JPH09164671A - Ink jet recording head - Google Patents

Ink jet recording head

Info

Publication number
JPH09164671A
JPH09164671A JP32692895A JP32692895A JPH09164671A JP H09164671 A JPH09164671 A JP H09164671A JP 32692895 A JP32692895 A JP 32692895A JP 32692895 A JP32692895 A JP 32692895A JP H09164671 A JPH09164671 A JP H09164671A
Authority
JP
Japan
Prior art keywords
plate
piezoelectric element
recording head
common electrode
ink jet
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.)
Granted
Application number
JP32692895A
Other languages
Japanese (ja)
Other versions
JP2822963B2 (en
Inventor
Takeshi Ito
健史 伊藤
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 JP7326928A priority Critical patent/JP2822963B2/en
Publication of JPH09164671A publication Critical patent/JPH09164671A/en
Application granted granted Critical
Publication of JP2822963B2 publication Critical patent/JP2822963B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related 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
    • B41J2/005Typewriters 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
    • B41J2/01Ink jet
    • B41J2/135Nozzles
    • B41J2/14Structure thereof only for on-demand ink jet heads
    • B41J2/14201Structure of print heads with piezoelectric elements
    • B41J2/14274Structure of print heads with piezoelectric elements of stacked structure type, deformed by compression/extension and disposed on a diaphragm

Landscapes

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

Abstract

PROBLEM TO BE SOLVED: To eliminate a flexible wiring plate, make a recording head compact, and improve its assembling property by using a vibrating plate having conductivity and providing a connecting section which connects the vibrating plate and a common electrode electrically. SOLUTION: A bottom plate 221 having a plurality of nozzles 20 is prepared. A passage plate 223 having independent passages corresponding to each nozzle 20 is formed on the bottom plate 221. The passage plate 223 and a vibrating plate 2 are connected so as to fit protrusions of the vibrating plate 2 in the passages of the passage plate 223, so that a pressure chamber 222 is formed. On both side faces of a piezoelectric element 10 having a laminate structure, an individual electrode 14 as an outer electrode and a common electrode 16 are formed and a groove is formed by conforming to a nozzle pitch so as to separate a plurality of piezoelectric elements 10. Next, after a piezoelectric element group 12 is polarized and their operations are confirmed, the vibrating plate 2 is adhered so as to make the piezoelectric elements 10 and the protrusions correspond to each other. Successively, a corner formed by the common electrode 16 and the vibrating plate 2 is coated with, for example, a conductive adhesive so as to form a connecting section 4. On the other hand, a flexible wiring plate 14f is connected to the individual electrode 14.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【発明の属する技術分野】本発明は、インクジェット式
プリンタにおける記録ヘッドに関し、詳しくは、圧電素
子によってインクを吐出させるインクジェット記録ヘッ
ドに関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording head in an ink jet printer, and more particularly, to an ink jet recording head for discharging ink by a piezoelectric element.

【0002】[0002]

【従来の技術】図3及び図4は従来のインクジェット記
録ヘッドを示し、図3は外観斜視図、図4は図3におけ
るIV−IV線縦断面図である。以下、この図面に基づき説
明する。
3 and 4 show a conventional ink jet recording head, FIG. 3 is an external perspective view, and FIG. 4 is a vertical sectional view taken along line IV-IV in FIG. Hereinafter, description will be given with reference to this drawing.

【0003】インクジェット記録ヘッドは、複数の圧電
素子10を有する圧電素子群12と、圧電素子10に個
別に設けられた複数の個別電極14と、圧電素子10に
共通に設けられた共通電極16と、圧電素子10で発生
する振動を伝達する振動板18と、圧電素子10に対応
した複数のノズル20を有するとともに振動板18を介
して伝達された圧電素子10の振動に応じてノズル20
のそれぞれからインク滴Idを飛ばすノズルプレート2
2とを備えている。
The ink jet recording head includes a piezoelectric element group 12 having a plurality of piezoelectric elements 10, a plurality of individual electrodes 14 individually provided on the piezoelectric element 10, and a common electrode 16 provided on the piezoelectric element 10. A vibration plate 18 for transmitting vibrations generated by the piezoelectric element 10, a plurality of nozzles 20 corresponding to the piezoelectric element 10, and a nozzle 20 corresponding to the vibration of the piezoelectric element 10 transmitted through the vibration plate 18.
Nozzle plate 2 that blows ink drops Id from each of
2 is provided.

【0004】圧電素子群12は、複数の圧電素子10
と、圧電素子10を連結及び固定する固定板11とから
構成されている。圧電素子10は、個別電極14と共通
電極16との間に印加された駆動電圧によって、伸縮す
るものである。
The piezoelectric element group 12 includes a plurality of piezoelectric elements 10.
And a fixing plate 11 for connecting and fixing the piezoelectric element 10. The piezoelectric element 10 expands and contracts by a driving voltage applied between the individual electrode 14 and the common electrode 16.

【0005】個別電極14は、圧電素子10の数だけあ
り、フレキシブル配線板(以下、「FPC」という。)
14fによって、図示しない駆動回路に接続されてい
る。フレキシブル配線板14fの各導線は、互いに短絡
しないように絶縁化されている。共通電極16は、圧電
素子10の数に関係なく単数として扱われ、FPC16
fによって図示しない駆動回路に接続されている。
The number of the individual electrodes 14 is equal to the number of the piezoelectric elements 10 and is a flexible wiring board (hereinafter referred to as “FPC”).
14f is connected to a drive circuit (not shown). Each conductive wire of the flexible wiring board 14f is insulated so as not to short-circuit each other. The common electrode 16 is treated as a single irrespective of the number of the piezoelectric elements 10, and the FPC 16
It is connected to a drive circuit (not shown) by f.

【0006】振動板18は、弾性を有する金属からな
り、圧電素子10の振動を確実に伝達するための凸部1
81が形成されている。
The vibrating plate 18 is made of an elastic metal and has a convex portion 1 for reliably transmitting the vibration of the piezoelectric element 10.
81 is formed.

【0007】ノズルプレート22は、ノズル20が穿設
された底板221と、各圧電素子10ごとに圧力室22
2を形成する流路板223とから構成されている。圧力
室222は、ノズル20に連通するとともに、インクI
を充填している。
The nozzle plate 22 has a bottom plate 221 in which the nozzles 20 are formed and a pressure chamber 22 for each piezoelectric element 10.
2 and a flow path plate 223 forming the second. The pressure chamber 222 communicates with the nozzle 20 and the ink I
Is filled.

【0008】複数の個別電極14のいずれかを選択して
駆動電圧を印加すると、その個別電極14に対応する圧
電素子10が例えば図2において上下方向に振動する。
すなわち、振動板18の凸部181も上下動することに
より、圧力室222内のインクIがノズル20から吐出
される。
When any one of the plurality of individual electrodes 14 is selected and a drive voltage is applied, the piezoelectric element 10 corresponding to the individual electrode 14 vibrates, for example, in the vertical direction in FIG.
That is, the ink I in the pressure chamber 222 is ejected from the nozzle 20 by moving the projection 181 of the vibration plate 18 up and down.

【0009】なお、個別電極14及び共通電極16は、
どちらも振動板18に電気的に接していない。
The individual electrode 14 and the common electrode 16 are
Neither is in electrical contact with diaphragm 18.

【0010】[0010]

【発明が解決しようとする課題】FPC16fの導線
は、圧電素子10の全てを同時に通電しても問題が生じ
ないように、十分な断面積を有している。その理由は、
この断面積が不十分であると、抵抗値が大きくなること
により、異常な電圧降下や発熱による断線が生じるから
である。そのため、FPC16fのような構造が必要と
なる。しかし、FPC16fを用いることは、小型化を
妨げるとともに、組立性も悪くしていた。
The conducting wire of the FPC 16f has a sufficient sectional area so that no problem occurs even if all the piezoelectric elements 10 are energized simultaneously. The reason is,
This is because if the cross-sectional area is insufficient, the resistance value becomes large, causing an abnormal voltage drop or disconnection due to heat generation. Therefore, a structure like the FPC 16f is required. However, the use of the FPC 16f has hindered downsizing and also has deteriorated assemblability.

【0011】[0011]

【発明の目的】そこで、本発明の目的は、小型でしかも
組立性の良いインクジェット記録ヘッドを提供すること
にある。
SUMMARY OF THE INVENTION An object of the present invention is to provide an ink jet recording head which is small in size and has good assemblability.

【0012】[0012]

【課題を解決するための手段】本発明に係るインクジェ
ット記録ヘッドは、複数の圧電素子を有する圧電素子群
と、前記圧電素子に個別に設けられた複数の個別電極
と、前記圧電素子に共通に設けられた共通電極と、前記
複数の圧電素子で発生する振動を伝達する振動板と、前
記複数の圧電素子に対応した複数のノズルを有するとと
もに前記振動板を介して伝達された当該圧電素子の振動
に応じて当該ノズルのそれぞれからインク滴を飛ばすノ
ズルプレートとを備えている。そして、前記振動板が導
電性を有し、前記振動板と前記共通電極とを電気的に接
続する接続部が設けられたことを特徴としている。前記
接続部は、導電性接着剤又は導電性ペーストとしてもよ
い。
According to the present invention, there is provided an ink jet recording head comprising: a group of piezoelectric elements having a plurality of piezoelectric elements; a plurality of individual electrodes provided individually on the piezoelectric elements; A common electrode provided, a diaphragm for transmitting vibrations generated by the plurality of piezoelectric elements, and a plurality of nozzles corresponding to the plurality of piezoelectric elements, and a plurality of nozzles corresponding to the plurality of piezoelectric elements, which are transmitted through the diaphragm. A nozzle plate for ejecting ink droplets from each of the nozzles in response to vibration. The vibrating plate is electrically conductive, and a connecting portion for electrically connecting the vibrating plate and the common electrode is provided. The connection portion may be a conductive adhesive or a conductive paste.

【0013】振動板と共通電極とは接続部を介して導通
しているので、例えば振動板を接地すれば、共通電極も
接地される。ここで、複数の個別電極のいずれかを選択
して駆動電圧を印加すると、その個別電極と共通電極に
よって挟まれた圧電素子が振動する。この振動は振動板
を介してノズルプレートに伝達され、ノズルからインク
滴が吐出される。
Since the diaphragm and the common electrode are electrically connected via the connecting portion, for example, if the diaphragm is grounded, the common electrode is also grounded. Here, when any one of the plurality of individual electrodes is selected and a drive voltage is applied, the piezoelectric element sandwiched between the individual electrode and the common electrode vibrates. This vibration is transmitted to the nozzle plate via the vibration plate, and the ink droplet is ejected from the nozzle.

【0014】[0014]

【発明の実施の形態】図1及び図2は本発明に係るイン
クジェット記録ヘッドの一実施形態を示し、図1は外観
斜視図、図2は図1におけるII−II線縦断面図である。
以下、この図面に基づき説明する。ただし、図3及び図
4と同一部分は同一符号を付すことにより重複説明を省
略する。
1 and 2 show an embodiment of an ink jet recording head according to the present invention. FIG. 1 is an external perspective view, and FIG. 2 is a vertical sectional view taken along the line II-II in FIG.
Hereinafter, description will be given with reference to this drawing. However, the same parts as those in FIGS. 3 and 4 are denoted by the same reference numerals, and redundant description will be omitted.

【0015】インクジェット記録ヘッドは、複数の圧電
素子10を有する圧電素子群12と、圧電素子10に個
別に設けられた複数の個別電極14と、圧電素子10に
共通に設けられた共通電極16と、圧電素子10で発生
する振動を伝達するとともに導電性を有する振動板2
と、圧電素子10に対応した複数のノズル20を有する
とともに振動板2を介して伝達された圧電素子10の振
動に応じてノズル20のそれぞれからインク滴Idを飛
ばすノズルプレート22と、振動板2と共通電極16と
を電気的に接続する接続部4とを備えている。
The ink jet recording head includes a piezoelectric element group 12 having a plurality of piezoelectric elements 10, a plurality of individual electrodes 14 individually provided on the piezoelectric elements 10, and a common electrode 16 commonly provided on the piezoelectric elements 10. Diaphragm 2 that transmits vibration generated in piezoelectric element 10 and has conductivity.
A nozzle plate 22 having a plurality of nozzles 20 corresponding to the piezoelectric element 10 and ejecting ink droplets Id from each of the nozzles 20 in accordance with the vibration of the piezoelectric element 10 transmitted via the vibration plate 2; And a connection section 4 for electrically connecting the common electrode 16 to the common electrode 16.

【0016】振動板2は、従来から振動板として用いら
れている電鋳ニッケルでよい。電鋳ニッケルとすれば、
特別な設計変更を必要としないので好ましい。
The diaphragm 2 may be made of electroformed nickel conventionally used as a diaphragm. With electroformed nickel,
This is preferable because no special design change is required.

【0017】接続部4は、導電性接着剤又は導電性ペー
ストとすることが好ましい。導電性接着剤又は導電性ペ
ーストは、塗布前は流動体であるので、所望の形状に簡
単に広げることができる。また、接続部4は、半田付け
やワイヤボンディングにより形成してもよい。
The connecting portion 4 is preferably made of a conductive adhesive or a conductive paste. Since the conductive adhesive or the conductive paste is a fluid before being applied, it can be easily spread into a desired shape. Further, the connection portion 4 may be formed by soldering or wire bonding.

【0018】次に、本発明に係るインクジェット記録ヘ
ッドの製造方法を説明する。
Next, a method for manufacturing an ink jet recording head according to the present invention will be described.

【0019】まず、複数のノズル20を有する底板22
1を用意し、各ノズル20に対応する独立した流路(圧
力室222となる部分)を有する流路板223を底板2
21上に形成する。流路板223及び底板221は、例
えば合成樹脂等の絶縁体である。続いて、流路板223
の流路に振動板2の凸部21を合わせるように、流路板
223と振動板2とを接合することにより、圧力室22
2を形成する。続いて、積層構造の圧電素子10の両側
面に外部電極である個別電極14及び共通電極16を形
成し、ノズルピッチに合わせて溝加工を施すことによ
り、複数の圧電素子10に分離する。続いて、圧電素子
群12を、分極及び動作特性確認後、圧電素子10と凸
部21が対応するように、振動板2に接着する。続い
て、共通電極16と振動板2とのなす角に例えば導電性
接着剤を塗布して、接続部4を形成する。一方、個別電
極14にはFPC14fを接続する。導電性接着剤によ
る接続部4の形成は、FPC14fの接続に比べて、極
めて容易である。
First, a bottom plate 22 having a plurality of nozzles 20
1 and a flow path plate 223 having an independent flow path (a part to be a pressure chamber 222) corresponding to each nozzle 20 is attached to the bottom plate 2
21 is formed. The channel plate 223 and the bottom plate 221 are insulators such as a synthetic resin, for example. Then, the flow path plate 223
By joining the flow path plate 223 and the vibration plate 2 so that the projection 21 of the vibration plate 2 matches the flow path of
Form 2 Subsequently, the individual electrodes 14 and the common electrodes 16 which are external electrodes are formed on both side surfaces of the piezoelectric element 10 having a laminated structure, and the grooves are formed in accordance with the nozzle pitch to separate the piezoelectric elements 10 into a plurality of piezoelectric elements 10. Subsequently, after the polarization and operation characteristics of the piezoelectric element group 12 are confirmed, the piezoelectric element group 12 is bonded to the vibration plate 2 so that the piezoelectric element 10 and the projection 21 correspond to each other. Subsequently, for example, a conductive adhesive is applied to an angle between the common electrode 16 and the diaphragm 2 to form the connection portion 4. On the other hand, the FPC 14f is connected to the individual electrode 14. The formation of the connection portion 4 using the conductive adhesive is extremely easy as compared with the connection of the FPC 14f.

【0020】次に、本発明に係るインクジェット記録ヘ
ッドの動作を説明する。
Next, the operation of the ink jet recording head according to the present invention will be described.

【0021】振動板2と共通電極16とは接続部4を介
して導通しているので、例えば振動板2を接地すれば、
共通電極16も接地される。ここで、複数の個別電極1
4のいずれかを選択して駆動電圧を印加すると、その個
別電極14と共通電極16によって挟まれた圧電素子1
0が振動する。この振動は振動板2を介してノズルプレ
ート22に伝達され、ノズル20からインク滴Idが吐
出される。
Since the diaphragm 2 and the common electrode 16 are electrically connected via the connecting portion 4, for example, if the diaphragm 2 is grounded,
The common electrode 16 is also grounded. Here, a plurality of individual electrodes 1
4 and the drive voltage is applied, the piezoelectric element 1 sandwiched between the individual electrode 14 and the common electrode 16
0 vibrates. This vibration is transmitted to the nozzle plate 22 via the vibration plate 2, and the ink droplet Id is ejected from the nozzle 20.

【0022】[0022]

【発明の効果】本発明に係るインクジェット記録ヘッド
によれば、導電性を有する振動板と共通電極とを電気的
に接続する接続部を設けたことにより、振動板を介して
共通電極に電圧を印加できるので、従来必要であったF
PCを不要にできる。したがって、小型化を達成でき
る。しかも、製造工程を簡略化できることに加え、振動
板はどこからでも導線を引き出すことができるので、組
立性も向上できる。
According to the ink jet recording head of the present invention, the connection portion for electrically connecting the conductive diaphragm and the common electrode is provided, so that a voltage is applied to the common electrode via the diaphragm. Can be applied, so that F
PC can be eliminated. Therefore, downsizing can be achieved. Moreover, in addition to simplifying the manufacturing process, the diaphragm can lead out the conductive wire from anywhere, so that the assemblability can be improved.

【0023】また、接続部を導電性接着剤又は導電性ペ
ーストとすると、塗布するだけで接続部を形成できると
ともに、塗布前は流動体であるので所望の形状に簡単に
広げることができるので、製造工程をより簡略化でき
る。
Further, when the connecting portion is made of a conductive adhesive or a conductive paste, the connecting portion can be formed simply by coating, and since it is a fluid before coating, it can be easily spread into a desired shape. The manufacturing process can be further simplified.

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

【図1】本発明に係るインクジェット記録ヘッドの一実
施形態を示す外観斜視図である。
FIG. 1 is an external perspective view illustrating an embodiment of an ink jet recording head according to the present invention.

【図2】図1におけるII−II線縦断面図である。FIG. 2 is a vertical sectional view taken along line II-II in FIG.

【図3】従来のインクジェット記録ヘッドを示す外観斜
視図である。
FIG. 3 is an external perspective view showing a conventional ink jet recording head.

【図4】図3におけるIV−IV線縦断面図である。FIG. 4 is a vertical sectional view taken along line IV-IV in FIG.

【符号の説明】[Explanation of symbols]

2 振動板 4 接続部 10 圧電素子 12 圧電素子群 14 個別電極 16 共通電極 20 ノズル 22 ノズルプレート Id インク滴 2 Vibration plate 4 Connection part 10 Piezoelectric element 12 Piezoelectric element group 14 Individual electrode 16 Common electrode 20 Nozzle 22 Nozzle plate Id Ink droplet

Claims (3)

【特許請求の範囲】[Claims] 【請求項1】 複数の圧電素子を有する圧電素子群と、
前記圧電素子に個別に設けられた複数の個別電極と、前
記圧電素子に共通に設けられた共通電極と、前記複数の
圧電素子で発生する振動を伝達する振動板と、前記複数
の圧電素子に対応した複数のノズルを有するとともに前
記振動板を介して伝達された当該圧電素子の振動に応じ
て当該ノズルのそれぞれからインク滴を飛ばすノズルプ
レートとを備えたインクジェット記録ヘッドにおいて、 前記振動板が導電性を有し、前記振動板と前記共通電極
とを電気的に接続する接続部が設けられたことを特徴と
するインクジェット記録ヘッド。
A piezoelectric element group having a plurality of piezoelectric elements;
A plurality of individual electrodes individually provided to the piezoelectric element, a common electrode commonly provided to the piezoelectric element, a vibration plate for transmitting the vibration generated in the plurality of piezoelectric elements, and the plurality of piezoelectric elements In an inkjet recording head having a plurality of corresponding nozzles and a nozzle plate for ejecting ink droplets from each of the nozzles in response to vibration of the piezoelectric element transmitted through the diaphragm, the diaphragm is electrically conductive. An ink jet recording head, which has a property and is provided with a connecting portion for electrically connecting the diaphragm and the common electrode.
【請求項2】 前記接続部が導電性接着剤からなる請求
項1記載のインクジェット記録ヘッド。
2. The ink jet recording head according to claim 1, wherein said connection portion is made of a conductive adhesive.
【請求項3】 前記接続部が導電性ペーストからなる請
求項1記載のインクジェット記録ヘッド。
3. The ink jet recording head according to claim 1, wherein said connection portion is made of a conductive paste.
JP7326928A 1995-12-15 1995-12-15 Inkjet recording head Expired - Fee Related JP2822963B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7326928A JP2822963B2 (en) 1995-12-15 1995-12-15 Inkjet recording head

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7326928A JP2822963B2 (en) 1995-12-15 1995-12-15 Inkjet recording head

Publications (2)

Publication Number Publication Date
JPH09164671A true JPH09164671A (en) 1997-06-24
JP2822963B2 JP2822963B2 (en) 1998-11-11

Family

ID=18193337

Family Applications (1)

Application Number Title Priority Date Filing Date
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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006150808A (en) * 2004-11-30 2006-06-15 Brother Ind Ltd Liquid transfer device
JP2006192771A (en) * 2005-01-14 2006-07-27 Brother Ind Ltd Inkjet head
JP2014069483A (en) * 2012-09-28 2014-04-21 Brother Ind Ltd Ink jet head and method of manufacturing the same

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07156397A (en) * 1993-12-09 1995-06-20 Ricoh Co Ltd Ink jet recording device

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07156397A (en) * 1993-12-09 1995-06-20 Ricoh Co Ltd Ink jet recording device

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006150808A (en) * 2004-11-30 2006-06-15 Brother Ind Ltd Liquid transfer device
JP4687083B2 (en) * 2004-11-30 2011-05-25 ブラザー工業株式会社 Liquid transfer device
JP2006192771A (en) * 2005-01-14 2006-07-27 Brother Ind Ltd Inkjet head
US7798614B2 (en) 2005-01-14 2010-09-21 Brother Kogyo Kabushiki Kaisha Inkjet head
JP4670356B2 (en) * 2005-01-14 2011-04-13 ブラザー工業株式会社 Inkjet head
JP2014069483A (en) * 2012-09-28 2014-04-21 Brother Ind Ltd Ink jet head and method of manufacturing the same

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