JPS58114963A - Ink jet head - Google Patents

Ink jet head

Info

Publication number
JPS58114963A
JPS58114963A JP21289481A JP21289481A JPS58114963A JP S58114963 A JPS58114963 A JP S58114963A JP 21289481 A JP21289481 A JP 21289481A JP 21289481 A JP21289481 A JP 21289481A JP S58114963 A JPS58114963 A JP S58114963A
Authority
JP
Japan
Prior art keywords
air supply
ink droplets
jet nozzles
air
nozzles
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
JP21289481A
Other languages
Japanese (ja)
Inventor
Tamotsu Kojima
保 小島
Seiji Yamamori
山森 清司
Kenji Akami
研二 赤見
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.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial 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 Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP21289481A priority Critical patent/JPS58114963A/en
Publication of JPS58114963A publication Critical patent/JPS58114963A/en
Pending 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
    • B41J2/14298Structure of print heads with piezoelectric elements of disc type
    • 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
    • B41J2202/00Embodiments of or processes related to ink-jet or thermal heads
    • B41J2202/01Embodiments of or processes related to ink-jet heads
    • B41J2202/02Air-assisted ejection

Landscapes

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

Abstract

PURPOSE:To provide an ink jet head capable of recording images of good quality at a high density with uniform ink droplets by a method wherein the head is equipped with plural pieces of jet nozzles for spouting ink droplets, an air supply layer provided in front of nozzles and an air supply groove interconnected thereto. CONSTITUTION:An air supply layer 22 is provided in front of plural pieces of jet nozzles 21, 21'... so as to cover all of them and a common air supply groove 23 is provided around the air supply layer 22. Air current is uniformly sent to jet nozzles 21, 21'... from their surroundings and ink droplets are discharged from an opening 24. Since there is no air supply groove between jet nozzles 21, 21'... unlike a conventional one, jet nozzles 21, 21'... can be provided very close to each other and high density recording becomes possible. By properly selecting the size of the air supply groove 23, jet nozzles 21, 21'... can obtain an air current of exactly the same intensity. Due to this, ink droplets become uniform even if the number of jet nozzle is large.

Description

【発明の詳細な説明】 本発明は、インクジェット記録に用いられるインクジェ
ットヘッドに関する。
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an inkjet head used for inkjet recording.

インクジェット記録方式には種々の方式があるが、記録
紙に加工処理することなく普通紙が用いられること、タ
イプライタのような機械式による方式と異なり無騒音で
あること、インクの補給のみで記録の長寿命などの長所
があり、なによシも長所はカラー化が安価に出来る可能
性が大であることである。
There are various inkjet recording methods, but the following are the advantages: plain paper is used without any processing, it is noiseless unlike mechanical methods such as typewriters, and it can record only by replenishing ink. It has advantages such as long lifespan, and the most important advantage is that there is a great possibility that colorization can be done at low cost.

このような長所を生かせる方式として、特開昭48−9
622号公報に詳述されているステムメ氏の提案したイ
ンクジェット記録装置は、極めて有効な装置である。
As a method that can take advantage of these advantages, Japanese Patent Application Laid-Open No. 48-9
The inkjet recording device proposed by Mr. Stemme, which is detailed in Publication No. 622, is an extremely effective device.

本発明の特徴を理解しやすくするために、まず第1図に
より特開昭48−9622号公報に記載の発明を説明す
る。この発明のインクジェットヘッドは、インクジェッ
トヘッド1を2分割したインク液室、即ち%1つの外方
の室2と1つの内方の室3とを有し、これらの画室は結
合通路4により互に結合している。金属ダイヤフラム6
は内方の室3の壁3′にとりつけられている。インク流
入通路6は外方の室2内へ開口しており、また結合通路
4に直接向き合って噴射ノズル7が設けられている。
In order to make it easier to understand the features of the present invention, the invention described in Japanese Patent Application Laid-Open No. 48-9622 will first be explained with reference to FIG. The inkjet head of the present invention has an ink liquid chamber divided into two inkjet head 1, that is, one outer chamber 2 and one inner chamber 3, and these chambers are connected to each other by a connecting passage 4. are combined. metal diaphragm 6
is attached to the wall 3' of the inner chamber 3. The ink inlet channel 6 opens into the outer chamber 2 and an injection nozzle 7 is provided directly opposite the coupling channel 4 .

上記のインクジェットヘッドのインク粒子吐出周波数は
、高々数曲ぐらいまでであり、6匹から10凸ぐらいは
インク粒子を吐出するが、不安定な領域である。これは
、金属ダイヤフラム6と結合されるピエゾ素子への電気
インパルスの周波数を高くしていくにつれ、インクが電
気インパルス3 に追従しなくなる事態が生じるためであり、このことは
外部から電・気信号(電気インパルス)に応じた記録を
行なう場合に不都合を生ずる。
The ink droplet ejection frequency of the above-mentioned inkjet head is up to several songs at most, and ink particles are ejected at about 6 to 10 convexes, but this is an unstable range. This is because as the frequency of the electrical impulse to the piezo element coupled to the metal diaphragm 6 increases, a situation occurs where the ink no longer follows the electrical impulse 3. This causes inconvenience when recording in accordance with (electrical impulse).

このような点を解決したインクジェットヘッドとして、
第2図a、bに示すような輔気流を用いるものがある。
As an inkjet head that solves these problems,
There is one that uses a stream of air as shown in FIGS. 2a and 2b.

第2図aはこのインクジェットヘッドの側断面図、第2
図すはそのムーA断面図である。インクジェットヘッド
8のインク噴射ノズル9を覆って、インク噴射ノズル9
に対向して開口部10が設けられている。圧力空気源(
図示せず)からの空気は、一方はインク溜11に流し。
Figure 2a is a side sectional view of this inkjet head,
The figure is a sectional view of Moo A. Covering the ink jet nozzle 9 of the inkjet head 8, the ink jet nozzle 9
An opening 10 is provided opposite to. Pressure air source (
(not shown) flows into the ink reservoir 11 on one side.

他方は空気導入パイプ12.空気供給通路13゜空気供
給層14を径て開口部10から空気流を流出させる。こ
の空気流によってインク液滴飛翔速度は増し、飛翔方向
の安定性向上、インク液滴の噴射も容易となり、数十曲
の電気インクパルスに追従するインク液滴の安定した噴
、射が可能となる。
The other is an air introduction pipe 12. Air supply passage 13 degrees through air supply layer 14 to allow air to flow out of opening 10 . This airflow increases the flying speed of the ink droplets, improves the stability of the flying direction, and makes it easier to eject the ink droplets, making it possible to stably eject and eject ink droplets that follow dozens of electric ink pulses. Become.

インク液滴のインク粒もより均一の大きさのものが得ら
れるようになシ、記録画像の鮮明さも一段と向上する。
The ink droplets of the ink droplets also have a more uniform size, and the clarity of the recorded image is further improved.

また、インク噴射ノズル9近辺のイ記録する場合に1回
転によって誘起される風の影響によってインク液滴飛翔
への悪影響もなくなる。
In addition, the adverse effect on the flight of ink droplets due to the influence of the wind induced by one revolution when recording in the vicinity of the ink jet nozzle 9 is eliminated.

以上のような特長を有するインクジェットヘッドにおい
て、空気流の効果全高めるには、第2図すに示すように
空気供給溝15を空気供給層14の周囲に設けるとよい
。空気供給溝16は、空気供給層14に空気流を均一に
送る効果が、あり1例えば空気供給層“14の厚さが2
0〜1ooμのとき。
In the inkjet head having the above features, in order to fully enhance the effect of airflow, it is preferable to provide air supply grooves 15 around the air supply layer 14 as shown in FIG. The air supply groove 16 has the effect of uniformly sending an air flow to the air supply layer 14. For example, if the thickness of the air supply layer 14 is 2.
When 0 to 1ooμ.

空気供給溝15は、゛幅PがI MM 、深さQが0.
5−2MMとなる。
The air supply groove 15 has a width P of I MM and a depth Q of 0.
It becomes 5-2MM.

このような特長を有するインクジェットヘッドを複数個
用いたものを第3図a、bに示す。第3図aはインクジ
ェットヘッドの断面図を示し、第3図すはそのBB断面
図である。噴射ノズル16゜16′、・・・・・・のそ
れぞれには、各々対向する開口部17.17’、・・・
・・・、空気導入パイプ18.18’。
An inkjet head using a plurality of inkjet heads having such features is shown in FIGS. 3a and 3b. FIG. 3a shows a sectional view of the inkjet head, and FIG. 3 is a BB sectional view thereof. Each of the injection nozzles 16° 16', . . . has an opening 17, 17', .
..., air introduction pipe 18.18'.

・・・・・・、空気供給層19.19’、・・・・・・
、空気供給溝20.20’、・・・・・・が設けられて
いる。各々の空気導入パイプ18.18’、・・・・・
・には、圧力空気源(図示せず)から圧力空気が供給さ
れている。このような複数個のインクジェットヘッドが
各々独立に空気供給溝20.20’、・・・・・・を有
する場合も。
......, air supply layer 19.19', ...
, air supply grooves 20, 20', . . . are provided. Each air inlet pipe 18.18',...
- is supplied with pressurized air from a pressurized air source (not shown). A plurality of such inkjet heads may each independently have air supply grooves 20, 20', . . . .

空気流の効果は期待できる。ところが、噴射ノズル16
.16’、・・・・・・間の空気供給溝20.20’。
The effect of airflow can be expected. However, the injection nozzle 16
.. Air supply grooves 20, 20' between 16', .

・・・・・・の存在のために、噴射ノズル16.16’
、・・・・・・間の間隔Wを短くできない欠点を有して
いた。
Due to the presence of..., the injection nozzle 16.16'
, . . . had the disadvantage that the interval W between them could not be shortened.

このために、複数個の噴射ノズル16.16’、・・・
・・・ヲ用いたインクジェットヘッドにおいて空気流を
用いるとき、噴射ノズル16.16’、・・・・・・の
間隔が短くならず、ノズルの高密度化の障害となってい
た。以上の問題は、上記の構造に限らず、空気流を用い
たインクジェットヘッドに共通した問題であった。
For this purpose, a plurality of injection nozzles 16, 16', .
When an air flow is used in an inkjet head using . . . , the distance between the ejection nozzles 16, 16', . The above problem is not limited to the above structure, but is a problem common to inkjet heads using air flow.

本発明は1以上に述べた欠点を解決するためになされた
ものであって、以下に本発明の一実施例を図面を用いて
説明する。
The present invention has been made to solve the above-mentioned drawbacks, and one embodiment of the present invention will be described below with reference to the drawings.

第4図aは本発明の一実施例を示すインクジェットヘッ
ドの側断面図を示し、第4図すは同実施例のCC断面図
を示す。複数個の噴射ノズル21゜21′、・・・・・
・の全前面にわたって空気供給層22が設けられ、空気
供給層22の周囲に共通の空気供給溝23(深さQ)が
設けられており、複数個の噴射ノズル21.21’、・
・・・・・は周囲から空気流を均一に送られ、インク液
滴は開口部24から吐出される。従来と異なシ、噴射ノ
ズル21.21’。
FIG. 4a shows a side sectional view of an inkjet head showing an embodiment of the present invention, and FIG. 4A shows a CC sectional view of the same embodiment. Multiple injection nozzles 21°21',...
An air supply layer 22 is provided over the entire front surface of the air supply layer 22, a common air supply groove 23 (depth Q) is provided around the air supply layer 22, and a plurality of injection nozzles 21, 21',
. . . is uniformly supplied with airflow from the surroundings, and ink droplets are ejected from the opening 24. The injection nozzle 21.21' is different from the conventional one.

・・・・・・間には空気供給溝が存在しないので、噴射
ノズル21.21’、・・・・・・間の間隔Wは極めて
近接して°設けることができ、高密度記録が可能となる
Since there is no air supply groove between the injection nozzles 21, 21', . . ., the distance W between the injection nozzles 21, 21', . becomes.

空気供給溝23内での空気流の圧力降下は発生しない程
度に、空気供給溝23の大きさを選定しており、噴射ノ
ズル21.21’、・・・・・・の個数が極めて多い場
合においても各々の噴射ノズル21.21’。
When the size of the air supply groove 23 is selected to such an extent that no pressure drop in the air flow occurs within the air supply groove 23, and the number of injection nozzles 21, 21', . . . is extremely large. Also each injection nozzle 21.21'.

・・・・・・に到達する空気流、は全く同等のものが得
られる。このような特長を有するため、各噴射ノズル2
1.21’、・・・・・・から噴射するインク液滴も均
一なものが得られ、記録画像も極めて良好なものが得ら
れる。また、このような共通の空気供給溝23を設ける
ために、噴射ノズル21.21’、・・・・・・に付着
した異物除去や空気供給層内の清掃が非常に7 / 容易となる。また、空気導入バイブ26も各噴射ノズル
21.21’、・・・・・・に1個ずつ設ける必要もな
く、空気導入バイブ26の数も少なくて済み。
The air flow reaching ... is exactly the same. Because of these features, each injection nozzle 2
1.21', . . . uniform ink droplets are obtained, and extremely good recorded images are obtained. Further, since such a common air supply groove 23 is provided, it becomes very easy to remove foreign substances attached to the injection nozzles 21, 21', . . . and to clean the inside of the air supply layer. Further, there is no need to provide one air introduction vibrator 26 for each injection nozzle 21, 21', . . . , and the number of air introduction vibes 26 can be reduced.

圧力空気源からの配管の処理も簡単となる。It also simplifies the handling of piping from the pressurized air source.

第6図aは本発明の他の実施例を示す側断面図であり、
第5図すは同実施例のDD断面図である。
FIG. 6a is a side sectional view showing another embodiment of the present invention,
FIG. 5 is a DD sectional view of the same embodiment.

噴射ノズル21.21’、・・・・・−をはさんで両側
に空気供給溝23を設けた構造である。本実施例におい
ても、噴射ノズル21.21’、・・・・・・の個数が
極めで多い場合でも、空気供給溝23内の空気圧は場所
によらず一定となり、噴射ノズル21.21’。
It has a structure in which air supply grooves 23 are provided on both sides of the injection nozzles 21, 21', . . . -. In this embodiment as well, even if the number of injection nozzles 21.21', . . . is extremely large, the air pressure in the air supply groove 23 remains constant regardless of the location.

・・・・・・から噴射するインク液滴径も均一なものが
得られる。また、空気供給層22内の清掃や圧力空気源
からの配管の処理も同様に簡単となる。
The diameter of the ink droplets ejected from . . . can also be uniform. Further, cleaning inside the air supply layer 22 and processing of piping from the pressurized air source are similarly simplified.

なお、本発明は上記各実施例の構造に限らず。Note that the present invention is not limited to the structure of each of the above embodiments.

複数個の噴射ノズルを有するインクジェットヘッドであ
って、空気流を用いるものならば、同様な効果が期待で
きることは言うまでもない。
It goes without saying that similar effects can be expected if the inkjet head has a plurality of ejection nozzles and uses airflow.

以上のように、本発明によるインクジェットヘッドは5
インク液滴を噴射する複数個の噴射ノズルの全前面に、
空気溜となる空気供給溝を有した空気供給層を設けられ
ているため、噴射ノズルの個数が極めて多い場合におい
ても高密度化が可能となシ、また各々の噴射ノズルから
のインク液滴も均一となり、記録画像も極めて良好なも
のが得られる。また、圧力空気源からの配管の処理、空
気供給層内の清掃等のメインテナンスの面でも非常に便
利となる。
As described above, the inkjet head according to the present invention has five
On the entire front surface of multiple jetting nozzles that jet ink droplets,
Since an air supply layer is provided with air supply grooves that serve as air reservoirs, it is possible to achieve high density even when the number of ejection nozzles is extremely large, and the ink droplets from each ejection nozzle are also reduced. It becomes uniform and a very good recorded image can be obtained. It is also very convenient in terms of maintenance, such as processing piping from the pressure air source and cleaning the inside of the air supply layer.

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

第1図、第2図a、b、第3図a、bは従来のインクジ
ェットヘッドの断面図、第4図a、bおよび第6図a、
bは本発明の一実施例におけるインクジェットヘッドを
示す断面図である。 21.21’・・・・・・噴射ノズル、22・・・・・
・空気供給層、23・・・・・・空気供給溝、24・・
・・・・開口部、26・・・・・・空気導入バイブ。 代理人の氏名 弁理士 中 尾 敏 男 ほか1名第4
図 第5図
1, 2 a, b, 3 a, b are sectional views of conventional inkjet heads, FIGS. 4 a, b, 6 a,
b is a sectional view showing an inkjet head in one embodiment of the present invention. 21.21'...Injection nozzle, 22...
・Air supply layer, 23...Air supply groove, 24...
...Opening, 26...Air introduction vibe. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 4
Figure 5

Claims (1)

【特許請求の範囲】[Claims] インク液滴を噴射する複数個の噴射ノズルと、前記噴射
ノズルのすべての前面にわたって設けられた空気供給層
と、前記空気供給層と連通ずる空気供給溝とを具備した
ことを特徴とするインク、ジェットヘッド0
An ink comprising: a plurality of ejection nozzles that eject ink droplets; an air supply layer provided over all front surfaces of the ejection nozzles; and an air supply groove communicating with the air supply layer. jet head 0
JP21289481A 1981-12-28 1981-12-28 Ink jet head Pending JPS58114963A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP21289481A JPS58114963A (en) 1981-12-28 1981-12-28 Ink jet head

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP21289481A JPS58114963A (en) 1981-12-28 1981-12-28 Ink jet head

Publications (1)

Publication Number Publication Date
JPS58114963A true JPS58114963A (en) 1983-07-08

Family

ID=16630020

Family Applications (1)

Application Number Title Priority Date Filing Date
JP21289481A Pending JPS58114963A (en) 1981-12-28 1981-12-28 Ink jet head

Country Status (1)

Country Link
JP (1) JPS58114963A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6285952A (en) * 1985-10-11 1987-04-20 Matsushita Electric Ind Co Ltd Ink jet recording head
JPH0211333A (en) * 1988-04-29 1990-01-16 Am Internatl Inc Demand droplet printing head

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5450331A (en) * 1977-09-29 1979-04-20 Fuji Xerox Co Ltd Apparatus for jetting ink liquid droplets
JPS5492729A (en) * 1977-12-30 1979-07-23 Toray Industries Ink jetting type recording apparatus
JPS5569477A (en) * 1978-11-21 1980-05-26 Seiko Epson Corp Ink jet recording device
JPS55146774A (en) * 1979-05-04 1980-11-15 Nec Corp Ink-jet recording device

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5450331A (en) * 1977-09-29 1979-04-20 Fuji Xerox Co Ltd Apparatus for jetting ink liquid droplets
JPS5492729A (en) * 1977-12-30 1979-07-23 Toray Industries Ink jetting type recording apparatus
JPS5569477A (en) * 1978-11-21 1980-05-26 Seiko Epson Corp Ink jet recording device
JPS55146774A (en) * 1979-05-04 1980-11-15 Nec Corp Ink-jet recording device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6285952A (en) * 1985-10-11 1987-04-20 Matsushita Electric Ind Co Ltd Ink jet recording head
JPH0211333A (en) * 1988-04-29 1990-01-16 Am Internatl Inc Demand droplet printing head

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