure, CLR indicates clearing at the ``0'' level.

第2図のタイムチャートを用いて第1図に示された実施
例の動作を説明する。すべての動作に先立ってラッチレ
ジスタ(フリップロッジ25〜フリツプロツプ48)t
iクリア(CLR)信号によってクリアされているもの
とする。次に24発のクロックパルス(CP)信号によ
り入力データ(DI)信号から入力された印字データは
シフトレジスタ(フリップロッジ1〜フリツプロツプ2
4)に格納される。シフトレジスタ内のデータは、次に
、ラッチパルス(LA)信号によりラッチレジスタVC
24ピット同時に移される。次にSTR信号がT1の時
間オンとなり、ラッチレジスタ内の1”データに対応す
るビットだけ発熱体がドライブされる。このTlの時間
にシフトレジスタには熱履歴の補正用のデータが入力さ
れる。
The operation of the embodiment shown in FIG. 1 will be explained using the time chart of FIG. 2. Prior to every operation, the latch register (flip lodge 25 to flip flop 48) is
It is assumed that it has been cleared by the i clear (CLR) signal. Next, the print data inputted from the input data (DI) signal by 24 clock pulse (CP) signals is transferred to a shift register (flip lodge 1 to flip flop 2).
4). The data in the shift register is then transferred to the latch register VC by the latch pulse (LA) signal.
24 pits will be moved at the same time. Next, the STR signal is turned on for a time T1, and the heating element is driven by the bit corresponding to the 1" data in the latch register. During this time T1, data for correcting the thermal history is input to the shift register. .

補正用のデータはプリンタを制御するマイクロプロセッ
サ等で計算されたもので各ビットのひとつ的のT1の時
間において発熱体がドライブされていれば* 0 *と
し、ドライブされていなければ1′としたものである。
The correction data is calculated by the microprocessor that controls the printer, and if the heating element is being driven at the time T1 of each bit, it is set as *0*, and if it is not, it is set as 1'. It is something.

すなわちこの補正は各発熱体の自身の履歴のみに着目し
ておこなわれており1両隣の発熱体の状況とは独立であ
る。しかし、次VcLA信号によってシフトレジスタの
内容がラッチレジスタに移される時に、ナントゲート4
9〜ナントゲート96で構成された論理回路の働き罠よ
り、両隣の発熱体が直前の11時間でおいてドライブさ
れておらず、かつ当該ビットの発熱体が直前の11時間
においてドライブされているという条件が満足されるな
ら、たとえ上記補正データの当該ビットが01であって
も1“データがラッチレジスタに移送される。次Vcs
TR信号がT2の時間オンになり、ラッチレジスタ内の
″11データに対応するビットだけ発熱体がドライブさ
れる。
That is, this correction is performed by focusing only on the history of each heating element itself, and is independent of the status of the heating elements on both sides. However, when the contents of the shift register are transferred to the latch register by the next VcLA signal, the Nant gate 4
9 - Due to the working trap of the logic circuit composed of Nant gates 96, the heating elements on both sides have not been driven in the previous 11 hours, and the heating element of the relevant bit has been driven in the previous 11 hours. If this condition is satisfied, 1" data is transferred to the latch register even if the corresponding bit of the correction data is 01. Next Vcs
The TR signal is turned on for a time T2, and the heating element is driven by the bit corresponding to the "11" data in the latch register.

(発明の効果) 以上説明したように本発明は、シフトレジスタとラッチ
レジスタの間にシフトレジスタの出力だけでなくラッチ
レジスタ上の当該ビットのビットデータとその両隣のラ
ッチレジスタ上のビットデータを入力とする論理回路を
有すること(よシ。
(Effects of the Invention) As explained above, the present invention allows inputting not only the output of the shift register, but also the bit data of the relevant bit on the latch register and the bit data of the latch registers on both sides thereof, between the shift register and the latch register. have a logic circuit that

ラッチレジスタ上の当該ビットのビットデータが1”で
かつ両隣のビットデータが共に0”であればシフトレジ
スタからの出力が0#であっても1#がラッチされるよ
うにした。これによシ、熱履歴の補正データをラッチレ
ジスタ九入力する時に同時に両隣のドライブ状況による
補正をもおこなえる。その結果、従来発熱体の到達温度
が足りず、薄い印字になりがちだった孤立点や一本線の
印字品質を著しく改善する効果がある。
If the bit data of the relevant bit on the latch register is 1'' and both adjacent bit data are 0'', 1# is latched even if the output from the shift register is 0#. With this, when the thermal history correction data is inputted into the latch register 9, correction can also be made based on the drive conditions on both sides at the same time. As a result, the printing quality of isolated points and single lines, which conventionally tended to be thin due to the insufficient temperature reached by the heating element, can be significantly improved.

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

第1図は本発明の一実施例の回路図、第2図は第1図の
回路の動作をせつめいする為のタイムチャートを示した
図、第3図は従来のサーマルヘッドで用いられている回
路の一例を示す回路図、第4図は第3図の回路の動作を
説明する為のタイムチャートを示した図である。 1〜24・・・シフトレジスタf:構成するフリップフ
ロップ、 25〜48・・・ラッチレジスタを構成するフリップフ
ロップ。 49〜96・・・ナントゲート、 97〜120・・・ドライバとなるナントゲート、12
1〜144・・・抵抗。
Fig. 1 is a circuit diagram of an embodiment of the present invention, Fig. 2 is a diagram showing a time chart for determining the operation of the circuit of Fig. 1, and Fig. 3 is a diagram showing a circuit diagram of an embodiment of the present invention. FIG. 4 is a circuit diagram showing an example of the circuit shown in FIG. 3, and FIG. 4 is a diagram showing a time chart for explaining the operation of the circuit shown in FIG. 1-24... Shift register f: Flip-flop forming the structure, 25-48... Flip-flop forming the latch register. 49-96... Nantes Gate, 97-120... Nantes Gate as a driver, 12
1-144...Resistance.

Claims (1)

【特許請求の範囲】[Claims] ドライブデータを保持しているラッチレジスタの内容と
次に印字しようとするデータの内容を論理演算する論理
回路を有することを特徴とするサーマルプリントヘッド
A thermal print head characterized by having a logic circuit that performs a logical operation on the contents of a latch register holding drive data and the contents of data to be printed next.
JP6875185A 1985-04-01 1985-04-01 Thermal printing head Pending JPS61227073A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6875185A JPS61227073A (en) 1985-04-01 1985-04-01 Thermal printing head

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6875185A JPS61227073A (en) 1985-04-01 1985-04-01 Thermal printing head

Publications (1)

Publication Number Publication Date
JPS61227073A true JPS61227073A (en) 1986-10-09

Family

ID=13382782

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6875185A Pending JPS61227073A (en) 1985-04-01 1985-04-01 Thermal printing head

Country Status (1)

Country Link
JP (1) JPS61227073A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63202474A (en) * 1987-02-18 1988-08-22 Matsushita Electric Ind Co Ltd Thermal recording printer
JPS63230366A (en) * 1987-03-18 1988-09-26 Nippon Denki Sanei Kk Dot type thermal recording apparatus
EP0750996A2 (en) * 1991-10-03 1997-01-02 Mitsubishi Denki Kabushiki Kaisha Recording head driving device

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63202474A (en) * 1987-02-18 1988-08-22 Matsushita Electric Ind Co Ltd Thermal recording printer
JPS63230366A (en) * 1987-03-18 1988-09-26 Nippon Denki Sanei Kk Dot type thermal recording apparatus
EP0750996A2 (en) * 1991-10-03 1997-01-02 Mitsubishi Denki Kabushiki Kaisha Recording head driving device
EP0750996A3 (en) * 1991-10-03 1997-03-12 Mitsubishi Electric Corp Recording head driving device

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