JPS6174848A - inkjet recording device - Google Patents
inkjet recording deviceInfo
- Publication number
- JPS6174848A JPS6174848A JP59197155A JP19715584A JPS6174848A JP S6174848 A JPS6174848 A JP S6174848A JP 59197155 A JP59197155 A JP 59197155A JP 19715584 A JP19715584 A JP 19715584A JP S6174848 A JPS6174848 A JP S6174848A
- Authority
- JP
- Japan
- Prior art keywords
- air
- ink
- discharge port
- inkjet recording
- air discharge
- 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
- B41J2/015—Ink jet characterised by the jet generation process
- B41J2/04—Ink jet characterised by the jet generation process generating single droplets or particles on demand
- B41J2/06—Ink jet characterised by the jet generation process generating single droplets or particles on demand by electric or magnetic field
-
- 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
- B41J2202/00—Embodiments of or processes related to ink-jet or thermal heads
- B41J2202/01—Embodiments of or processes related to ink-jet heads
- B41J2202/02—Air-assisted ejection
Landscapes
- Particle Formation And Scattering Control In Inkjet Printers (AREA)
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
【発明の詳細な説明】
産業上の利用分野
本発明は空気流を用いたイックジェット記録装置に関す
る。DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an icjet recording device using an air stream.
逆来例の構成とその問題点
空気流を用いたインクジェット記録装置には鍾々のもの
が提案されているが、ここでは、空気流を用いたインク
ジェット記録装置として、空気流と静電力を利用したイ
ンクジェット記録装置を列にとり説明する。Retroconventional configuration and its problems A number of inkjet recording devices that use airflow have been proposed, but here we will introduce an inkjet recording device that uses airflow and electrostatic force. A series of inkjet recording apparatuses will be explained below.
第１図は、本出願人の先行出願に係る空気流と静電力を
利用したインクジェット記録装置を示す。FIG. 1 shows an inkjet recording device using air flow and electrostatic force according to an earlier application by the present applicant.
絶縁性の空気ノズル板２には空気吐出口１が穿孔されて
おり、ノズル板２と平行して導電性のインクノズル板３
が配置されており、かつ前記インクノズル板３には空気
吐出口１に対向してインク吐出口４が穿孔されている。An insulating air nozzle plate 2 is provided with air discharge ports 1, and a conductive ink nozzle plate 3 is provided in parallel with the nozzle plate 2.
are arranged, and the ink nozzle plate 3 has an ink discharge port 4 perforated opposite to the air discharge port 1 .
空気供給路８には、空気供給源２ｏより空気流が流入し
、環状構造の空気室９において均一化され、前記空気ノ
ズル板２とインクノズル板３とにより生じる空気層７の
周辺より流入し、空気吐出口１より流出している。この
空気流は空気吐出口１の近傍で急激に変化しているため
、インク吐出口４より空気吐出口１に至る空間には急激
な圧力勾配の変化が生じている。Air flows into the air supply path 8 from the air supply source 2o, is made uniform in the annular air chamber 9, and flows from around the air layer 7 created by the air nozzle plate 2 and the ink nozzle plate 3. , is flowing out from the air outlet 1. Since this air flow changes rapidly near the air outlet 1, a rapid change in pressure gradient occurs in the space from the ink outlet 4 to the air outlet 1.
一方、インク吐出口４に隣接したインク室１０はインク
溜り１１とインク供給路６を介して連通しており、前記
インク溜り１１内のインクは、空気供給源２０よりの空
気圧力によって、圧力調整機構２１により調整された一
定圧力が印加されている。これは、インクジェット記録
装置の非駆動時に、イック吐出口４の近θ７の空気圧力
とインク吐出口４あるいはインク室１０のインク圧力が
ほぼ等しくインク吐出口４内のインクのメニスカスが静
止して保たれるように調整するためである。On the other hand, an ink chamber 10 adjacent to the ink discharge port 4 communicates with an ink reservoir 11 via an ink supply path 6, and the pressure of the ink in the ink reservoir 11 is adjusted by air pressure from an air supply source 20. A constant pressure regulated by mechanism 21 is applied. This is because when the inkjet recording device is not driven, the air pressure near θ7 of the ink ejection port 4 and the ink pressure in the ink ejection port 4 or the ink chamber 10 are approximately equal, and the meniscus of ink in the ink ejection port 4 is kept stationary. This is to adjust it so that it sag.
信号源５は空気吐出口１の周辺に設けられた電）＠１２
．ｇインクノズル仮３に接続されており、電Ｊｆｘ １
２とインク吐出口４０間に電位差が生じさせらＦｌ−る
、この電位差による静電力によってインク吐出口４に生
じるインクのメニスカスが空気吐出口１の方向に引き伸
ばされる。さらに、インク吐出口４がら空気吐出口１に
至る空間には急激な圧力勾配の変化が生じているため、
インク吐出口４に生じるインクのメニスカスは一定長さ
以上引き伸ばされると前記圧力勾配の変化により加速さ
れ空気吐出口１より飛翔する。正常な吐出を行なってい
る場合の空気吐出口１付近の拡大図を第２図に示す。１
４はインク液滴である。一方、空気流を用いたヘッドで
は、空気吐出口１の形状あるいは空気層７の厚さの不均
一さによって空気の吐出方向が大幅に変化し易い欠点を
有している。さらに第３図に示すごとく、空気吐出口１
とイック吐出口４の位置がずれ、同心円上に位置しない
場合には、インク吐出口４で形成されるインクメニスカ
スの先端部がインク吐出口４の中心よりずれ、かつ前記
先端部よりインクｉ滴１４が斜め方向に飛翔するために
、空気吐出口１の内す、（に衝突しミスト状となって記
録紙上に付着する。従って、画質の著しい低下を招く結
果となる。空気吐出口１の内壁への衝突を避けるだめに
は、空気吐出口１の径を大きくすればよいが、それでは
、０答性の低下、サテライトドロップの増加といった記
録特性の低下を招く。すなわちインク吐出口４の径とほ
ぼ同等かやや大きい最適な径が存在し、従って空気吐出
口１の径を拡大することはできない。The signal source 5 is a signal provided around the air outlet 1) @12
．． g It is connected to the ink nozzle temporary 3, and the electric Jfx 1
A potential difference is generated between Fl-2 and the ink discharge port 40, and the meniscus of ink produced at the ink discharge port 4 is stretched in the direction of the air discharge port 1 due to the electrostatic force caused by this potential difference. Furthermore, since there is a sudden change in pressure gradient in the space from the ink discharge port 4 to the air discharge port 1,
When the ink meniscus generated at the ink discharge port 4 is stretched beyond a certain length, it is accelerated by the change in the pressure gradient and flies out of the air discharge port 1. FIG. 2 shows an enlarged view of the vicinity of the air discharge port 1 when normal discharge is performed. 1
4 is an ink droplet. On the other hand, heads using air flow have the disadvantage that the direction of air discharge tends to change significantly due to non-uniformity in the shape of the air discharge port 1 or the thickness of the air layer 7. Further, as shown in Fig. 3, air discharge port 1
If the position of the ink ejection port 4 deviates and is not located on a concentric circle, the tip of the ink meniscus formed by the ink ejection port 4 will be deviated from the center of the ink ejection port 4, and the ink i droplet will be 14 flies in an oblique direction, it collides with the inside of the air outlet 1 and becomes mist and adheres to the recording paper. This results in a significant deterioration in image quality. In order to avoid collision with the inner wall, the diameter of the air outlet 1 can be increased, but this will result in deterioration of recording characteristics such as a decrease in zero response and an increase in satellite drops. There is an optimum diameter that is approximately equal to or slightly larger than , and therefore the diameter of the air discharge port 1 cannot be increased.
発明の目的
本発明は、空気流を用いたインクジェットヘッドで、イ
ンク吐出口より飛翔したインクが、空気吐出口へ衝突す
るのを阻止し、安定した記録および高品位の画質を得る
ことを目的とする。Purpose of the Invention The purpose of the present invention is to prevent ink flying from an ink ejection port from colliding with the air ejection port in an inkjet head using an air flow, thereby obtaining stable recording and high image quality. do.
発明の構成
本発明は空気流を流出させる空気吐出口と、この空気吐
出口に対向して開口を有し空気流中にインク液滴を吐出
させるインク吐出口とを有し、空気吐出口の形状がその
吐出方向に拡大していることを特徴とする。Structure of the Invention The present invention has an air discharge port for discharging an air flow, and an ink discharge port having an opening opposite to the air discharge port for discharging ink droplets into the air flow. It is characterized by its shape expanding in the discharge direction.
実施例の説明
以下本発明の実施例について図面とともに詳細に説明す
る。第４図は本発明の実施例を示す。図中、第２図また
は第３図と同一部分には同一符号を付して説明を省略す
る。DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 4 shows an embodiment of the invention. In the figure, the same parts as in FIG. 2 or 3 are given the same reference numerals, and their explanation will be omitted.
空気ノズル板２に形成された空気吐出口１ば、空気の吐
出方向に開いた円錐台状をしている。この構造では、空
気吐出方向が、空気層７の不均一さ等のなんらかの要因
で多少変化しても、空気吐出口１の縁部のＡ部に空気流
速０の領域が形成される。従って空気吐出口１とイ／り
吐出口４の位置ずれが生じ、インク液滴１４の飛翔方向
が変化しても空気流内を飛翔するため、極めて大きいエ
ネルギが、インク液滴１４に作用しない限り、空気流速
○のＡ部領域に飛び出すことはない。従って、空気吐出
口１の内壁にインク液滴１４が衝突することもなく安定
した記録が可能となる。The air discharge port 1 formed in the air nozzle plate 2 has a truncated conical shape that opens in the air discharge direction. In this structure, even if the air discharge direction changes somewhat due to some factor such as non-uniformity of the air layer 7, a region where the air flow velocity is 0 is formed at the portion A of the edge of the air discharge port 1. Therefore, a positional shift occurs between the air discharge port 1 and the air discharge port 4, and even if the flying direction of the ink droplet 14 changes, the ink droplet 14 flies within the air flow, so that extremely large energy does not act on the ink droplet 14. As long as the air flow rate is ○, it will not fly out into the area A. Therefore, stable recording is possible without the ink droplets 14 colliding with the inner wall of the air discharge port 1.
空気吐出口１の形状は、円錐台状に限らず、空気吐出方
向に拡がった形状であれば同等の効果が得られる。The shape of the air discharge port 1 is not limited to a truncated cone shape, but the same effect can be obtained as long as the shape expands in the air discharge direction.
なお、本発明は空気流と静電力を利用したタイプのイン
クジェット記録装置に限らず、空気流を使用するその他
のタイプのインクンエツト記録装置にも使用できる。Note that the present invention is not limited to inkjet recording devices that utilize airflow and electrostatic force, but can also be used in other types of inkjet recording devices that use airflow.
発明の効果
以上のように、本発明は空気流を使用するインクジェッ
ト記録装置の空気吐出口の形状を空気の流出方向に向っ
て拡大した構成としたインクジェット記録装置で、以下
の効果がある。Effects of the Invention As described above, the present invention is an inkjet recording apparatus that uses an air flow, in which the shape of the air discharge port is expanded in the direction of air outflow, and the present invention has the following effects.
（１）空気吐出口にインク液滴が衝突するのを防止でき
、安定した画質の記録が得られる。(1) It is possible to prevent ink droplets from colliding with the air discharge ports, and recording with stable image quality can be obtained.
（２）空気吐出口とインク吐出口の位置合せの許容誤差
範囲が拡がり、ヘッド製造が容易になる。(2) The permissible error range for alignment between the air discharge port and the ink discharge port is widened, and head manufacturing becomes easier.
第１図は本出願人の先行出願に係るイ／クジェノド記録
装置の構成を示す一部断面図、第２図は第１図に示した
イノクジエツトヘッドの空気吐出口付近を拡大した断面
図、第３図は空気吐出口にインク液滴が衝突する様子を
示した空気吐出口付近拡大断面図、第４図は本発明の実
施例におけるインクジェット記録装置の断面図である。
１ ・・・・空気吐出口、４・・・・・・インク吐出口
、５・・・・・・信号源、６・・・・インク供給路。
代理人の氏名 弁理士 中 尾 敏 男 ほか１名第
１ 図
ロー−下
第２図
第３図FIG. 1 is a partial cross-sectional view showing the configuration of an inkjet recording device according to the applicant's earlier application, and FIG. 2 is an enlarged cross-sectional view of the vicinity of the air outlet of the inkjet head shown in FIG. 1. 3 is an enlarged cross-sectional view of the vicinity of the air discharge port showing how ink droplets collide with the air discharge port, and FIG. 4 is a cross-sectional view of an inkjet recording apparatus in an embodiment of the present invention. 1... Air discharge port, 4... Ink discharge port, 5... Signal source, 6... Ink supply path. Name of agent: Patent attorney Toshio Nakao and 1 other person
1 Figure Low - Lower Figure 2 Figure 3
Claims (1)
吐出口に対向して開口を有し空気流内にインクを飛翔さ
せるインク吐出口とを有し、前記空気吐出口の形状を、
前記気流の流出方向に拡大したことを特徴とするインク
ジェット記録装置。The air outlet has an air outlet that causes the air flow to flow out from the outlet, and an ink outlet that has an opening facing the air outlet and causes ink to fly into the air stream, and the shape of the air outlet is as follows:
An inkjet recording device characterized in that the airflow expands in the outflow direction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59197155A JPS6174848A (en) | 1984-09-20 | 1984-09-20 | inkjet recording device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59197155A JPS6174848A (en) | 1984-09-20 | 1984-09-20 | inkjet recording device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6174848A true JPS6174848A (en) | 1986-04-17 |
| JPH047904B2 JPH047904B2 (en) | 1992-02-13 |
Family
ID=16369678
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP59197155A Granted JPS6174848A (en) | 1984-09-20 | 1984-09-20 | inkjet recording device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6174848A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1319510A1 (en) * | 2001-12-17 | 2003-06-18 | Eastman Kodak Company | Inkjet drop selection in a non-uniform airstream |
-
1984
- 1984-09-20 JP JP59197155A patent/JPS6174848A/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1319510A1 (en) * | 2001-12-17 | 2003-06-18 | Eastman Kodak Company | Inkjet drop selection in a non-uniform airstream |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH047904B2 (en) | 1992-02-13 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |