JPH10291313A - Ink-jet type recording head - Google Patents
Ink-jet type recording headInfo
- Publication number
- JPH10291313A JPH10291313A JP11763097A JP11763097A JPH10291313A JP H10291313 A JPH10291313 A JP H10291313A JP 11763097 A JP11763097 A JP 11763097A JP 11763097 A JP11763097 A JP 11763097A JP H10291313 A JPH10291313 A JP H10291313A
- Authority
- JP
- Japan
- Prior art keywords
- ink
- reservoir
- pressure generating
- supply port
- recording head
- 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
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
- B41J2002/14419—Manifold
Landscapes
- Ink Jet (AREA)
- Particle Formation And Scattering Control In Inkjet Printers (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術の分野】本発明は、ノズル開口に連
通する圧力発生室に対応させてたわみ圧電振動子を設
け、圧電振動子により圧力発生室を圧縮してインク滴を
発生させるインクジェット式記録ヘッド、より詳細には
インク容器のインクを圧力発生室に供給するリザ−バの
構造に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ink jet recording method in which a flexible piezoelectric vibrator is provided corresponding to a pressure generating chamber communicating with a nozzle opening, and the piezoelectric vibrator compresses the pressure generating chamber to generate ink droplets. The present invention relates to a head, and more particularly, to a reservoir structure for supplying ink from an ink container to a pressure generating chamber.
【０００２】[0002]
【従来の技術】圧力発生室を構成している弾性板の一部
領域に圧電振動板を設けて圧電振動板のたわみ変位によ
り圧力発生室の容積を変化させてインク滴を発生させる
インクジェット式記録ヘッドは、圧力発生室の広い面積
を変位させることが可能なため、インク滴を安定して発
生させることができるという特徴を備えている。2. Description of the Related Art Ink jet recording in which a piezoelectric vibrating plate is provided in a partial area of an elastic plate constituting a pressure generating chamber and the volume of the pressure generating chamber is changed by bending displacement of the piezoelectric vibrating plate to generate ink droplets. The head is capable of displacing a large area of the pressure generating chamber, so that the head can stably generate ink droplets.
【０００３】このような記録ヘッドは表面に圧電振動板
を有して振動部材を形成する弾性板と、圧力発生室を形
成するスペーサと、スペーサの他面を封止するととも
に、圧力発生室とインク供給口を接続する連通孔と圧力
発生室とノズル開口とを接続する連通孔とを有する蓋部
材と、蓋部材により一方の面が封止され、またインク供
給口を介して各圧力発生室に連通するリザ−バ、及びノ
ズル開口と圧力発生室を接続する連通孔とを備えたリザ
−バ形成板と、リザ−バ形成板の他面を封止するノズル
開口を備えたノズルプレートとをそれぞれ順番に積層し
て一体に構成されている。[0003] Such a recording head has an elastic plate having a piezoelectric vibrating plate on its surface to form a vibrating member, a spacer forming a pressure generating chamber, and sealing the other surface of the spacer. A lid member having a communication hole connecting the ink supply port, a pressure generation chamber, and a communication hole connecting the nozzle opening, one surface of which is sealed by the lid member, and each pressure generation chamber via the ink supply port; A reservoir forming plate having a reservoir communicating with the reservoir, a communication hole connecting the nozzle opening and the pressure generating chamber, and a nozzle plate having a nozzle opening sealing the other surface of the reservoir forming plate. Are sequentially laminated, and are integrally configured.
【０００４】このようなインクジェット式記録ヘッド
は、圧力発生室で消費された分のインクを速やかに補給
するとともに、インク滴吐出後のリザ−バの圧力上昇を
抑えるため、リザ−バには十分な容積が確保されてい
る。このため、リザ−バＣは、図３に示したようにイン
ク導入口Ｄを介して外部のインク容器に接続されてい
て、特に複数列配置された圧力発生室Ｅ、Ｅ、Ｅにイン
クを供給する場合には、分岐部Ｆ、Ｆでのインクの流速
が低いためインクが淀み易く、この領域に気泡が停滞し
やすいという問題がある。[0004] Such an ink jet recording head quickly supplies the ink consumed in the pressure generating chamber and suppresses a rise in the pressure of the reservoir after the ink droplets are ejected. Capacity is secured. For this reason, the reservoir C is connected to an external ink container via the ink inlet D as shown in FIG. 3, and in particular, the ink is supplied to the pressure generating chambers E, E, E arranged in a plurality of rows. When the ink is supplied, there is a problem that the ink tends to stagnate due to the low flow velocity of the ink at the branching portions F, and that air bubbles are likely to stagnate in this region.
【０００５】[0005]
【発明が解決しようとする課題】本発明はこれらの問題
に鑑みてなされたものであって、その目的とするところ
は、インク導入口近傍におけるインク流速を高めてリザ
−バ全体の気泡の排除性を向上させたインクジェット式
記録ヘッドを提供することである。SUMMARY OF THE INVENTION The present invention has been made in view of these problems, and an object of the present invention is to eliminate the air bubbles in the entire reservoir by increasing the ink flow rate near the ink inlet. An object of the present invention is to provide an ink jet recording head with improved performance.
【０００６】[0006]
【課題を解決するための手段】このような問題を解消す
るために本発明においては、圧力発生部材を有する圧力
発生室、該圧力発生室にインクを供給するインク供給
口、該インク供給口を介して前記圧力発生室に連通し、
インク導入口と誘導路で接続されたリザ−バを備えたイ
ンクジェット式記録ヘッドにおいて、前記リザ−バの前
記インク誘導路が形成されている領域の深さが、前記イ
ンク供給口が形成されている領域よりも浅くされてい
て、気泡が停滞しやすいインク誘導路でのインク流速を
高めるようにした。According to the present invention, there is provided a pressure generating chamber having a pressure generating member, an ink supply port for supplying ink to the pressure generating chamber, and an ink supply port. Through the pressure generating chamber via
In an ink jet recording head having a reservoir connected to an ink introduction port by a guide path, a depth of a region of the reservoir where the ink guide path is formed is such that the ink supply port is formed. The ink flow velocity in the ink guide path, which is shallower than the area where the air bubbles tend to stagnate, is increased.
【０００７】[0007]
【発明の実施の態様】そこで以下に本発明の詳細を図示
した実施例に基づいて説明する。図１、図２、図３は、
本発明の一実施例を示す分解斜視図と、１つのリザ−バ
に接続する圧力発生室近傍の構造を示す断面図であっ
て、図中符号１は、圧力発生ユニットで、圧力発生室を
形成するのに適した厚さ、例えば１５０μｍのジルコニ
ア（ＺｒＯ2）などのセラミックス板に圧力発生室２、
２、２‥‥となる通孔を一定ピッチで穿設してたスペー
サ３と、これの一方の面に厚さ１０μｍ程度のジルコニ
アの薄板からなる弾性変形可能な第１の蓋体４と、圧力
発生室２をノズル開口５及びインク供給口６に接続する
連通孔７、８を備えた第２の蓋体９で封止して構成さ
れ、第１の蓋体４の表面に共通電極１０及び圧力発生室
に対向するようにＰＺＴからなる圧電振動体１１を形成
して、駆動信号により圧力発生室２の容積を膨張、収縮
させるように構成されている。BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing a first embodiment of the present invention. 1, 2, and 3
1 is an exploded perspective view showing an embodiment of the present invention and a cross-sectional view showing a structure in the vicinity of a pressure generating chamber connected to one reservoir. In FIG. The pressure generating chamber 2 is formed on a ceramic plate of zirconia (ZrO 2 ) having a thickness suitable for forming, for example, 150 μm.
A spacer 3 in which through holes of 2, 2 ‥‥ are formed at a constant pitch, and an elastically deformable first lid 4 made of a thin plate of zirconia having a thickness of about 10 μm on one surface thereof; The pressure generating chamber 2 is sealed with a second lid 9 having communication holes 7 and 8 for connecting to the nozzle opening 5 and the ink supply port 6, and a common electrode 10 is formed on the surface of the first lid 4. The piezoelectric vibrator 11 made of PZT is formed so as to face the pressure generating chamber, and the volume of the pressure generating chamber 2 is expanded and contracted by a drive signal.
【０００８】図中符号１２は、流路ユニットで、インク
を２列の圧力発生室に供給できるよう略「Ｕ」字状をな
すリザ−バ１３が、複数、この実施例では３つが一定ピ
ッチで形成され、圧力発生室２の中心側の端部領域で連
通する連通孔１４を備えたリザ−バ形成基板１５を、一
方の面をリザ−バ１３の分岐部１３ａ、１３ａが合流す
る領域１３ｂで連通するインク導入口１６、インク供給
口６、及びノズル連通孔１７が形成されたインク供給口
形成基板１８により、また他方の面をノズル連通孔７、
１７、１４を介して圧力発生室２に連通するノズル開口
５を備えたノズルプレート１９により封止して構成され
ている。In the drawing, reference numeral 12 denotes a flow path unit, which has a plurality of reservoirs 13 having a substantially "U" shape so that ink can be supplied to two rows of pressure generating chambers. In this embodiment, three reservoirs 13 have a constant pitch. And a reservoir forming substrate 15 provided with a communication hole 14 communicating with an end region on the center side of the pressure generating chamber 2 and a region where the branch portions 13a, 13a of the reservoir 13 join one surface. 13b, an ink supply port forming substrate 18 having an ink supply port 16, an ink supply port 6, and a nozzle communication hole 17 formed therein.
It is sealed by a nozzle plate 19 provided with a nozzle opening 5 communicating with the pressure generating chamber 2 via 17 and 14.
【０００９】圧力発生ユニット１を流路形成ユニット１
２の表面に複数、固定することにより、圧力発生室２
は、流路ユニット１２のリザ−バ１３からインクの供給
を受け、また圧力発生室２で加圧されたインクをノズル
連通孔７、１７、１４を介してノズル開口５からインク
滴として吐出する記録ヘッドとして機能する。The pressure generating unit 1 is connected to the flow path forming unit 1
2 is fixed to the surface of the pressure generating chamber 2
Receives ink supplied from the reservoir 13 of the channel unit 12 and discharges the ink pressurized in the pressure generating chamber 2 from the nozzle opening 5 through the nozzle communication holes 7, 17, and 14 as ink droplets. Functions as a recording head.
【００１０】そして、リザ−バ形成基板１５は、インク
導入口１６の近傍の分岐領域の深さｄ１がインク供給口
６と連通する領域の深さｄ２よりも浅くなるように段差
１３ｃが形成されている。また、少なくともインク供給
口６が形成されているリザ−バ本体部の領域は、そのノ
ズルプレート１９と対向する側に凹部１３ｄが形成され
ていて、弾性変形可能に構成されている。なお、図中符
号１３ｅはインク導入口１６に連通する通孔を示す。The reservoir forming substrate 15 is formed with a step 13c so that the depth d1 of the branch area near the ink inlet 16 is smaller than the depth d2 of the area communicating with the ink supply port 6. ing. Further, at least a region of the reservoir main body portion where the ink supply port 6 is formed has a concave portion 13d formed on a side facing the nozzle plate 19, and is configured to be elastically deformable. Reference numeral 13e in the drawing indicates a through hole communicating with the ink introduction port 16.
【００１１】この実施例により、インク導入口１６を流
路により外部のインクカートリッジ等に接続し、ノズル
開口５をキャッピング手段により封止して吸引ポンプか
ら負圧を作用させると、カートリッジのインクがインク
導入口１６、通孔１３ｅからリザ−バ１３に流れ込み、
ここからインク供給口６を経由して圧力発生室２を通過
してノズル開口５からキャッピング手段に排出されて記
録ヘッドにインクの充填が行なわれる。According to this embodiment, when the ink inlet 16 is connected to an external ink cartridge or the like through a flow path, the nozzle opening 5 is sealed by capping means, and a negative pressure is applied from a suction pump, the ink in the cartridge is discharged. The ink flows into the reservoir 13 through the ink inlet 16 and the through hole 13e,
From here, the ink passes through the pressure generating chamber 2 via the ink supply port 6, is discharged from the nozzle opening 5 to the capping means, and the recording head is filled with ink.
【００１２】インク充填の過程で、インク導入口１６近
傍の分岐領域１３ａ、１３ａはその深さｄ１が浅いた
め、ここを大きな流速でインクが流れ、このの気泡等が
リザ−バ１３のインク供給口６と対向する領域に流れ込
む。そして長手方向に分布し、かつ上方に位置するイン
ク供給口６のいずれからか圧力発生室２に流れ込み、イ
ンクと共にキャッピング手段に排出される。In the process of filling the ink, since the depth d1 of the branch areas 13a, 13a near the ink inlet 16 is shallow, the ink flows at a high flow rate there. It flows into the area facing the mouth 6. Then, the ink flows into the pressure generating chamber 2 from one of the ink supply ports 6 which are distributed in the longitudinal direction and located above, and is discharged to the capping means together with the ink.
【００１３】このようにしてインクの充填が終了した段
階で、圧電振動子１１に駆動信号を印加して圧力発生室
２の容積を縮小させると、圧力発生室２のインクが加圧
され、一部がノズル連通孔７、１７、１４を介してノズ
ル開口５に流れ込み、インク滴として吐出する。また一
部のインクはインク供給口６からリザ−バ１３に逆流す
る。この逆流によりリザ−バ１３の圧力が上昇しようと
するが、インク供給口６が形成されている領域のノズル
プレート側が弾性変形して圧力上昇を可及的に吸収し
て、駆動信号が印加されていない圧力発生室２の圧力変
動を防止する。これにより、駆動信号が印加されていな
いノズル開口４から微小なインク滴が吐出するいわゆる
クロストークの発生を防止することができる。When the drive signal is applied to the piezoelectric vibrator 11 to reduce the volume of the pressure generating chamber 2 at the stage when the ink filling is completed, the ink in the pressure generating chamber 2 is pressurized, The part flows into the nozzle opening 5 through the nozzle communication holes 7, 17, and 14, and is ejected as ink droplets. Some ink flows backward from the ink supply port 6 to the reservoir 13. Although the pressure of the reservoir 13 tends to increase due to the backflow, the nozzle plate side of the area where the ink supply port 6 is formed is elastically deformed to absorb the pressure increase as much as possible, and the drive signal is applied. The pressure fluctuation of the pressure generating chamber 2 that is not being prevented is prevented. Thus, the occurrence of so-called crosstalk in which minute ink droplets are ejected from the nozzle openings 4 to which no drive signal is applied can be prevented.
【００１４】なお、このようなリザ−バ形成基板１４
は、単一の金属板１５ａ，１５ｂの両面をエッチング加
工したり、またプレス加工して凹部や通孔を形成し、積
層することにより構成することができる。Incidentally, such a reservoir forming substrate 14
Can be formed by etching both surfaces of the single metal plates 15a and 15b, or pressing and forming concave portions and through holes and laminating them.
【００１５】[0015]
【発明の効果】以上説明したように本発明においては、
リザ−バのインク誘導口が形成されている領域を、イン
ク供給口が形成されている領域の深さよりも浅く形成し
て、インク流速を高めたので、リザ−バ内の気泡を速や
かに排除することができ、またリザ−バの拡大が可能と
なり、十分なコンプライアンスを確保することができ
る。As described above, in the present invention,
The region where the ink guide port of the reservoir is formed is formed shallower than the depth of the region where the ink supply port is formed, and the ink flow rate is increased, so that bubbles in the reservoir are quickly eliminated. And the reservoir can be expanded, and sufficient compliance can be ensured.
【図１】本発明の一実施例を示す分解斜視図である。FIG. 1 is an exploded perspective view showing one embodiment of the present invention.
【図２】図（イ）、（ロ）は、それぞれ本発明のインク
ジェット式記録ヘッドの一実施例を、Ａ−Ａ線、及びＢ
−Ｂ線での断面構造で示す図である。FIGS. 2A and 2B show an embodiment of an ink jet recording head according to the present invention, taken along lines AA and B, respectively.
It is a figure shown by the sectional structure in the -B line.
【図３】インクジェット式記録ヘッドのリザ−バとイン
ク導入口との位置関係を示す図である。FIG. 3 is a diagram showing a positional relationship between a reservoir and an ink inlet of an ink jet recording head.
１ 圧力発生ユニット ２ 圧力発生室 ３ スペーサ ４ 第１の蓋体 ５ ノズル開口 ６ インク供給口 ７、８ 連通孔 ９ 第２の蓋体 １１ 圧電振動子 １２ 流路ユニット １３ リザ−バ １３ａ、１３ａ 分岐部 １３ｃ 段差 １３ｄ 凹部 １５ リザ−バ形成基板 １６ インク導入口 １９ ノズルプレート REFERENCE SIGNS LIST 1 pressure generating unit 2 pressure generating chamber 3 spacer 4 first lid 5 nozzle opening 6 ink supply port 7, 8 communication hole 9 second lid 11 piezoelectric vibrator 12 channel unit 13 reservoir 13a, 13a branch Part 13c step 13d recess 15 reservoir forming substrate 16 ink inlet 19 nozzle plate
Claims (3)
力発生室にインクを供給するインク供給口、該インク供
給口を介して前記圧力発生室に連通し、インク導入口と
誘導路で接続されたリザ−バを備えたインクジェット式
記録ヘッドにおいて、 前記リザ−バの前記インク誘導路が形成されている領域
の深さが、前記インク供給口が形成されている領域より
も浅いことを特徴とするインクジェット式記録ヘッド。1. A pressure generating chamber having a pressure generating member, an ink supply port for supplying ink to the pressure generating chamber, communicating with the pressure generating chamber via the ink supply port, and connected to an ink introduction port by a guide path. In the ink jet recording head provided with the reservoir, a depth of a region where the ink guide path of the reservoir is formed is smaller than a region where the ink supply port is formed. Inkjet recording head.
成する弾性板、 前記弾性板により一方の面が封止されて圧力発生室を形
成するスペーサ、 該スペーサの他方を封止するとともに、前記圧力発生室
の両端部において連通する連通孔を備えた蓋部材、 前記圧力発生室へのインク供給路に流路抵抗を付与する
インク供給口、前記圧力発生室と連通する連通孔、及び
外部のインク容器に連通するインク誘導口とを備えたイ
ンク供給口形成基板、 前記インク供給口を介して前記各圧力発生室に連通する
リザ−バ、及び前記圧力発生室に連通する連通孔とを備
えたリザ−バ形成板、 前記リザ−バ形成板の他面を封止するとともに前記各連
通孔を介して前記圧力発生室に接続するノズル開口を備
えたノズルプレート、 とをそれぞれ順番に積層して一体に成形してなるインク
ジェット式記録ヘッドにおいて、 前記リザ−バのインク誘導口が形成されている領域が、
前記インク供給口が形成されている領域の深さよりも浅
く形成されているインクジェット式記録ヘッド。2. An elastic plate having a piezoelectric vibrating plate on its surface to form a vibrating member, a spacer having one surface sealed by the elastic plate to form a pressure generating chamber, and sealing the other of the spacer. A lid member having communication holes communicating with both ends of the pressure generation chamber, an ink supply port for providing a flow path resistance to an ink supply path to the pressure generation chamber, a communication hole communicating with the pressure generation chamber, An ink supply port forming substrate having an ink guide port communicating with an external ink container; a reservoir communicating with each of the pressure generation chambers via the ink supply port; and a communication hole communicating with the pressure generation chamber. A nozzle plate having a nozzle opening for sealing the other surface of the reservoir forming plate and connecting to the pressure generating chamber through each of the communication holes, respectively. Laminated on one In an ink jet recording head formed into a body, an area where an ink guide port of the reservoir is formed,
An ink jet recording head formed shallower than a depth of a region where the ink supply port is formed.
口が形成されている領域の、前記ノズルプレート側が、
インク滴吐出時の前記圧力発生室から逆流したインクの
圧力により弾性変形可能に構成されている請求項２に記
載のインクジェット式記録ヘッド。3. The nozzle plate side of a region where the ink supply port of the reservoir forming substrate is formed,
3. The ink jet recording head according to claim 2, wherein the ink jet recording head is configured to be elastically deformable by the pressure of the ink flowing backward from the pressure generating chamber at the time of discharging the ink droplet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11763097A JP3634555B2 (en) | 1997-04-21 | 1997-04-21 | Inkjet recording head |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11763097A JP3634555B2 (en) | 1997-04-21 | 1997-04-21 | Inkjet recording head |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH10291313A true JPH10291313A (en) | 1998-11-04 |
| JP3634555B2 JP3634555B2 (en) | 2005-03-30 |
Family
ID=14716483
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11763097A Expired - Fee Related JP3634555B2 (en) | 1997-04-21 | 1997-04-21 | Inkjet recording head |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3634555B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006198812A (en) * | 2005-01-18 | 2006-08-03 | Brother Ind Ltd | Image recorder |
| JP2007090520A (en) * | 2005-09-26 | 2007-04-12 | Fuji Xerox Co Ltd | Liquid droplet delivering head and liquid droplet delivering apparatus |
| CN104149490A (en) * | 2013-05-13 | 2014-11-19 | 佳能株式会社 | Liquid ejection apparatus and liquid ejection head |
-
1997
- 1997-04-21 JP JP11763097A patent/JP3634555B2/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006198812A (en) * | 2005-01-18 | 2006-08-03 | Brother Ind Ltd | Image recorder |
| JP2007090520A (en) * | 2005-09-26 | 2007-04-12 | Fuji Xerox Co Ltd | Liquid droplet delivering head and liquid droplet delivering apparatus |
| CN104149490A (en) * | 2013-05-13 | 2014-11-19 | 佳能株式会社 | Liquid ejection apparatus and liquid ejection head |
| CN104149490B (en) * | 2013-05-13 | 2016-05-25 | 佳能株式会社 | Liquid discharge apparatus and fluid ejection head |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3634555B2 (en) | 2005-03-30 |
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