JPH0444911B2 - - Google Patents
Info
- Publication number
- JPH0444911B2 JPH0444911B2 JP60156429A JP15642985A JPH0444911B2 JP H0444911 B2 JPH0444911 B2 JP H0444911B2 JP 60156429 A JP60156429 A JP 60156429A JP 15642985 A JP15642985 A JP 15642985A JP H0444911 B2 JPH0444911 B2 JP H0444911B2
- Authority
- JP
- Japan
- Prior art keywords
- ink
- signal voltage
- pulse width
- signal
- recording
- 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.)
- Expired - Lifetime
Links
- 238000000034 method Methods 0.000 claims description 9
- 238000010586 diagram Methods 0.000 description 4
- 230000004044 response Effects 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000005499 meniscus Effects 0.000 description 1
- 230000004043 responsiveness Effects 0.000 description 1
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
- B41J2/07—Ink jet characterised by jet control
- B41J2/075—Ink jet characterised by jet control for many-valued deflection
- B41J2/095—Ink jet characterised by jet control for many-valued deflection electric field-control type
-
- 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
- B41J2002/061—Ejection by electric field of ink or of toner particles contained in ink
-
- 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)
Description
【発明の詳細な説明】
産業上の利用分野
本発明は、インクを吐出させ被記録物に画像、
文字等を記録するインクジエツト記録方法に関す
る。DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention is directed to ejecting ink to form an image on a recorded material.
The present invention relates to an inkjet recording method for recording characters, etc.
従来の技術
所定値以上の電位差が設けられた場合、その電
位差が印加されている間インクが吐出し、電位差
が所定値以下になるとインクの吐出が停止される
インクジエツト記録装置の一実施例として第３図
に示すようなものがある。BACKGROUND ART When a potential difference greater than a predetermined value is provided, ink is ejected while the potential difference is applied, and ink ejection is stopped when the potential difference becomes less than the predetermined value. There is something like the one shown in Figure 3.
インク室４に隣接するインク吐出口２に対向し
て、空気吐出口１が設けられており、空気室５を
介して送られてくる空気が流出している。前記空
気吐出口１の前面には電極３が設けられており、
この電極３とインク室内のインクとの間に電位差
を設けると、前記インク吐出口２に保持されてい
るインクのメニスカスが引き伸ばされ、前記空気
吐出口１を通つて空気流の加速を受けながら、飛
翔する。 An air outlet 1 is provided opposite the ink outlet 2 adjacent to the ink chamber 4, and air sent through the air chamber 5 flows out. An electrode 3 is provided on the front surface of the air outlet 1,
When a potential difference is provided between this electrode 3 and the ink in the ink chamber, the meniscus of the ink held in the ink discharge port 2 is stretched, and while receiving acceleration of the air flow through the air discharge port 1, Fly.
第３図に示したインクジエツト記録装置の電極
３とインク室内のインクとの間に印加される電圧
は、例えば、第４図のごとくである。すなわち、
予めバイアス電圧Vbを印加しておき、それに重
畳した形態で信号電圧Vsを印加する。バイアス
電圧Vbの値はそれだけではインクが吐出しない
範囲（300〜500V程度）の電圧が選択され、イン
クの吐出の準備をする。そして信号電圧Vsが印
加されている期間にのみインクの吐出がなされ
る。インクの吐出が可能な最小の信号電圧Vs（闘
値電圧Vphと称する）は、信号電圧Vsが印加され
ている時間（パルス幅Pwと称す）に依存し、パ
ルス幅Pwが短かい程、闘値電圧が上昇する傾向
にある。第５図は、その一特性例であり、Pw＝
300μsではVph＝300V、Pw＝200μsではVph＝380V
というように変化する。 The voltage applied between the electrode 3 of the inkjet recording device shown in FIG. 3 and the ink in the ink chamber is as shown in FIG. 4, for example. That is,
A bias voltage V b is applied in advance, and a signal voltage V s is applied superimposed thereon. The value of the bias voltage V b is selected to be within a range (approximately 300 to 500 V) that does not cause ink to be ejected by itself, and prepares for ink ejection. Ink is ejected only during the period when the signal voltage Vs is applied. The minimum signal voltage V s (referred to as threshold voltage V ph ) that allows ink to be ejected depends on the time during which the signal voltage V s is applied (referred to as pulse width P w ), and the pulse width P w is The shorter the time, the higher the threshold voltage tends to be. Figure 5 shows an example of its characteristics, where P w =
For 300μs, V ph = 300V; for P w = 200μs, V ph = 380V
It changes like this.
第６図は、信号電圧Vsが印加された場合のイ
ンクによるドツトの形成のされ方を示したもので
ある。第６図ａは画像信号が010101101110（１は
ON，０はOFF）を入力された場合の信号電圧Vs
の波形を示す。ｂはその時のドツトの形成のされ
方を示し、0110，01110，の場合は010の場合に比
較して２倍あるいは３倍の時間インクが吐出し、
それぞれ長いドツトが形成される。 FIG. 6 shows how dots are formed by ink when a signal voltage Vs is applied. In Figure 6a, the image signal is 010101101110 (1 is
Signal voltage V s when input is ON, 0 is OFF)
The waveform of is shown. b indicates how dots are formed at that time; in the case of 0110, 01110, the ink is ejected for twice or three times as long as in the case of 010;
Each long dot is formed.
第６図に示すような信号形態によりインクを吐
出させた場合、それによつて得られる記録画素の
周波数pは信号電圧Vsのパルス幅Pw＝１／pに
よつて決定される。 When ink is ejected using the signal form shown in FIG. 6, the frequency p of the recorded pixels obtained thereby is determined by the pulse width P w =1/ p of the signal voltage V s .
例えばVs＝300Vの場合にはPw≧300μsである
ので、記録画素の最高周波数は3.3KHzとなる。 For example, when V s =300V, P w ≧300 μs, so the highest frequency of the recording pixel is 3.3 KHz.
そして、さらに記録画素の周波数を高くするた
めには信号電圧Vsを高くする必要がある。 In order to further increase the frequency of the recording pixels, it is necessary to increase the signal voltage Vs.
発明が解決しようとする問題点
以上詳細な説明のように、第６図のような信号
形態においては、記録画素の周波数を高くするた
めには、信号電圧Vsを高くする必要が生じ、安
全性や価格の面で問題があり、逆に信号電圧Vs
を低くすれば、記録画素の周波数が低下し、記録
速度が遅くなるという難点があつた。Problems to be Solved by the Invention As described in detail above, in the signal format shown in FIG . There are problems in terms of performance and price, and conversely, the signal voltage V s
If the number of pixels is lowered, the frequency of the recording pixels decreases, resulting in a disadvantage that the recording speed becomes slower.
本発明はこのような欠点を解消を解消するため
になされたもので、低信号電圧で高速記録が可能
なインクジエツト記録方法を得ることを目的とす
るものである。 The present invention has been made to overcome these drawbacks, and an object of the present invention is to provide an inkjet recording method capable of high-speed recording with a low signal voltage.
問題点を解決するための手段
本発明は、所定の周波数pに従つて入力される
画像信号に対応して、少なくとも、その最小パル
ス幅が１／pより大で２／pより小なる値を有す
る信号電圧によりインクに静電力による吸引力を
作用させ、前記信号電圧が印加されている間に、
インク吐出口よりインクが吐出され、前記信号電
圧が印加されていない時にはインクを吐出しない
こととしたインクジエツト記録方法である。Means for Solving the Problems The present invention provides at least a minimum pulse width of at least a value greater than 1/ p and less than 2/ p in response to an image signal input according to a predetermined frequency p . Applying an electrostatic attraction force to the ink using a signal voltage, and while the signal voltage is applied,
This is an inkjet recording method in which ink is ejected from an ink ejection port, and no ink is ejected when the signal voltage is not applied.
作 用
信号電圧Vsはインクに印加され、その静電力
によりインクは吐出する。このとき、信号電圧
Vsの最小パルス幅は記録画素の周波数pの逆数
より大きいので、信号電圧Vsを高くしなくとも
記録画素の周波数を高めることができるので、見
かけ上の応答性で向上し高速記録が可能となる。Operation The signal voltage V s is applied to the ink, and the ink is ejected due to its electrostatic force. At this time, the signal voltage
Since the minimum pulse width of V s is larger than the reciprocal of the recording pixel frequency p , it is possible to increase the recording pixel frequency without increasing the signal voltage V s , which improves the apparent response and enables high-speed recording. becomes.
実施例
第１図は本発明の一実施例における動作波形を
示す。第１図ａは画素の出現周期を決定するクロ
ツクパルスであり、pの周波数を有しているｂ
は、前記クロツクパルスに同期して出力された
010101101110で表わされる画像信号である。ｃ
は、本発明で採用される信号電圧Vsの波形を示
したもので、そのパルス幅Pwが画像信号ｂのパ
ルス幅１／pよりｄ（但しＯ＜α＜１／p）だけ
大きくなつている。ｄはｃの信号電圧Vsにより
吐出されたインクにより記録されるドツトの形状
を記したものである。Embodiment FIG. 1 shows operating waveforms in an embodiment of the present invention. Figure 1 a shows a clock pulse that determines the period of pixel appearance, and b has a frequency of p .
is output in synchronization with the clock pulse.
This is an image signal expressed as 010101101110. c.
shows the waveform of the signal voltage V s adopted in the present invention, and its pulse width P w is larger than the pulse width 1/ p of the image signal b by d (however, O<α<1/ p ). ing. d indicates the shape of a dot recorded by ink ejected by the signal voltage Vs of c.
第１図の信号では、ｃに示すように信号電圧
Vsのパルス幅Pwがαだけ長くなつた分、OFFに
なつている時間が短かくなるが、一応ドツト間に
余白を生じさせることができるパルス幅Pwを選
定すれば、見かけ上、長いパルス幅Pwで、信号
電圧Vsを高くすることなく記録画素周波数の高
い記録条件を選ぶことができる。 For the signal in Figure 1, the signal voltage is
As the pulse width P w of V s becomes longer by α, the OFF time becomes shorter, but if you select a pulse width P w that can create a margin between the dots, the apparent With a long pulse width P w , it is possible to select a recording condition with a high recording pixel frequency without increasing the signal voltage V s .
実施例ではVs＝300Vで実験を行つたが、従来
の信号形態ではp＝１／Pw＝3.3KHzが記録画素
の最高周波数であつたが、Pw＝１／p＋100＝
300（μs）に設定することによつて、p＝5KHzま
で高めることができた。また、例えば、信号電圧
Vsが同様に300Vで、吐出ノズルの構成等から吐
出可能な限界に対応する信号電圧の最小パルス幅
が300μsであつたとすると、従来の方法では記録
時の１画素を記録する信号電圧のパルス幅は、必
ず300μs以上必要であるので、記録画素の周波数
pは3.3kHz以下に設定せざるを得ないが、信号電
圧のパルス幅を増加させる本発明によれば、パル
ス幅を300μs以上に保つたまま記録画素の周波数
pを最大6.6kHz以下にまで設定することが可能と
なり、記録する際の画像信号の最小パルス幅を変
える事なく、単位時間当りの記録画素数を増加さ
せることができ、応答性が向上し高速記録が可能
となる。 In the example, the experiment was conducted with V s = 300V, but in the conventional signal format, the highest frequency of the recording pixel was p = 1/P w = 3.3KHz, but P w = 1/ p + 100 =
By setting it to 300 (μs), it was possible to increase p to 5KHz. Also, for example, the signal voltage
Assuming that V s is 300V and the minimum pulse width of the signal voltage corresponding to the ejection limit due to the configuration of the ejection nozzle is 300μs, in the conventional method, the pulse width of the signal voltage to record one pixel during recording is The width must be at least 300μs, so the frequency of the recording pixel
p must be set to 3.3kHz or less, but according to the present invention, which increases the pulse width of the signal voltage, the recording pixel frequency can be increased while keeping the pulse width at 300μs or more.
It is now possible to set p to a maximum of 6.6 kHz or less, and the number of recording pixels per unit time can be increased without changing the minimum pulse width of the image signal during recording, resulting in improved responsiveness and high speed. Recording becomes possible.
なお、第１図において、原理的には信号電圧
Vsのパルス幅Pwを長くするのは、それが最小の
パルス幅である時のみであれば十分であり、例え
ば画像信号が0110，01110のように２以上連続し
てONになる状態の場合には、それに対応する信
号電圧Vsのパルス幅Pwを画像信号のそれより長
くする必要はない。したがつてパルス幅Pwは
Pw＝ｎ／p＋α
但し、Ｏ＜α＜１／p ｎは正の整数
と表わすことができる。ここで、ｎ＝１のときが
最小のパルス幅であり、そのときのパルス幅Pw
minは
１／p＜Pwmin＜２／p
となる。 In addition, in Figure 1, in principle, the signal voltage
It is sufficient to lengthen the pulse width P w of V s only when it is the minimum pulse width. In this case, it is not necessary to make the pulse width P w of the corresponding signal voltage V s longer than that of the image signal. Therefore, the pulse width P w is P w =n/ p + α, where O<α<1/ p n can be expressed as a positive integer. Here, the minimum pulse width is when n=1, and the pulse width P w
min is 1/ p <Pwmin<2/ p .
回路作製上は第１図のような信号形態が実現性
があり、例えば第２図のような回路により実現で
きる。すなわち、クロツクパルス発生器１１で第
１図ａのクロツクパルスを発生させ、これと画像
信号発生器１２から画像信号（第１図ｂ参照）の
論理積をAND回路１３でとり、再トリガ可能な
モノマルチ１４に入力し、その出力をドライバー
１５により増幅することにより、第１図ｃの信号
電圧Vsの波形が得られる。この時、第１図でパ
ルス幅Pwを長くするαの値は、モノマルチ１４
から出力されるパルス幅を設定することによつて
決定される。 In terms of circuit fabrication, a signal format as shown in FIG. 1 is feasible, and can be realized, for example, by a circuit as shown in FIG. 2. In other words, the clock pulse generator 11 generates the clock pulse shown in FIG. 14 and amplifying its output by the driver 15, the waveform of the signal voltage Vs shown in FIG. 1c is obtained. At this time, the value of α that increases the pulse width P w in Fig. 1 is 14
It is determined by setting the pulse width output from the
上記の方法は、第３図に示したような空気流と
静電力を利用したインクジエツト記録装置に限ら
ず、インクに静電力を印加する各種方式のインク
ジエツト記録装置に適用できる。 The above method can be applied not only to the inkjet recording apparatus using air flow and electrostatic force as shown in FIG. 3, but also to various types of inkjet recording apparatus that apply electrostatic force to ink.
発明の効果
以上のように、本発明は画像信号周波数に応じ
たパルス幅の信号電圧をインクに印加して、この
信号電圧に応じてインク吐出を制御するようにし
たインクジエツト記録方法で、インクジエツト記
録装置に印加される信号電圧Vsを高くすること
なく、記録画素周波数を高くすることができ、安
価で安全な駆動回路で、高速記録が可能なインジ
エクト記録装置が提供できる。Effects of the Invention As described above, the present invention is an inkjet recording method in which a signal voltage with a pulse width corresponding to an image signal frequency is applied to ink, and ink ejection is controlled according to this signal voltage. The recording pixel frequency can be increased without increasing the signal voltage V s applied to the device, and an inject recording device capable of high-speed recording can be provided with an inexpensive and safe drive circuit.
第１図は本発明の実施例における信号波形図、
第２図は本発明の実施例における回路ブロツク
図、第３図は本発明が適用されるインクジエツト
記録装置の一実施例を示す断面側面図、第４図は
従来のインクジエツト記録方法における信号波形
図、第５図は第２図のインクジエツト記録装置の
特性を示すグラフ、第６図は従来のインクジエツ
ト記録方法における信号波形図である。
２…インク吐出口、３…電極、４…インク室、
１１…クロツクパルス発生器、１２…画像信号発
生器、１３…AND回路、１４…モノマルチ。
FIG. 1 is a signal waveform diagram in an embodiment of the present invention,
FIG. 2 is a circuit block diagram in an embodiment of the present invention, FIG. 3 is a sectional side view showing an embodiment of an inkjet recording apparatus to which the present invention is applied, and FIG. 4 is a signal waveform diagram in a conventional inkjet recording method. , FIG. 5 is a graph showing the characteristics of the inkjet recording apparatus shown in FIG. 2, and FIG. 6 is a signal waveform diagram in the conventional inkjet recording method. 2... Ink discharge port, 3... Electrode, 4... Ink chamber,
11... Clock pulse generator, 12... Image signal generator, 13... AND circuit, 14... Monomulti.
Claims (1)
に対応して、少なくとも、その最小パルス幅が
１／fpより大で２／pより小なる値を有する信号
電圧によりインクに静電力による吸引力を作用さ
せ、前記信号電圧が印加されている間に、インク
吐出口よりインクが吐出され、前記信号電圧が印
加されていない時にはインクを吐出しないことを
特徴とするインクジエツト記録方法。 ２ 信号電圧のパルス幅Pwが Pw＝ｎ／p＋α但し、０＜α＜１／p ｎは正の整数 で表わされることを特徴とする特許請求の範囲第
１項記載のインクジエツト記録方法。[Claims] 1. Corresponding to an image signal input according to a predetermined frequency p , at least a signal voltage whose minimum pulse width has a value larger than 1/f p and smaller than 2/ p An ink jet characterized in that an attractive force by electrostatic force is applied to the ink, ink is ejected from the ink ejection port while the signal voltage is applied, and no ink is ejected when the signal voltage is not applied. Recording method. 2. The inkjet recording method according to claim 1, wherein the pulse width P w of the signal voltage is P w =n/ p + α, where 0<α<1/ p n is represented by a positive integer. .
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15642985A JPS6218272A (en) | 1985-07-16 | 1985-07-16 | Ink jet recording method |
| US06/886,245 US4684957A (en) | 1985-07-16 | 1986-07-16 | Method for operation of an ink jet printing head |
| DE8686305477T DE3677273D1 (en) | 1985-07-16 | 1986-07-16 | METHOD FOR OPERATING A COLOR JET PRINT HEAD. |
| EP86305477A EP0210048B1 (en) | 1985-07-16 | 1986-07-16 | Method for operation of an ink jet printing head |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15642985A JPS6218272A (en) | 1985-07-16 | 1985-07-16 | Ink jet recording method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6218272A JPS6218272A (en) | 1987-01-27 |
| JPH0444911B2 true JPH0444911B2 (en) | 1992-07-23 |
Family
ID=15627551
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15642985A Granted JPS6218272A (en) | 1985-07-16 | 1985-07-16 | Ink jet recording method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6218272A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0216295U (en) * | 1988-07-08 | 1990-02-01 |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5970579A (en) * | 1982-10-15 | 1984-04-21 | Toray Ind Inc | Driving method of ink jet head |
-
1985
- 1985-07-16 JP JP15642985A patent/JPS6218272A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5970579A (en) * | 1982-10-15 | 1984-04-21 | Toray Ind Inc | Driving method of ink jet head |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6218272A (en) | 1987-01-27 |
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