JPS6226914B2 - - Google Patents
Info
- Publication number
- JPS6226914B2 JPS6226914B2 JP54056016A JP5601679A JPS6226914B2 JP S6226914 B2 JPS6226914 B2 JP S6226914B2 JP 54056016 A JP54056016 A JP 54056016A JP 5601679 A JP5601679 A JP 5601679A JP S6226914 B2 JPS6226914 B2 JP S6226914B2
- Authority
- JP
- Japan
- Prior art keywords
- piezoelectric element
- ink
- voltage
- waveform
- inductive element
- 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
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
- B41J2/04581—Control methods or devices therefor, e.g. driver circuits, control circuits controlling heads based on piezoelectric elements
-
- 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
- B41J2/0452—Control methods or devices therefor, e.g. driver circuits, control circuits reducing demand in current or voltage
-
- 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
Landscapes
- Particle Formation And Scattering Control In Inkjet Printers (AREA)
Description
【発明の詳細な説明】
本発明はインクジエツト記録装置のヘツド駆動
回路に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a head drive circuit for an ink jet recording apparatus.
従来この種の駆動回路を第１図、第２図を用い
て説明する。第１図は従来の回路構成、第２図は
圧電素子ヘツドドライバ１回路分を示す。第１図
においてヘツド用電圧源１で発生された電圧はヘ
ツドドライバ群２に供給され、記録信号入力群３
に入力される信号に応じてヘツドドライバ群２は
選択的に圧電素子群４をスイツチングする。記録
信号入力３に入力される信号は連続的に入力され
るものではなく、したがつてヘツド用電圧源１と
しては常時出力を必要とせず常時規定の電圧を維
持していることは無駄な電力を消費することにな
り不経済である。また第２図において、圧電素子
４―ｎを記録信号入力３―ｎに応じてスイツチン
グした際、蓄積される電荷は、放電用抵抗５―ｎ
によつて放電されるように構成されており、スイ
ツチング素子６―ｎがオン状態において放電用抵
抗５―ｎは圧電素子４―ｎに流入する電流とは無
関係の電流が流れ、無駄な電力を消費するためヘ
ツド用電圧源としては出力電流容量が大きくなり
不経済であり且つ大型化する。また、このヘツド
用電圧源１は数十〜数百Ｖの出力電圧を必要とし
圧電素子群４に充電する際パルス状の電流が流れ
るために大容量の出力コンデンサを必要とする。
このため不要時にも出力を保持することは場合に
よつては危険を伴なう。 A conventional drive circuit of this type will be explained with reference to FIGS. 1 and 2. FIG. 1 shows a conventional circuit configuration, and FIG. 2 shows one circuit of a piezoelectric element head driver. In FIG. 1, the voltage generated by the head voltage source 1 is supplied to the head driver group 2, and the recording signal input group 3
The head driver group 2 selectively switches the piezoelectric element group 4 according to the signal input to the head driver group 2. The signal input to the recording signal input 3 is not input continuously, so the head voltage source 1 does not require constant output and constantly maintaining a specified voltage is a waste of power. This is uneconomical as it consumes a lot of energy. Further, in FIG. 2, when the piezoelectric element 4-n is switched in accordance with the recording signal input 3-n, the accumulated charge is transferred to the discharging resistor 5-n.
When the switching element 6-n is on, a current unrelated to the current flowing into the piezoelectric element 4-n flows through the discharging resistor 5-n, thereby wasting power. Because of the consumption, the output current capacity becomes large as a voltage source for a head, making it uneconomical and bulky. Further, this head voltage source 1 requires an output voltage of several tens to several hundreds of volts, and since a pulsed current flows when charging the piezoelectric element group 4, a large-capacity output capacitor is required.
Therefore, holding the output even when it is not needed may be dangerous in some cases.
以上説明した如く、従来の構成においては、前
述した種々の欠点があつた。本発明の目的は、イ
ンクジエツトヘツド駆動用高圧電源を省き、小型
化および低消費電力化を図ることにある。本発明
は第３図に示すごとく圧電素子１０に適当な値を
持つインダクテイブ素子９を並列に接続し、スイ
ツチング素子６―ｎに適当なパルス巾を持つ記録
信号を記録信号入力８より入力するとスイツチン
グ素子６―ｎがオフする瞬間にいわゆるレンツの
法則に従う逆起電力がインダクテイブ素子９の両
端に発生し圧電素子１０に印加されるものであ
る。 As explained above, the conventional configuration has the various drawbacks mentioned above. An object of the present invention is to eliminate the need for a high-voltage power supply for driving an inkjet head, thereby achieving miniaturization and lower power consumption. In the present invention, as shown in FIG. 3, an inductive element 9 having an appropriate value is connected in parallel to a piezoelectric element 10, and a recording signal having an appropriate pulse width is inputted to a switching element 6-n from a recording signal input 8. At the moment when the elements 6-n turn off, a back electromotive force according to the so-called Lenz's law is generated across the inductive element 9 and applied to the piezoelectric element 10.
第３図を用いた実験によるとインダクテイブ素
子９として36mHのインダクタンスを持つインダ
クタを用い電源供給端子７に3Vの電圧を与え記
録信号入力８に入力されるパルス巾を約600μＳ
に設定すると圧電素子１０の両端には約120Vの
電圧パルスを得ることができた。また100mHの
インダクタに12Vの電圧を加え記録信号入力８に
入力されるパルス巾を適当に変化させる圧電素子
１０の両端には数百Ｖまでの電圧パルスを得るこ
とが可能であつた。第３図の回路構成で圧電素子
１０の両端に発生する電圧パルスの高さを変化さ
せるには、記録信号入力８に入力されるパレス巾
を、もしくは電源供給端子７に印加する電圧を変
えることにより容易に実現される。また電圧パル
スの電圧、波形を変化させる方法としては第４図
の如き電圧、波形調整手段を付加することで可変
となる。この構成においては記録信号入力８に入
力された信号はパルス巾可変回路１４により適当
な巾のパルスに変換されたスイツチング素子６―
ｎの制御入力となる。スイツチング素子６―ｎを
オフにした瞬間圧電素子１０の両端には前述した
如く圧電素子１０を駆動するに十分な電圧を得る
ことができ、この電圧波形を変化させるためには
可変抵抗１１、コンデンサ１２、可変インダクタ
１３の抵抗値、自己インダクタンスを変化させる
ことによつて実施可能である。次に、第５図を用
いて、インダクテイブ素子９の両端に発生する逆
起電力についてさらに詳述する。第５図におい
て、波形５０は、スイツチング素子６―ｎに入力
されるパルスを示しており、波形５１は、スイツ
チング素子６―ｎのコレクタ電圧を示している。
ここで、動作を説明すると以下のようになる。時
刻t1においてスイツチング素子６―ｎはオンとな
り、インダクテイブ素子９に電流が流れ始める。
そして、スイツチング素子６―ｎは、該素子をオ
フにした場合に圧電素子１０を駆動しインクを噴
射させるに足る動作電圧を得られる時刻t2まで、
オン状態が保持されその後、オフとなる。 According to an experiment using FIG. 3, an inductor with an inductance of 36mH was used as the inductive element 9, a voltage of 3V was applied to the power supply terminal 7, and the pulse width input to the recording signal input 8 was approximately 600 μS.
When set to , a voltage pulse of about 120V could be obtained across the piezoelectric element 10. Further, by applying a voltage of 12 V to a 100 mH inductor and appropriately changing the pulse width input to the recording signal input 8, it was possible to obtain a voltage pulse of up to several hundred V across the piezoelectric element 10. In order to change the height of the voltage pulse generated across the piezoelectric element 10 in the circuit configuration shown in FIG. 3, the pulse width input to the recording signal input 8 or the voltage applied to the power supply terminal 7 can be changed. This can be easily realized by Further, the voltage and waveform of the voltage pulse can be changed by adding voltage and waveform adjustment means as shown in FIG. In this configuration, the signal inputted to the recording signal input 8 is converted into a pulse of an appropriate width by the pulse width variable circuit 14, and the switching element 6--
n control input. As described above, a voltage sufficient to drive the piezoelectric element 10 can be obtained across the piezoelectric element 10 at the moment when the switching element 6-n is turned off, and in order to change this voltage waveform, the variable resistor 11 and the capacitor 12. This can be implemented by changing the resistance value and self-inductance of the variable inductor 13. Next, using FIG. 5, the back electromotive force generated at both ends of the inductive element 9 will be explained in further detail. In FIG. 5, a waveform 50 represents a pulse input to the switching element 6-n, and a waveform 51 represents the collector voltage of the switching element 6-n.
Here, the operation will be explained as follows. At time t1 , switching element 6-n turns on, and current begins to flow through inductive element 9.
Then, the switching element 6-n operates until time t2 when it can obtain an operating voltage sufficient to drive the piezoelectric element 10 and eject ink when the switching element is turned off.
It remains on and then turns off.
この時刻t2において、インダクテイブ素子９の
スイツチング素子６―ｎ側の端子には、逆起電力
の法則により高電圧が発生し、インダクテイブ素
子９と並列に接続された圧電素子１０の両端に
は、該高電圧が印加される。 At this time t2 , a high voltage is generated at the terminal of the inductive element 9 on the switching element 6-n side due to the law of back electromotive force, and the both ends of the piezoelectric element 10 connected in parallel with the inductive element 9 are The high voltage is applied.
ここで、圧電素子１０に印加される電圧は、波
形５１０に示されるように振動するのであるが、
インクの噴射に対して影響を与えるのは、最初の
振幅の大きい５１ａの部分のみである。他の振幅
の小さい部分は、インクの噴射には影響を与えな
い。これは、以下の理由からである。すなわち
(a) インクには、粘性があるので、圧電素子１０
の機械的振動が微少なものであつた場合、イン
クの粘性がまさり、インクの移動、変形等は生
じない。 Here, the voltage applied to the piezoelectric element 10 oscillates as shown in the waveform 510.
Only the initial large amplitude portion 51a affects the ink jetting. Other small amplitude parts do not affect ink ejection. This is for the following reasons. That is, (a) since the ink has viscosity, the piezoelectric element 10
If the mechanical vibration is minute, the viscosity of the ink will be greater and no movement or deformation of the ink will occur.
(b) 第６図に示すように、５１ａの部分によつて
インク滴が噴射された後においては、インクの
表面部分６２は、細孔６１の内部に入り込んで
おり、この状態で、若干の圧電素子１０の機械
的振動があつたとしても、６２ａ，６２ｂに示
すように、細孔内部の振動にとどまり、インク
の噴射には至らない。(b) As shown in FIG. 6, after the ink droplet is ejected by the portion 51a, the ink surface portion 62 has entered the inside of the pore 61, and in this state, some Even if there is mechanical vibration of the piezoelectric element 10, as shown at 62a and 62b, the vibration remains within the pores and does not result in ink being ejected.
又、第４図の実施例を用いた場合には、波形
５１０の形状を所望のものに変化させることが
できる。すなわち、波形５１０の振幅を大きく
しようとすれば可変インダクタ１３のインダク
タンスの値を大きくし、又、波形５１０の振動
を早く収束させようとすれば、可変抵抗１１の
値を大きくし、波形５１０の振動をゆつくり収
束させようとする場合には、コンデンサ１２の
値を大きくする。 Furthermore, when the embodiment shown in FIG. 4 is used, the shape of the waveform 510 can be changed to a desired shape. That is, if you want to increase the amplitude of the waveform 510, increase the inductance value of the variable inductor 13, and if you want to quickly converge the vibration of the waveform 510, increase the value of the variable resistor 11 to increase the amplitude of the waveform 510. If the vibration is to be slowly converged, the value of the capacitor 12 is increased.
以上の如く本発明は、前述の従来の方法とは全
く異なり、必要な時にのみ圧電素子の駆動パルス
を得ることができ、且つ低電圧で圧電素子を駆動
することが可能であり、本発明の目的にかなう非
常に有益な発明である。またこの方法は、第１図
の如く多数の圧電素子を有するインクジエツトヘ
ツド駆動にも用いることができる。 As described above, the present invention is completely different from the conventional method described above, in that it is possible to obtain drive pulses for the piezoelectric element only when necessary, and it is also possible to drive the piezoelectric element with a low voltage. This is a very useful invention that serves its purpose. This method can also be used to drive an inkjet head having a large number of piezoelectric elements as shown in FIG.
以上、詳細に示したように本発明は、以下に示
す格別の効果を有する。 As described above in detail, the present invention has the following special effects.
(a) ヘツド駆動用のための高圧電源を特別に用意
する必要がなくなり、装置の小型化、低コスト
化が計れる。(a) There is no need to prepare a special high-voltage power supply for driving the head, and the device can be made smaller and lower in cost.
(b) 高電圧が発生するのは、ごく一瞬なので安全
性が非常に高い。(b) High voltage is generated only momentarily, so safety is extremely high.
(c) 複数のインクノズルを用いる場合等において
は、インク粒子の大きさの均一化等のために個
個のインクノズルごとに圧電素子の印加電圧を
微調整する必要があるが、本願によれば個々の
圧電素子と並列に配置されたインダクテイブ素
子のインダクタンスを微調整すれば良く非常に
簡単に、個々のインクノズルに対する微調整が
可能になる。(c) When using multiple ink nozzles, it is necessary to finely adjust the voltage applied to the piezoelectric element for each ink nozzle in order to make the ink droplets uniform in size, but according to this application, For example, it is only necessary to finely adjust the inductance of an inductive element arranged in parallel with each piezoelectric element, which makes it possible to finely adjust each ink nozzle very easily.
(d) 記録装置のキヤリツジ移動等に使用されるス
テツプモータに使われているコイルを、本願の
インダクテイブ素子として利用することも可能
でその場合には、一層の装置の小型化、低コス
ト化が実現できる。(d) It is also possible to use the coils used in step motors used to move the cartridges of recording devices as the inductive element of the present application, and in that case, the device can be further miniaturized and lowered in cost. realizable.
(e) 逆起電力により生じた電圧波形のうち、最初
の振幅の大きい部分だけが、インク噴射に影響
を有し、他の部分の電圧波形は、インクの粘性
等の理由によりインク噴射に影響を有しないの
で、別の制御手段を有しなくても、必要な電圧
波形部分を利用でき、装置の小型化、低価格化
が実現できる。(e) Of the voltage waveform generated by the back electromotive force, only the first part with large amplitude affects ink jetting, and the other parts of the voltage waveform affect ink jetting due to reasons such as ink viscosity. Therefore, the necessary voltage waveform portion can be used without having a separate control means, and the device can be made smaller and lower in price.
第１図は、従来の構成を示す図であり、第２図
は従来の圧電素子駆動回路を示す図であり、第３
図は本発明の一実施例を示す図であり、第４図は
本発明の他の実施例である。第５図は、インダク
テイブ素子９に生じる逆起電力を説明する図。第
６図は、該逆起電力発生時におけるインクノズル
内のインクの振動を示す図。
１……ヘツド用電圧源、２……ヘツドドライバ
群、３……記録信号入力群、４……圧電素子群、
５―ｎ……放電用抵抗、６―ｎ……スイツチング
素子、７……電源供給端子、８……記録信号入
力、９……インダクテイブ素子、１０……圧電素
子、１１……可変抵抗、１２……コンデンサ、１
３……可変インダクタ、１４……パルス可変回
路。
Fig. 1 is a diagram showing a conventional configuration, Fig. 2 is a diagram showing a conventional piezoelectric element drive circuit, and Fig. 3 is a diagram showing a conventional piezoelectric element drive circuit.
The figure shows one embodiment of the invention, and FIG. 4 shows another embodiment of the invention. FIG. 5 is a diagram illustrating the back electromotive force generated in the inductive element 9. FIG. 6 is a diagram showing the vibration of ink within the ink nozzle when the back electromotive force is generated. 1... Head voltage source, 2... Head driver group, 3... Recording signal input group, 4... Piezoelectric element group,
5-n...discharge resistor, 6-n...switching element, 7...power supply terminal, 8...recording signal input, 9...inductive element, 10...piezoelectric element, 11...variable resistor, 12 ...Capacitor, 1
3...variable inductor, 14...pulse variable circuit.
Claims (1)
電素子に電気信号を印加しインクを加圧し細孔よ
り該インクを噴射させ記録を行なうインクオンデ
マンド型のインクジエツト記録装置において、 電源供給端子に対して前記圧電素子と並列に配
列されたインダクテイブ素子と、 該インダクテイブ素子と前記圧電素子との接続
点に接続され、前記インダクテイブ素子に逆起電
力を生じさせるためのスイツチング手段とから構
成されることを特徴とするインクジエツトヘツド
駆動回路。[Scope of Claims] 1. In an ink-on-demand type inkjet recording device that uses a piezoelectric element as an electromechanical transducer, applies an electric signal to the piezoelectric element, pressurizes ink, and performs recording by ejecting the ink from pores, an inductive element arranged in parallel with the piezoelectric element with respect to a power supply terminal; and a switching means connected to a connection point between the inductive element and the piezoelectric element for generating a back electromotive force in the inductive element. An inkjet head drive circuit comprising:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5601679A JPS55148169A (en) | 1979-05-08 | 1979-05-08 | Ink jet head driving circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5601679A JPS55148169A (en) | 1979-05-08 | 1979-05-08 | Ink jet head driving circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS55148169A JPS55148169A (en) | 1980-11-18 |
| JPS6226914B2 true JPS6226914B2 (en) | 1987-06-11 |
Family
ID=13015255
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5601679A Granted JPS55148169A (en) | 1979-05-08 | 1979-05-08 | Ink jet head driving circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS55148169A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57189860A (en) * | 1981-05-18 | 1982-11-22 | Seiko Epson Corp | Ink jet head-driving method and circuit therefor |
| DE3223636A1 (en) * | 1982-06-24 | 1983-12-29 | Siemens AG, 1000 Berlin und 8000 München | CONTROL CIRCUIT FOR PIEZ CONVERTERS IN INK MOSAIC WRITING DEVICES |
| US4523200A (en) * | 1982-12-27 | 1985-06-11 | Exxon Research & Engineering Co. | Method for operating an ink jet apparatus |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS52126133A (en) * | 1976-04-15 | 1977-10-22 | Matsushita Electric Ind Co Ltd | Ink jet recording device |
-
1979
- 1979-05-08 JP JP5601679A patent/JPS55148169A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS55148169A (en) | 1980-11-18 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US5453767A (en) | Method for forming ink droplets in ink-jet type printer and ink-jet type recording device | |
| EP0046676B2 (en) | Method of operating an on demand-type ink jet head and system therefor | |
| JPS59230762A (en) | Liquid injection head drive device | |
| JPS593272B2 (en) | Recording nozzle control device for ink mosaic printers | |
| JP3262141B2 (en) | Drive circuit for inkjet recording head | |
| JP2010099981A (en) | Fluid jetting apparatus | |
| US6419336B1 (en) | Ink ejector | |
| JPH11170521A (en) | Method and apparatus for ejecting ink droplets | |
| JP4123736B2 (en) | Inkjet printer and drive circuit | |
| JPH11170522A (en) | Method and apparatus for ejecting ink droplets | |
| JPS6226914B2 (en) | ||
| JP3757808B2 (en) | Ink jet printer head drive apparatus and drive method | |
| JP2002273874A (en) | Head driving device and driving method for ink jet printer | |
| JP3225987B2 (en) | Driving apparatus and driving method for inkjet recording head | |
| JP3322276B2 (en) | Driving method and apparatus for inkjet recording head | |
| JPH03190747A (en) | Ink jet recording apparatus | |
| JPH03108550A (en) | Method for driving ink jet head | |
| JPH02136245A (en) | Piezoelectric element driving apparatus | |
| JPH10166579A (en) | Method and apparatus for driving ink jet type printing head | |
| JPH04369543A (en) | Piezoelectric element driving circuit | |
| JP2005231174A (en) | Driving method of ink ejecting apparatus | |
| JPH0134155B2 (en) | ||
| JP2000218782A (en) | Ink jet printer and print head driving device | |
| JPH0226585B2 (en) | ||
| JP2011194641A (en) | Driving circuit for capacitive load |