JPH02258347A - Ink jet printer - Google Patents

Ink jet printer

Info

Publication number
JPH02258347A
JPH02258347A JP1078368A JP7836889A JPH02258347A JP H02258347 A JPH02258347 A JP H02258347A JP 1078368 A JP1078368 A JP 1078368A JP 7836889 A JP7836889 A JP 7836889A JP H02258347 A JPH02258347 A JP H02258347A
Authority
JP
Japan
Prior art keywords
piezoelectric film
organic piezoelectric
transistor
desired frequency
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
JP1078368A
Other languages
Japanese (ja)
Inventor
Yoshio Koide
小出 好夫
Masao Tanabe
昌男 田邊
Nobuyasu Sukagaya
菅ケ谷 暢康
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.)
Toppan Inc
Original Assignee
Toppan Printing 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 Toppan Printing Co Ltd filed Critical Toppan Printing Co Ltd
Priority to JP1078368A priority Critical patent/JPH02258347A/en
Publication of JPH02258347A publication Critical patent/JPH02258347A/en
Pending legal-status Critical Current

Links

Landscapes

  • Fax Reproducing Arrangements (AREA)
  • Particle Formation And Scattering Control In Inkjet Printers (AREA)

Abstract

PURPOSE:To enable only a desired frequency component to be applied efficiently by providing a driving circuit in which an IC series resonance circuit is used for an ultrasonic vibrating means. CONSTITUTION:Clock pulses CK at a desired frequency for vibrating an organic piezoelectric film 12 are supplied to a transistor TR1. A driving voltage VR is connected to the transistor TR1, and when the transistor TR1 is turned ON and OFF, a pulse form driving voltage based on the driving voltage deprived of AC components by a choke coil RFC is generated. Between the transistor TR1 and the piezoelectric film 12 is connected an LC series resonance circuit comprising a coil L and a capacitor C1, whereby harmonic components of the pulsed form driving voltage are suppressed. Since the impedance of the piezoelectric film 12 is high, the resonance circuit has a high impedance with a sharp frequency characteristic. Therefore, only desired frequency components are impressed on the piezoelectric film 12, whereby the film 12 is driven at the desired frequency.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 この発明は連続方式のインキジェットプリンタの印字ヘ
ッドに関する。
DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] This invention relates to a print head for a continuous type inkjet printer.

(従来の技術〕 従来の超音波振動子では、構造が複雑であり、各部品の
製造が困難であり、かつ超音波振動子からの振動がイン
キに伝わりにくかった。そこで、このような問題点を解
決するために、超音波振動子の代わりに有機圧電フィル
ムを用いることが考えられる。有機圧電フィルムは柔軟
性、水密性に富むので、バッキングの役割も備えている
とともに、有機圧電フィルムはインキに直に接するので
、振動が伝わりやすい。また、構造上、有機圧電フィル
ムは電極としての蒸着膜等が不要であるという特徴を持
つ。
(Conventional technology) Conventional ultrasonic vibrators have a complicated structure, each part is difficult to manufacture, and the vibrations from the ultrasonic vibrator are difficult to transmit to the ink. In order to solve this problem, it is possible to use an organic piezoelectric film instead of an ultrasonic transducer.Since the organic piezoelectric film is highly flexible and watertight, it also has the role of a backing. Because it is in direct contact with the organic piezoelectric film, vibrations are easily transmitted to it.Also, due to its structure, the organic piezoelectric film does not require a deposited film as an electrode.

【発明が解決しようとする課題〕[Problem to be solved by the invention]

この有機圧電フィルムを駆動する際に高電圧を必要とす
る。トランジスタ素子における高電圧のスイッチングは
困難であり、非常に大きな電圧を消耗する。また、TT
Lレベルでトランジスタ素子をスイッチングし、トラン
スにより電圧を昇圧してもよいが、高周波成分もそのま
ま昇圧される。
A high voltage is required to drive this organic piezoelectric film. High voltage switching in transistor devices is difficult and consumes a significant amount of voltage. Also, T.T.
Although the transistor element may be switched at the L level and the voltage may be boosted by a transformer, the high frequency component is also boosted as is.

この発明は上述した事情に対処すべくなされたもので、
その目的は有機圧電フィルムに高調波成分がなく効率よ
く高電圧の粒子化パルス信号を供給する駆動回路を具備
するインキジェットプリンタを提供することである。
This invention was made to deal with the above-mentioned circumstances,
The object is to provide an inkjet printer equipped with a drive circuit that efficiently supplies a high-voltage atomization pulse signal to an organic piezoelectric film without harmonic components.

〔課題を解決するための手段〕[Means to solve the problem]

この発明によるインキジェットプリンタは、超音波振動
手段を駆動するLC直列共振回路を用いた駆動回路を具
備する。
The inkjet printer according to the present invention includes a drive circuit using an LC series resonant circuit for driving ultrasonic vibration means.

〔作用〕[Effect]

この発明によるインキジェットプリンタによれば、直流
電圧をオン、オフスイッチングして得たパルス電圧をL
C共振回路を介して有機圧電フィルムに印加しているの
で、所望の周波数成分のみが効率よく印加される。
According to the inkjet printer according to the present invention, the pulse voltage obtained by switching on and off the DC voltage is
Since the voltage is applied to the organic piezoelectric film via the C resonance circuit, only desired frequency components are efficiently applied.

〔実施例〕〔Example〕

以下、図面を参照してこの発明によるインキジェットプ
リンタの一実施例を説明する。第1図に示すように、ノ
ズルボディ10の中央部には絶縁体11と電極13が設
けられる。電極13には粒子化パルス信号を発生する駆
動回路50が接続され、ノズルボディ10は接地される
。インキ室15内のインキは加圧されていて、有機圧電
フィルム12は柔軟性に富むので、有機圧電フィルム1
2は電極13とインキに密着される。上述したように導
電性のインキが使われているので、インキを介して有機
圧電フィルム12の前面は接地される。この結果、電極
13から接地に駆動回路50からの駆動電圧(パルス信
号)が印加され、超音波振動が発生し、インキ室15内
のインキが振動し、オリフィスからインキ粒子が噴出す
る。
Hereinafter, one embodiment of an inkjet printer according to the present invention will be described with reference to the drawings. As shown in FIG. 1, an insulator 11 and an electrode 13 are provided at the center of the nozzle body 10. A drive circuit 50 that generates a particulate pulse signal is connected to the electrode 13, and the nozzle body 10 is grounded. Since the ink in the ink chamber 15 is pressurized and the organic piezoelectric film 12 is highly flexible, the organic piezoelectric film 1
2 is brought into close contact with the electrode 13 and the ink. As described above, since conductive ink is used, the front surface of the organic piezoelectric film 12 is grounded through the ink. As a result, a drive voltage (pulse signal) from the drive circuit 50 is applied from the electrode 13 to the ground, ultrasonic vibrations are generated, the ink in the ink chamber 15 vibrates, and ink particles are ejected from the orifice.

第2図に駆動回路50の具体例を示す。有機圧電フィル
ム12は凹路的にはコンデンサとして見なせる。有機圧
電フィルム12を振動させる所望の周波数のクロックパ
ルスCKがトランジスタTRIのベースに供給される。
FIG. 2 shows a specific example of the drive circuit 50. The organic piezoelectric film 12 can be regarded as a capacitor in a concave manner. A clock pulse CK of a desired frequency that vibrates the organic piezoelectric film 12 is supplied to the base of the transistor TRI.

トランジスタTRIのコレクタには高周波チョークコイ
ルRFCを介して駆動電圧(可変電圧)VRが接続され
る。そのため、トランジスタTRIがオン、オフすると
、チョークコイルRFCにより交流分が除去された駆動
電圧に基づくパルス状の駆動電圧が発生される。
A drive voltage (variable voltage) VR is connected to the collector of the transistor TRI via a high frequency choke coil RFC. Therefore, when the transistor TRI is turned on and off, a pulsed drive voltage is generated based on the drive voltage from which the alternating current component has been removed by the choke coil RFC.

トランジスタTRIのコレクタと有機圧電フィルム12
との間には、コイルL1コンデンサ(可変容量コンデン
サ)CIからなるLC直列共振回路が接続される。この
共振回路はバンドパスフィルタを構成するので、パルス
状の駆動電圧のうちの高調波成分が抑圧される。さらに
、有機圧電フィルム12のインピーダンスは高いので、
共振回路のQは高くなり、周波数特性が鋭くなる。従っ
て、高調波成分を有するパルス状の駆動電圧のうちの所
望の周波数成分のみが電力の損失なく効率よく有機圧電
フィルム12に昇圧される。これにより、有機圧電フィ
ルム12はクロックパルスCKの周波数である所望の周
波数で駆動される。
Collector of transistor TRI and organic piezoelectric film 12
An LC series resonant circuit consisting of a coil L1 capacitor (variable capacitor) CI is connected between the two. Since this resonant circuit constitutes a bandpass filter, harmonic components of the pulsed drive voltage are suppressed. Furthermore, since the impedance of the organic piezoelectric film 12 is high,
The Q of the resonant circuit becomes high and the frequency characteristics become sharp. Therefore, only the desired frequency component of the pulsed drive voltage having harmonic components is efficiently boosted to the organic piezoelectric film 12 without loss of power. As a result, the organic piezoelectric film 12 is driven at a desired frequency, which is the frequency of the clock pulse CK.

また、有機圧電フィルムに印加される電圧(V)はクロ
ックパルスCKの電圧をEとすると、v−E−Qとなり
、クロックパルスCKの電圧EのQ倍に昇圧される。
Further, the voltage (V) applied to the organic piezoelectric film becomes v-E-Q, where E is the voltage of the clock pulse CK, and is boosted to Q times the voltage E of the clock pulse CK.

また、トランジスタTRIのコレクタには高周波数のみ
を通し直流成分を遮断するコンデンサC3が接続されて
いる。このため、有機圧電フィルム12が短絡、または
開放となった場合、駆動回路50のインピーダンスが高
くなるので、トランジスタTRIから有機圧電フィルム
12に流れる電流は減少し、有機圧電フィルム12を破
損する危険性が少ない。すなわち、f−1/2π、ロア
1]「〒−+C2)の時(C2は有機圧電フィルム12
の容量)に、トランジスタTRIから有機圧電フィルム
12に流れる電流は最大になり、この条件が満足されな
いと電流は減少する。なお、駆動用トランジスタTRI
はバイポーラ型トランジスタでも、MO8型トランジス
タでもよい。
Further, a capacitor C3 is connected to the collector of the transistor TRI, which allows only high frequencies to pass through and blocks direct current components. Therefore, when the organic piezoelectric film 12 is short-circuited or opened, the impedance of the drive circuit 50 increases, so the current flowing from the transistor TRI to the organic piezoelectric film 12 decreases, and there is a risk of damaging the organic piezoelectric film 12. Less is. That is, when f-1/2π, lower 1] "〒-+C2" (C2 is the organic piezoelectric film 12
The current flowing from the transistor TRI to the organic piezoelectric film 12 reaches a maximum when the capacitance of the transistor TRI reaches a maximum, and if this condition is not satisfied, the current decreases. Note that the driving transistor TRI
may be a bipolar transistor or an MO8 transistor.

有機圧電フィルム12に印加される電圧はリミッタアン
プ52により抑圧され、有機圧電フィルム12に印加さ
れる周波数が位相比較器54でクロックパルスCKの周
波数と比較され、比較結果がコンデンサCIにフィード
バックされる。これにより、有機圧電フィルム12の駆
動周波数が正確にクロックパルスCKの周波数と一致す
る。
The voltage applied to the organic piezoelectric film 12 is suppressed by the limiter amplifier 52, the frequency applied to the organic piezoelectric film 12 is compared with the frequency of the clock pulse CK by the phase comparator 54, and the comparison result is fed back to the capacitor CI. . As a result, the driving frequency of the organic piezoelectric film 12 accurately matches the frequency of the clock pulse CK.

このようにこの実施例によれば、有機圧電フィルムへは
TTLレベルの直流電圧をオン、オフスイッチングして
得たパルス電圧をLC直列共振回路を介して昇圧してい
るので、高調波成分が抑圧され、所望の周波数成分のみ
が効率よく有機圧電フィルムに印加される。また、駆動
回路構成も簡単になる。
As described above, according to this embodiment, since the pulse voltage obtained by switching on and off a TTL level DC voltage is boosted to the organic piezoelectric film via the LC series resonant circuit, harmonic components are suppressed. Then, only the desired frequency components are efficiently applied to the organic piezoelectric film. Furthermore, the drive circuit configuration becomes simpler.

〔発明の効果〕〔Effect of the invention〕

以上説明したようにこの発明によれば、パルス電圧をL
C直列共振回路を介して有機圧電フィルムに昇圧してい
るので、高調波成分が抑圧され、所望の周波数成分の駆
動電圧のみが効率よく有機圧電フィルムに印加される。
As explained above, according to the present invention, the pulse voltage is
Since the voltage is boosted to the organic piezoelectric film via the C series resonant circuit, harmonic components are suppressed and only the drive voltage of the desired frequency component is efficiently applied to the organic piezoelectric film.

また、有機圧電フィルムが短絡、または開放となった場
合でも、有機圧電フィルム及び回路の破損の危険性はな
く、安全策も具備した駆動回路を提供できる。
Further, even if the organic piezoelectric film is short-circuited or opened, there is no risk of damage to the organic piezoelectric film and the circuit, and a drive circuit with safety measures can be provided.

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

第1図はこの発明によるインキジェットプリンタの一実
施例の印字ヘッドを示す断面図、第2図はこの実施例の
駆動回路の四路図である。 10・・・ノズルボディ、12・・・有機圧電フィルム
、14・・・ノズル、50・・・駆動回路。 出願人代理人 弁理士 鈴江武彦 第2図
FIG. 1 is a sectional view showing a print head of an embodiment of an inkjet printer according to the present invention, and FIG. 2 is a four-way diagram of a drive circuit of this embodiment. DESCRIPTION OF SYMBOLS 10... Nozzle body, 12... Organic piezoelectric film, 14... Nozzle, 50... Drive circuit. Applicant's agent Patent attorney Takehiko Suzue Figure 2

Claims (1)

【特許請求の範囲】[Claims]  連続方式のインキジェットプリンタにおいて、超音波
振動手段を駆動するLC直列共振回路を用いた駆動回路
を具備するインキジェットプリンタ。
An inkjet printer of a continuous type, comprising a drive circuit using an LC series resonant circuit for driving an ultrasonic vibration means.
JP1078368A 1989-03-31 1989-03-31 Ink jet printer Pending JPH02258347A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1078368A JPH02258347A (en) 1989-03-31 1989-03-31 Ink jet printer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1078368A JPH02258347A (en) 1989-03-31 1989-03-31 Ink jet printer

Publications (1)

Publication Number Publication Date
JPH02258347A true JPH02258347A (en) 1990-10-19

Family

ID=13660068

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1078368A Pending JPH02258347A (en) 1989-03-31 1989-03-31 Ink jet printer

Country Status (1)

Country Link
JP (1) JPH02258347A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110816062A (en) * 2018-08-10 2020-02-21 精工电子打印科技有限公司 Liquid ejecting head and liquid ejecting recording apparatus

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110816062A (en) * 2018-08-10 2020-02-21 精工电子打印科技有限公司 Liquid ejecting head and liquid ejecting recording apparatus

Similar Documents

Publication Publication Date Title
EP0099683A3 (en) Control system for ink jet printing element
US5657926A (en) Ultrasonic atomizing device
JPS592617B2 (en) ink jetting device
JPS608952B2 (en) Method of recording on a recording member using liquid ink droplets and liquid jet droplet generator
JP2832443B2 (en) Multi-frequency ultrasonic cleaning method and cleaning apparatus
CA2000581A1 (en) Ultrasonic surgical operation device using bolted langevin transducer
US3315102A (en) Piezoelectric liquid cleaning device
KR20170072748A (en) Apparatus for Jetting Fine Liquid Drop and Method therefor
DE4036618C3 (en) Device for driving a piezoelectric vibrator
JPH02258347A (en) Ink jet printer
JP2001158109A (en) Print head cleaner
TW423967B (en) Ultrasonic beauty culture apparatus
JP7228216B2 (en) Solid-state oscillator circuit, ultrasonic beauty device
JPS6118844U (en) ink droplet ejecting device
KR20040022550A (en) Piezo-electric vibration unit using a ultrasonic
JPH04150968A (en) Ultrasonic wave atomizer
WO2004011154A2 (en) Droplet generation by transverse disturbances
JPS592854A (en) Ink jet printer
JPH03155953A (en) Ink jet head
JPH08281165A (en) Ultrasonic atomizing device
JP2000301088A (en) Method for cleaning printing mask and apparatus for cleaning printing mask
JP3301491B2 (en) Reactant sensing device
SU929241A1 (en) Vibration liquid sprayer
JPH03167055A (en) Drive unit for vibrator and waterdrop eliminator using the same
JPH05212867A (en) Electrostatic ink jet recording apparatus