JPH01237151A - Ink jet head - Google Patents

Ink jet head

Info

Publication number
JPH01237151A
JPH01237151A JP6513588A JP6513588A JPH01237151A JP H01237151 A JPH01237151 A JP H01237151A JP 6513588 A JP6513588 A JP 6513588A JP 6513588 A JP6513588 A JP 6513588A JP H01237151 A JPH01237151 A JP H01237151A
Authority
JP
Japan
Prior art keywords
electrodes
piezoelectric element
ink
droplet
diameter
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
JP6513588A
Other languages
Japanese (ja)
Inventor
Masatoshi Yasuhara
安原　正俊
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 JP6513588A priority Critical patent/JPH01237151A/en
Publication of JPH01237151A publication Critical patent/JPH01237151A/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
    • B41J2/135—Nozzles
    • B41J2/14—Structure thereof only for on-demand ink jet heads
    • B41J2/14201—Structure of print heads with piezoelectric elements
    • B41J2/14233—Structure of print heads with piezoelectric elements of film type, deformed by bending and disposed on a diaphragm
    • 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
    • B41J2/135—Nozzles
    • B41J2/14—Structure thereof only for on-demand ink jet heads
    • B41J2002/14491—Electrical connection

Landscapes

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

Abstract

PURPOSE:To inject ink droplet having a proper diameter without changing an ink droplet speed, by dividing at least one of the electrodes formed to both surfaces of a piezoelectric element into a plurality of electrodes. CONSTITUTION:Electrodes 1, 2, 3 divided into three are formed to the surface of a piezoelectric element 5 and one common electrode 4 is provided to the rear thereof. When a liquid droplet having a large diameter is desired to be obtained, voltage is simultaneously applied to the electrodes 1, 2, 3. As the diameter of the liquid droplet is reduced, the number of the electrodes, to which voltage must be applied, are reduced like the electrodes 2, 3 and the electrode 3 to make it possible to change the diameter of the ink droplet injected from a nozzle. The deformation of the piezoelectric element 5 is transmitted to a vibration plate 7 and the ink in the ink flow passage 6 formed on a base plate 8 is compressed to generate a liquid droplet.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 本発明はインクジェットヘッドに関し、特に圧電素子の
電極構造に関する。DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to an inkjet head, and particularly to an electrode structure of a piezoelectric element.

〔従来の技術〕[Conventional technology]

従来、この種のインクジェットヘッドにおいては、圧電
素子の電極は圧電素子の両面に１つずっ設けられていた
。インク滴の大きさを変えるには圧電素子に印加する電
圧やパルス幅を変えることにより行っていた。Conventionally, in this type of inkjet head, one electrode of the piezoelectric element was provided on both sides of the piezoelectric element. The size of the ink droplet has been changed by changing the voltage and pulse width applied to the piezoelectric element.

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

上述した従来のインクジェットヘッドでは、滴速度を変
えずに滴径だけを変化させるのは困難であり、充分な滴
径の変化を行なうことはできなかった。In the conventional inkjet head described above, it is difficult to change only the droplet diameter without changing the droplet velocity, and it has not been possible to change the droplet diameter sufficiently.

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

本発明のインクジェットヘッドは、圧電素子に電圧を印
加しで圧電素子を屈曲変形させることにより加圧室に圧
力波を発生させてインク滴を噴出せしめるドロップオン
デマンド型インクジェットヘッドにおいて、圧電素子の
両面に形成される電極の少くとも一方を複数個に分割し
たことを特徴とする。The inkjet head of the present invention is a drop-on-demand type inkjet head that ejects ink droplets by generating pressure waves in a pressurizing chamber by bending and deforming the piezoelectric element by applying a voltage to the piezoelectric element. The present invention is characterized in that at least one of the electrodes formed in the above structure is divided into a plurality of electrodes.

〔実施例〕〔Example〕

次に、本発明の一実施例について図面を参照して説明す
る。Next, an embodiment of the present invention will be described with reference to the drawings.

第１図および第２図を参照すると、圧電素子５の表面の
電極１〜３は３分割され（第１図（ａ））、その裏面に
は１つの共通電極４が設けられる（第１図（ｂ））。大
きな径の液滴を得たい場合には電極１．２．３に同時に
電圧を印加する。滴径を小さくするのに従って電極２，
３、電極３と電圧を印加する電極を小さくすることによ
ってノズルより噴出させるインク滴径を変化させること
ができる。Referring to FIGS. 1 and 2, the electrodes 1 to 3 on the front surface of the piezoelectric element 5 are divided into three parts (FIG. 1(a)), and one common electrode 4 is provided on the back surface thereof (FIG. 1(a)). (b)). If it is desired to obtain droplets with a large diameter, a voltage is applied to electrodes 1, 2, and 3 at the same time. As the droplet diameter decreases, the electrode 2,
3. By reducing the size of the electrode 3 and the electrode to which voltage is applied, the diameter of the ink droplet ejected from the nozzle can be changed.

圧電素子５の変形は振動板７に伝えられ、ベースプレー
ト８上に形成されたインク流路６内のインクを圧縮して
液滴を発生させる。The deformation of the piezoelectric element 5 is transmitted to the diaphragm 7, which compresses the ink within the ink flow path 6 formed on the base plate 8 to generate droplets.

〔発明の効果〕〔Effect of the invention〕

以上説明したように、本発明は圧電素子に形成される電
極の少く上も一方を２つ以上に分け、必要とする滴径に
応じて電圧を印加する電極を変えることによって、イン
ク滴速度を変えることなく適切な滴径のインクを噴出す
ることができるという効果がある。As explained above, the present invention divides one of the electrodes formed on the piezoelectric element into two or more, and changes the electrode to which voltage is applied depending on the required droplet diameter, thereby increasing the ink droplet speed. This has the effect that ink with an appropriate droplet size can be ejected without changing the size.

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

第１図は本発明の一実施例を示す平面図、第２図は本発
明の一実施例を示す断面図である。 １．２．３・・・・・・電極、４・・・・・・共通電極
、５・・・・・・圧型素子、６・・・・・・インク流路
、７・・・・・・振動板、８・・・・・ベースプレート
。 代理人　弁理士　　内　原　　　音FIG. 1 is a plan view showing an embodiment of the invention, and FIG. 2 is a sectional view showing an embodiment of the invention. 1.2.3... Electrode, 4... Common electrode, 5... Pressure type element, 6... Ink channel, 7...・Vibration plate, 8...Base plate. Agent Patent Attorney Oto Uchihara

Claims (1)

【特許請求の範囲】[Claims] 圧電素子に電圧を印加して前記圧電素子を屈曲変形させ
ることにより加圧室に圧力波を発生させてインク滴を噴
出せしめるドロップオンデマンド型インクジェットヘッ
ドにおいて、前記圧電素子の両面に形成される電極の少
くとも一方を複数個に分けたことを特徴とするインクジ
ェットヘッド。In a drop-on-demand inkjet head that applies a voltage to a piezoelectric element to bend and deform the piezoelectric element to generate pressure waves in a pressurizing chamber and eject ink droplets, electrodes are formed on both sides of the piezoelectric element. An inkjet head characterized in that at least one of the parts is divided into a plurality of parts.
JP6513588A 1988-03-17 1988-03-17 Ink jet head Pending JPH01237151A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6513588A JPH01237151A (en) 1988-03-17 1988-03-17 Ink jet head

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6513588A JPH01237151A (en) 1988-03-17 1988-03-17 Ink jet head

Publications (1)

Publication Number Publication Date
JPH01237151A true JPH01237151A (en) 1989-09-21

Family

ID=13278133

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6513588A Pending JPH01237151A (en) 1988-03-17 1988-03-17 Ink jet head

Country Status (1)

Country Link
JP (1) JPH01237151A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6020905A (en) * 1997-01-24 2000-02-01 Lexmark International, Inc. Ink jet printhead for drop size modulation
WO2010039494A3 (en) * 2008-09-30 2010-05-27 Fujifilm Dimatix, Inc. Control of velocity through a nozzle

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6020905A (en) * 1997-01-24 2000-02-01 Lexmark International, Inc. Ink jet printhead for drop size modulation
US6079811A (en) * 1997-01-24 2000-06-27 Lexmark International, Inc. Ink jet printhead having a unitary actuator with a plurality of active sections
WO2010039494A3 (en) * 2008-09-30 2010-05-27 Fujifilm Dimatix, Inc. Control of velocity through a nozzle
US8727475B2 (en) 2008-09-30 2014-05-20 Fujifilm Dimatix, Inc. Control of velocity through a nozzle

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