JPS639552A - Ink jet recorder - Google Patents
Ink jet recorderInfo
- Publication number
- JPS639552A JPS639552A JP15465586A JP15465586A JPS639552A JP S639552 A JPS639552 A JP S639552A JP 15465586 A JP15465586 A JP 15465586A JP 15465586 A JP15465586 A JP 15465586A JP S639552 A JPS639552 A JP S639552A
- Authority
- JP
- Japan
- Prior art keywords
- electrode
- ink droplet
- ink
- ink jet
- deflecting
- 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
Links
- 238000000926 separation method Methods 0.000 claims abstract description 13
- 238000001514 detection method Methods 0.000 claims description 36
- 238000010276 construction Methods 0.000 abstract 1
- 230000002349 favourable effect Effects 0.000 abstract 1
- 239000012212 insulator Substances 0.000 abstract 1
- 238000001454 recorded image Methods 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 7
- 239000003990 capacitor Substances 0.000 description 1
- 239000013256 coordination polymer Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005686 electrostatic field Effects 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000000034 method Methods 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
- B41J2/125—Sensors, e.g. deflection sensors
-
- 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
- B41J2/08—Ink jet characterised by jet control for many-valued deflection charge-control type
- B41J2/09—Deflection means
Landscapes
- Particle Formation And Scattering Control In Inkjet Printers (AREA)
Abstract
Description
【発明の詳細な説明】
技術分野
本発明は、インクジェット記録装置、より詳細には、荷
電偏向型インクジェット記録装置におけるインク滴分離
のタイミング検出に関する。TECHNICAL FIELD The present invention relates to an inkjet recording apparatus, and more particularly to timing detection of ink droplet separation in a charge deflection type inkjet recording apparatus.
従来技術
第５図は、従来のインクジェット記録装置の一例を説明
するための構成図で、図中、１はインクジェット噴射ヘ
ッド本体、２は電歪振動子、３は振動板、４はノズル、
５は荷電電極、６はインク滴、７．７は一対の偏向電極
、８は記録用紙、９はガター、１０は制御回路、１１は
荷電電圧発生回路、１２は偏向電圧発生回路、１３は検
出電極。PRIOR ART FIG. 5 is a configuration diagram for explaining an example of a conventional inkjet recording apparatus, in which 1 is an inkjet jetting head body, 2 is an electrostrictive vibrator, 3 is a diaphragm, 4 is a nozzle,
5 is a charging electrode, 6 is an ink droplet, 7.7 is a pair of deflection electrodes, 8 is a recording paper, 9 is a gutter, 10 is a control circuit, 11 is a charging voltage generation circuit, 12 is a deflection voltage generation circuit, 13 is a detection electrode.
１４は検出回路、１５は正弦波発生回路で１周知のよう
に、インクジェット記録ヘッドには加圧インクが供給さ
れ、ノズル４よりインク流として噴射される。このとき
ヘッドの１部を構成する振動板３に接着された電歪振動
子２に交流電圧を印加すると前記インク流は交流電圧の
同期に同期して飛翔インク滴６に分離する。インク滴が
分離するタイミングに同期して荷電電圧発生回路１１よ
り荷電電極５に所定の電極を印加すると、インク滴６は
前記電圧に応じた電荷を帯びる。荷電されたインク滴は
、１対の偏向電極７，７にて形成される静電界によって
偏向されて該記録体８に衝突し、記録を残す。荷電され
ないインク滴はガター９にて捕獲され、回収されて再使
用される。14 is a detection circuit, and 15 is a sine wave generating circuit. As is well known, pressurized ink is supplied to the inkjet recording head and is ejected from the nozzle 4 as an ink stream. At this time, when an AC voltage is applied to an electrostrictive vibrator 2 bonded to a diaphragm 3 forming a part of the head, the ink flow is separated into flying ink droplets 6 in synchronization with the AC voltage. When a predetermined voltage is applied to the charging electrode 5 from the charging voltage generating circuit 11 in synchronization with the timing at which the ink droplet separates, the ink droplet 6 is charged in accordance with the voltage. The charged ink droplets are deflected by the electrostatic field formed by the pair of deflection electrodes 7, 7, and collide with the recording medium 8, leaving a record. Uncharged ink droplets are captured by the gutter 9, collected and reused.
第６図において、（ａ）は電歪子に印加される交流電圧
でしいはインク滴分離タイミング。In FIG. 6, (a) indicates the alternating current voltage applied to the electrostrictor or the ink droplet separation timing.
（ｂ）、〜（ｂ）。はインク滴分離タイミング検知用荷
電電圧パルス（以下検知パルスと略記する）である。第
６図においては一例として検知パルスのパルス幅τを前
期交流電圧周期（これをＴとする）に対してＴ／８くτ
＜２Ｔ／８に設定しであるものとする。インク滴分離位
相検知時には検知パルスが（ｂ）１〜（ｂ）２・・・と
いうふうに順次荷電電極に印加され、それぞれの位相に
おいて検知動作が行なわれ、図示例の場合、（ｂ）３に
おいてインク滴分離のタイミングが検出される。(b), ~(b). is a charging voltage pulse (hereinafter abbreviated as a detection pulse) for detecting ink droplet separation timing. In Fig. 6, as an example, the pulse width τ of the detection pulse is multiplied by T/8 τ with respect to the previous AC voltage period (this is designated as T).
<2T/8. When detecting the ink droplet separation phase, detection pulses are sequentially applied to the charging electrodes in the order of (b) 1 to (b) 2..., and a detection operation is performed in each phase. In the illustrated example, (b) 3 The timing of ink drop separation is detected at .
上述のように、荷電偏向型インクジェット記録装置にお
けるインク滴分離タイミングの検知において、従来より
、インク滴の飛翔経路の近傍に検出電極を配置し、荷電
インク滴によって検出電極へ誘起される電流を検出する
ことによりインク滴分離タイミングを検知するいわゆる
誘導型検出方式はよく知られているものであるが、従来
は、上述のように、専用の検出電極はインク滴の飛翔方
向に沿ってその途中に配置されていた。そのためインク
滴の飛翔経路が長くなり、装置の小型化。As mentioned above, in detecting ink droplet separation timing in charged deflection type inkjet recording devices, conventionally a detection electrode is placed near the flight path of the ink droplet, and the current induced in the detection electrode by the charged ink droplet is detected. The so-called inductive detection method, which detects the timing of ink droplet separation by It was placed. As a result, the flight path of the ink droplets becomes longer, making the device more compact.
高導度化のさまたげとなる、クーロン力や空気抵抗の影
響が大きくなり、印字歪みが発生しやすくなる等の欠点
を有していた。This method has disadvantages such as increased influence of Coulomb force and air resistance, which hinders high conductivity, and increases the likelihood of printing distortion.
目 的
本発明は、上述のごとき実情に鑑みてなされたもので、
特に、荷電量制御型インクジェット記録装置において、
装置の小型化、良好な印字状態を安定的に得ることを目
的としてなされたものである。Purpose The present invention was made in view of the above-mentioned circumstances.
In particular, in a charge amount control type inkjet recording device,
This was done for the purpose of downsizing the device and stably obtaining good printing conditions.
構 成
本発明は、上記目的を達成するために、インク滴を荷電
する荷電電極と、荷電されたインク滴を所定方向に偏向
するための１対の偏向電極と、前記インク滴の飛翔経路
の近傍に配設された検出電極とを有し、該検出電極へ誘
起される電流の有無を検出することにより前記インク滴
の分離タイミングを検知するインクジェット記録装置に
おいて、前記偏向電極の１部又は全部を前記検出電極と
兼用したことを特徴としたものである。以下、本発明の
実施例に基づいて説明する。Configuration In order to achieve the above object, the present invention includes: a charging electrode that charges an ink droplet; a pair of deflection electrodes that deflects the charged ink droplet in a predetermined direction; In the inkjet recording apparatus, the inkjet recording apparatus has a detection electrode arranged in the detection electrode, and detects the separation timing of the ink droplet by detecting the presence or absence of a current induced in the detection electrode, in which a part or all of the deflection electrode is It is characterized in that it also serves as the detection electrode. Hereinafter, the present invention will be explained based on examples.
第１図は、本発明によるインクジェット記録装置の一実
施例を説明するための構成図で、図中、第５図に示した
従来のインクジェット記録装置と同様の作用をする部分
には第５図の場合と同一の参照番号が付しである。而し
て１本発明によるインクジェット記録装置と第５図に示
した従来のインクジェット記録装置の違いは、検出電極
１３の配置にあり１本発明においては、検出電極１３は
、一方の偏向電極の１部分で兼用しており、兼用してい
る部分と残りの部分は薄い絶縁層１６で分離されている
。従って、その動作は第５図に示した従来のインクジェ
ット記録装置と同じである。FIG. 1 is a configuration diagram for explaining one embodiment of an inkjet recording apparatus according to the present invention. The same reference numbers as in the case are given. 1. The difference between the inkjet recording device according to the present invention and the conventional inkjet recording device shown in FIG. Some portions are used for both purposes, and the portions that are used for both purposes and the remaining portions are separated by a thin insulating layer 16. Therefore, its operation is the same as that of the conventional inkjet recording apparatus shown in FIG.
第２図は、第１図における検出電極部を拡大して示した
もので、検出電極１３は偏向電極をも兼ねており、イン
ク滴６が荷電された場合、荷電インク滴６が検出電極１
３の近傍を通過する際、該ｆｆｉ極１３に誘導電流が発
生し、検出回路１４に流れ込む。FIG. 2 is an enlarged view of the detection electrode section in FIG. 1, and the detection electrode 13 also serves as a deflection electrode.
3, an induced current is generated in the ffi pole 13 and flows into the detection circuit 14.
前述のように、インク滴分離タイミング検知時には第６
図の（ｂ）、〜（ｂ）、に示した検知パルスが順次印加
されるが、検知パルスは長い時間レンジでは第４図（ａ
）に示すようにｎ個のパルス列の０Ｎ１０ＦＦで印加さ
れる。このとき偏向電圧はＯＦＦしており、インク滴は
荷電の有無に関係なく直進し、検出電極の近傍を通過し
てガターに捕獲される。As mentioned above, when detecting the ink droplet separation timing, the sixth
The detection pulses shown in (b) and (b) of the figure are applied sequentially, but the detection pulse is
), n pulse trains of 0N10FF are applied. At this time, the deflection voltage is OFF, and the ink droplet travels straight regardless of whether it is charged or not, passes near the detection electrode, and is captured by the gutter.
第３図は、第１図に示した検出回路１４の一実施例を説
明するための詳細図で、検出電極と検出回路はシールド
ケーブルにて接続されており、その容量をＣ工とする。FIG. 3 is a detailed diagram for explaining one embodiment of the detection circuit 14 shown in FIG. 1. The detection electrode and the detection circuit are connected by a shielded cable, and the capacitance thereof is assumed to be C.
また、抵抗Ｒ工は回路の入力抵抗である。いま、Ｃ工、
Ｒ工による積分回路の時定数Ｃ□・Ｒ工をＴ＜Ｃ，・Ｒ
工≦ｎ−Ｔに設定すると、検出回路の入力端子には第４
図（ｂ）に示すような電圧が発生する。この電圧はトラ
ンジスタＱ及び抵抗Ｒ２で構成されるバッファを通って
増幅器Ａにて増幅され、ローパスフィルタＬ−Ｐ・Ｆに
て高周収分が除去され、ダイオードＤ、コンデンサＣ１
，抵抗Ｒ３にて整流平滑化され、平滑化された信号電圧
によってコンパレータＣＰが反転される。この反転信号
はスイッチング回路ＳＷにてＴＴＬレベルの信号に変換
されて制御部へ送られ、インク滴分離位相と判断される
。一定期間誘導電流が検出できないとインク滴分離位相
でないと判断され検知パルスの位相をシフトして再び検
知動作を行う。Further, the resistor R is the input resistance of the circuit. Now, C engineer.
The time constant C□・R of the integration circuit by R is T<C,・R
When setting ≦n-T, the input terminal of the detection circuit is
A voltage as shown in Figure (b) is generated. This voltage passes through a buffer consisting of a transistor Q and a resistor R2, is amplified by an amplifier A, and a high frequency component is removed by a low-pass filter L-P.F, and a diode D and a capacitor C1
, and is rectified and smoothed by resistor R3, and the comparator CP is inverted by the smoothed signal voltage. This inverted signal is converted into a TTL level signal by the switching circuit SW and sent to the control section, where it is determined to be the ink droplet separation phase. If the induced current cannot be detected for a certain period of time, it is determined that the ink droplet separation phase is not reached, and the phase of the detection pulse is shifted and the detection operation is performed again.
効 果
以上の説明から明らかなように、本発明によると、
（イ）偏向電極と検知電極を兼用するため構成が単純化
され、装置の小型化がなされる。Effects As is clear from the above explanation, according to the present invention, (a) the structure is simplified because the deflection electrode and the detection electrode are used both, and the device is made smaller.
（ロ）インク滴の飛翔距離が短くなり、クーロン力や空
気抵抗による歪みが軽減され、安定した印字状態が達成
される。(b) The flying distance of ink droplets is shortened, distortion caused by Coulomb force and air resistance is reduced, and stable printing conditions are achieved.
等の利点がある。There are advantages such as
第１図は、本発明によるインクジェット記録装置の一実
施例を説明するための構成図、第２図は、第１図に示し
た検出電極部の拡大図、第３図は。
第１図に示した検出回路の詳細図、第４図は、検出パル
スの例を示す図、第５図は、従来のインクジェット記録
装置の一例を示す図、第６図は、荷電タイミングの例を
説明するための図である。
１・・・インクジェット噴射ヘッド本体、２・・・電歪
振動子、３・・・振動板、４・・・ノズル、５・・・荷
電電極。
６・・・インク滴、７・・・偏向電極、８・・・記録用
紙、９・・・ガター、１０・・・制御回路、１１・・・
荷電電圧発生回路、１２・・・偏向電圧発生回路、１３
・・・検出電極。
１４・・・検出回路、１５・・・正弦波発生回路。
特許出願人 株式会社 リコー
第 １ 図
第２図
／ ｔｅｌ Ｉｊ
第３図
第４図FIG. 1 is a block diagram for explaining an embodiment of an inkjet recording apparatus according to the present invention, FIG. 2 is an enlarged view of the detection electrode section shown in FIG. 1, and FIG. 3 is an enlarged view of the detection electrode section shown in FIG. FIG. 1 is a detailed diagram of the detection circuit shown in FIG. 1, FIG. 4 is a diagram showing an example of a detection pulse, FIG. 5 is a diagram showing an example of a conventional inkjet recording device, and FIG. 6 is an example of charging timing. FIG. DESCRIPTION OF SYMBOLS 1... Inkjet ejection head main body, 2... Electrostrictive vibrator, 3... Vibration plate, 4... Nozzle, 5... Charging electrode. 6... Ink droplet, 7... Deflection electrode, 8... Recording paper, 9... Gutter, 10... Control circuit, 11...
Charge voltage generation circuit, 12... Deflection voltage generation circuit, 13
...Detection electrode. 14...Detection circuit, 15...Sine wave generation circuit. Patent applicant Ricoh Co., Ltd. Figure 1 Figure 2/tel Ij Figure 3 Figure 4
Claims (1)
所定方向に偏向するための１対の偏向電極と、前記イン
ク滴の飛翔経路の近傍に配設された検出電極とを有し、
該検出電極へ誘起される電流の有無を検出することによ
り前記インク滴の分離タイミングを検知するインクジェ
ット記録装置において、前記偏向電極の１部又は全部を
前記検出電極と兼用したことを特徴とするインクジェッ
ト記録装置。It has a charging electrode that charges the ink droplet, a pair of deflection electrodes that deflects the charged ink droplet in a predetermined direction, and a detection electrode disposed near the flight path of the ink droplet,
An inkjet recording device that detects the separation timing of the ink droplet by detecting the presence or absence of a current induced in the detection electrode, characterized in that a part or all of the deflection electrode is also used as the detection electrode. Recording device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15465586A JPS639552A (en) | 1986-07-01 | 1986-07-01 | Ink jet recorder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15465586A JPS639552A (en) | 1986-07-01 | 1986-07-01 | Ink jet recorder |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS639552A true JPS639552A (en) | 1988-01-16 |
Family
ID=15588983
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15465586A Pending JPS639552A (en) | 1986-07-01 | 1986-07-01 | Ink jet recorder |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS639552A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0236949A (en) * | 1988-07-27 | 1990-02-06 | Toppan Printing Co Ltd | Ink jet printer |
-
1986
- 1986-07-01 JP JP15465586A patent/JPS639552A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0236949A (en) * | 1988-07-27 | 1990-02-06 | Toppan Printing Co Ltd | Ink jet printer |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JPH0117865B2 (en) | ||
| US4288796A (en) | Phase detection in an ink jet system printer of the charge amplitude controlling type | |
| JPS6256149A (en) | Ink jet recording apparatus | |
| JPS639552A (en) | Ink jet recorder | |
| US4524366A (en) | Ink jet charge phasing apparatus | |
| EP0210048B1 (en) | Method for operation of an ink jet printing head | |
| US4027309A (en) | Ink jet printer apparatus and method of printing | |
| JPS591595B2 (en) | Droplet condition detection device | |
| JPH08258271A (en) | Continuous jet type ink jet recording apparatus and optimum exciting frequency setting method thereof | |
| JPS6179671A (en) | Control of charge phase in charge quantity control type multinozzle ink jet recording apparatus | |
| JPS6179670A (en) | Control of charge phase in charge quantity control type multinozzle ink jet recording apparatus | |
| JPS5822179A (en) | Ink jet recorder | |
| JPH0342581B2 (en) | ||
| JPS6235853A (en) | Drum scanning type ink jet recording apparatus | |
| JPS58171966A (en) | Defector for blocking of liquid droplet injector | |
| JPS62130856A (en) | Controller for exciting voltage in ink jet recorder | |
| JPS6321625B2 (en) | ||
| JPH036432Y2 (en) | ||
| JPH09226129A (en) | Phase detector and ink jet recorder | |
| JPS6321626B2 (en) | ||
| JPS60112454A (en) | Ink jet recording device | |
| JPS60174656A (en) | Cutting phase detecting circuit in ink jet recorder | |
| JPS591594B2 (en) | Inkjet recording device | |
| JPS5968259A (en) | Deflection controlled ink jet recording apparatus | |
| JPH0360070B2 (en) |