JPS61139448A - Drive circuit of ink jet head - Google Patents

Drive circuit of ink jet head

Info

Publication number
JPS61139448A
JPS61139448A JP26236184A JP26236184A JPS61139448A JP S61139448 A JPS61139448 A JP S61139448A JP 26236184 A JP26236184 A JP 26236184A JP 26236184 A JP26236184 A JP 26236184A JP S61139448 A JPS61139448 A JP S61139448A
Authority
JP
Japan
Prior art keywords
piezoelectric element
piezoelectric transformer
piezoelectric
pulse
voltage
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
JP26236184A
Other languages
Japanese (ja)
Inventor
Tsuneo Mizuno
恒雄 水野
Noboru Takada
昇 高田
Tomoaki Takeshima
武島　智昭
Mitsuo Ozaki
光男 尾崎
Kohei Kiyota
航平 清田
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.)
Fujitsu Ltd
Original Assignee
Fujitsu 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 Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP26236184A priority Critical patent/JPS61139448A/en
Publication of JPS61139448A publication Critical patent/JPS61139448A/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
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet
    • B41J2/015—Ink jet characterised by the jet generation process
    • B41J2/04—Ink jet characterised by the jet generation process generating single droplets or particles on demand
    • B41J2/045—Ink jet characterised by the jet generation process generating single droplets or particles on demand by pressure, e.g. electromechanical transducers
    • B41J2/04501—Control methods or devices therefor, e.g. driver circuits, control circuits
    • B41J2/04541—Specific driving circuit
    • 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
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet
    • B41J2/015—Ink jet characterised by the jet generation process
    • B41J2/04—Ink jet characterised by the jet generation process generating single droplets or particles on demand
    • B41J2/045—Ink jet characterised by the jet generation process generating single droplets or particles on demand by pressure, e.g. electromechanical transducers
    • B41J2/04501—Control methods or devices therefor, e.g. driver circuits, control circuits
    • B41J2/04581—Control methods or devices therefor, e.g. driver circuits, control circuits controlling heads based on piezoelectric elements

Abstract

PURPOSE:To drive an ink jet head by distoration of piezoelectric element, by a method wherein the effect of boosting is maximized by applying the pulse of one half the resonance frequency of piezoelectric transformer to the piezoelectric transformer and said pulse of high voltage is applied to the piezoelectric element. CONSTITUTION:The titled drive circuit is composed of the piezoelectric transformer 8 boosting the input pulse signal from an input terminal 7, a resistance 9 and a piezoelectric element 3. Among them, the resistance 9 regulates the output pulse voltage of piezoelectric transformer 8 and the piezoelectric element 3 carries out the jet and supply of the ink of ink jet head. For example, if the rezonance frequency of piezoelectric transformer 8 is taken as 22kHz, the application of the pulse of 22-25mus, about one half the frequency thereof, to the piezoelectric transformer 8, the output voltage multiplies about 100 times. The piezoelectric element 3 is distorted by this high tension of applied voltage, ink 4 being jetted and information is recorded on a recording paper 6. Because this circuit does not require a high voltage power source and a switching circuit, its cost is reduced.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、印刷装置に用いられるインクジェ・ノドヘッ
ドの駆動回路に関し、特にインクジェットヘッドを駆動
する圧電素子を印加する高圧電源を改良したインクジェ
ットヘッドの駆動回路に関する。Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a drive circuit for an inkjet nozzle head used in a printing device, and in particular to an inkjet head drive circuit that improves the high-voltage power supply that applies a piezoelectric element that drives the inkjet head. Regarding drive circuits.

〔従来の技術〕[Conventional technology]

第３図は従来のインクジェットヘッドの駆動回路のブロ
ック図、第４図はインクジェットヘッドの動作を説明す
るための模式図である。FIG. 3 is a block diagram of a conventional inkjet head drive circuit, and FIG. 4 is a schematic diagram for explaining the operation of the inkjet head.

第３図のブロック図に示すように、従来のインクジェッ
トヘッドの駆動回路は、高圧電源１で発生した高圧直流
電圧をトランジスタのスイツチンレ゛回路２で外部より
入力される情報信号により所定の周期を持った高圧のパ
ルス電圧に変換し、インクジェットヘッドに設けられた
圧電素子３に印加している。As shown in the block diagram of FIG. 3, the conventional inkjet head drive circuit uses a high-voltage DC voltage generated by a high-voltage power supply 1 to have a predetermined cycle using an information signal input from the outside through a transistor switch circuit 2. The pulsed voltage is converted into a high-voltage pulse voltage and applied to a piezoelectric element 3 provided in the inkjet head.

第４図（ａｌの模式図に示すようにインクジエ・ノドヘ
ッド５は、薄いステンレス材等で形成された容器で、そ
の内部にインク４を充填し、インク４の噴射口５１と補
給口５２を有している。また、インクジェットヘッド５
の一辺に圧電素子３が固定されている。As shown in the schematic diagram in FIG. 4 (al), the inkjet head 5 is a container made of a thin stainless steel material, etc., and has an ink 4 injection port 51 and a replenishment port 52. Also, inkjet head 5
A piezoelectric element 3 is fixed to one side.

いま、圧電素子３にパルス電圧が印加されると第４図（
ｂｌに示すように、圧電素子３が内部方向に撓み、その
撓み動作によって容器内のインク４が圧迫され噴射口５
１を通つて外部に噴射されて記録紙６に情報が記録され
る。一方、情報信号が断となって圧電素子の印加電圧が
ＯＦＦとなる説、圧電素子３は第４図（ａ）の状態に復
帰し、外部のインクタンクより補給口５２を通って容器
内にインク４が補給される。このように圧電素子３への
印加パルスのＯＮ、　ＯＦＦによってインク４の噴射と
補給とを行い情報の記録を行っている。Now, when a pulse voltage is applied to the piezoelectric element 3, as shown in Fig. 4 (
As shown in bl, the piezoelectric element 3 bends inward, and the bending action compresses the ink 4 in the container, causing the injection port 5 to be compressed.
The information is ejected to the outside through the recording paper 6 and recorded on the recording paper 6. On the other hand, there is a theory that the information signal is cut off and the voltage applied to the piezoelectric element is turned off, and the piezoelectric element 3 returns to the state shown in FIG. Ink 4 is replenished. In this way, information is recorded by ejecting and replenishing the ink 4 by turning ON and OFF the applied pulses to the piezoelectric element 3.

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

上記インクジェットヘッドの駆動回路には、従来高圧電
源とトランジスタによるスイッチング回路を用いている
。それがためにコストが高くなるとともに、複雑な駆動
回路となり信頼性の向上を阻害している。Conventionally, the drive circuit for the inkjet head uses a switching circuit using a high-voltage power supply and a transistor. This increases the cost and makes the drive circuit complicated, which impedes improvement in reliability.

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

本発明は、上記問題点を解消したインクジェットヘッド
の駆動回路を提供するもので、その手段は、インクジェ
ットヘッドに設けられた圧電素子に印加する電圧発生回
路であって、該回路は圧電トランスからなり、該圧電ト
ランスの共振周波数の２分の１周期の印字情報パルスを
前記圧電トランスに入力し、該圧電トランスの出力を前
記前記圧電素子に印加することにより該圧電素子を撓ま
せて前記インクジェットヘッドを駆動するようにしたイ
ンクジェットヘッドの駆動回路によってなされる。The present invention provides an inkjet head drive circuit that solves the above problems, and its means include a voltage generation circuit that applies to a piezoelectric element provided in the inkjet head, the circuit comprising a piezoelectric transformer. , inputting a printing information pulse having a period of 1/2 of the resonant frequency of the piezoelectric transformer to the piezoelectric transformer, and applying the output of the piezoelectric transformer to the piezoelectric element to bend the piezoelectric element and thereby the inkjet head. This is done by an inkjet head drive circuit that drives the inkjet head.

〔作用〕[Effect]

上記インクジェットヘッドの駆動回路は、圧電素子の印
加電圧発生回路に圧電トランスを用い、その圧電トラン
スに圧電トランスが持っている共振周期の半分のパルス
を加え、圧電トランスの昇圧効果を最大とし、高電圧の
パルス電圧を得ている。これによって、従来の高圧電源
とトランジスタによるスイッチング回路に代わって低い
コストで、信頼性の高い実用的なものとなる。The drive circuit for the inkjet head described above uses a piezoelectric transformer in the applied voltage generation circuit of the piezoelectric element, applies a pulse of half the resonance period of the piezoelectric transformer to the piezoelectric transformer, maximizes the boosting effect of the piezoelectric transformer, and achieves high We are getting a pulsed voltage. This makes it a low-cost, highly reliable and practical alternative to conventional high-voltage power supplies and switching circuits using transistors.

〔実施例〕〔Example〕

以下、図面を参照して本発明の実施例を詳細に説明する
。Embodiments of the present invention will be described in detail below with reference to the drawings.

第１図は本発明の一実施例のインクジェットヘッドの駆
動回路の回路図である。すなわち、一実施例のインクジ
ェットヘッドの駆動回路は、入力端子７より入力された
入力パルス信号を昇圧する圧電トランス８と、圧電トラ
ンス８と圧電素子３の間に直列に接続され、圧電トラン
ス８の出力パルス電圧を調整する抵抗９と、インクジェ
ットヘッドのインクの噴出、補給を行わしめる圧電素子
３とより構成されている。FIG. 1 is a circuit diagram of an inkjet head drive circuit according to an embodiment of the present invention. That is, the inkjet head drive circuit of one embodiment includes a piezoelectric transformer 8 that boosts an input pulse signal inputted from an input terminal 7, and a piezoelectric transformer 8 that is connected in series between the piezoelectric element 3. It is composed of a resistor 9 that adjusts the output pulse voltage, and a piezoelectric element 3 that ejects and replenishes ink from the inkjet head.

その動作は、入力端子７を介して圧電トランス８に情報
信号となるパルスが加えられる。この印加パルスを圧電
トランスの共振周期の半分のパルスとすることによって
、圧電トランスの共振作用で最大の昇圧効果を得るよう
にしている。In this operation, a pulse serving as an information signal is applied to the piezoelectric transformer 8 via the input terminal 7. By making this applied pulse a pulse that is half the resonance period of the piezoelectric transformer, the maximum boosting effect can be obtained through the resonance action of the piezoelectric transformer.

例えば、圧電トランスを東北金属製のＮ−６材を使用し
、縦７６　ｔｍ　、横２１ｆｌ、厚さ５ｆｉのものを使
用すると、共振周波数が２２ＫＨｚとなる。そこで共振
周波数の約半分の周期である２２〜２５μｓのパルスを
圧電トランスに加え、ることにより、約１００倍の出力
電圧が得られる。この昇圧効果によって入力電圧が１〜
２■で１００〜２００ｖの出力電圧が得られ、圧電素子
の印加電圧となる。For example, if the piezoelectric transformer is made of N-6 material manufactured by Tohoku Metals and has a length of 76 tm, a width of 21 fl, and a thickness of 5 fi, the resonant frequency will be 22 KHz. Therefore, by applying a pulse of 22 to 25 μs, which is approximately half the period of the resonant frequency, to the piezoelectric transformer, an output voltage approximately 100 times greater can be obtained. Due to this boost effect, the input voltage can be increased from 1 to
2), an output voltage of 100 to 200V is obtained, which becomes the voltage applied to the piezoelectric element.

このように、本発明のインクジェットヘッドの駆動回路
は、圧電トランスの共振作用によって情報信号となる低
い電圧の入力パルスを高圧パルスとして出力し、圧電素
子に印加し、圧電素子の撓み動作によってインクジェッ
トヘッドよりインクを噴射して記録紙に情報の記録を行
う。As described above, the inkjet head drive circuit of the present invention outputs a low voltage input pulse that becomes an information signal as a high voltage pulse by the resonance effect of the piezoelectric transformer, applies it to the piezoelectric element, and drives the inkjet head by the bending action of the piezoelectric element. Information is recorded on recording paper by ejecting ink.

第２図は抵抗９を圧電素子３に並列に接続した駆動回路
であり、第１図と同じ動作を行う。FIG. 2 shows a drive circuit in which a resistor 9 is connected in parallel to the piezoelectric element 3, and performs the same operation as FIG. 1.

また、第１図、第２図の駆動回路とも抵抗９を可変抵抗
とすることでマルチノズルヘッドの駆動回路として、各
圧電素子の電圧調整を可能にすることができる。Furthermore, by making the resistor 9 a variable resistor in both of the drive circuits shown in FIGS. 1 and 2, it is possible to adjust the voltage of each piezoelectric element as a drive circuit for a multi-nozzle head.

〔発明の効果〕〔Effect of the invention〕

以上説明したように本発明によれば、高圧電源とスイッ
チング回路を必要としないので低コストとなり、かつ簡
単な回路となる為、高い信頼性が得られるといった効果
がある。As explained above, according to the present invention, since a high voltage power supply and a switching circuit are not required, the cost can be reduced, and since the circuit is simple, high reliability can be obtained.

【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インクシェフ）ヘッドの駆
動回路の回路図、第２図は一実施例のインクジェットへ
・７ドの駆動回路の他の回路図、第３図は従来のインク
ジェットヘッドの駆動回路のブロック図、第４図はイン
クジェットヘッドの動作を説明するための模式図である
。 図において、１は高圧電源、２はスイッチング回路、３
は圧電素子、４はインク、５はインクジェットヘッド、
５１は噴射口、５２は補給口、６は記録紙、７は入力端
子、８は圧電トランス、９は抵抗をそれぞれ示している
。 第１図 第２図 り 第３図 第４図 ５１　　　　　＆１Fig. 1 is a circuit diagram of a drive circuit for an ink chef head according to an embodiment of the present invention, Fig. 2 is another circuit diagram of an inkjet head drive circuit according to an embodiment, and Fig. 3 is a circuit diagram of a drive circuit for an inkjet head according to an embodiment of the present invention. FIG. 4 is a block diagram of the drive circuit of the inkjet head, and is a schematic diagram for explaining the operation of the inkjet head. In the figure, 1 is a high-voltage power supply, 2 is a switching circuit, and 3
is a piezoelectric element, 4 is ink, 5 is an inkjet head,
51 is an injection port, 52 is a supply port, 6 is a recording paper, 7 is an input terminal, 8 is a piezoelectric transformer, and 9 is a resistor. Figure 1 Figure 2 Figure 3 Figure 4 51 &1

Claims (1)

【特許請求の範囲】[Claims] インクジェットヘッドに設けられた圧電素子に印加する
電圧発生回路であって、該回路は圧電トランスからなり
、該圧電トランスの共振周波数の２分の１周期の印字情
報パルスを前記圧電トランスに入力し、該圧電トランス
の出力を前記前記圧電素子に印加することにより該圧電
素子を撓ませて前記インクジェットヘッドを駆動するよ
うにしたことを特徴とするインクジェットヘッドの駆動
回路。A voltage generating circuit for applying to a piezoelectric element provided in an inkjet head, the circuit comprising a piezoelectric transformer, inputting a print information pulse having a period of one half of the resonance frequency of the piezoelectric transformer to the piezoelectric transformer, An inkjet head drive circuit characterized in that the inkjet head is driven by applying an output of the piezoelectric transformer to the piezoelectric element to deflect the piezoelectric element.
JP26236184A 1984-12-11 1984-12-11 Drive circuit of ink jet head Pending JPS61139448A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP26236184A JPS61139448A (en) 1984-12-11 1984-12-11 Drive circuit of ink jet head

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP26236184A JPS61139448A (en) 1984-12-11 1984-12-11 Drive circuit of ink jet head

Publications (1)

Publication Number Publication Date
JPS61139448A true JPS61139448A (en) 1986-06-26

Family

ID=17374668

Family Applications (1)

Application Number Title Priority Date Filing Date
JP26236184A Pending JPS61139448A (en) 1984-12-11 1984-12-11 Drive circuit of ink jet head

Country Status (1)

Country Link
JP (1) JPS61139448A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7794063B2 (en) 2006-03-15 2010-09-14 Brother Kogyo Kabushiki Kaisha Liquid-droplet jetting head and liquid-droplet jetting apparatus

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7794063B2 (en) 2006-03-15 2010-09-14 Brother Kogyo Kabushiki Kaisha Liquid-droplet jetting head and liquid-droplet jetting apparatus

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