JPS6234552B2 - - Google Patents
Info
- Publication number
- JPS6234552B2 JPS6234552B2 JP54100630A JP10063079A JPS6234552B2 JP S6234552 B2 JPS6234552 B2 JP S6234552B2 JP 54100630 A JP54100630 A JP 54100630A JP 10063079 A JP10063079 A JP 10063079A JP S6234552 B2 JPS6234552 B2 JP S6234552B2
- Authority
- JP
- Japan
- Prior art keywords
- ink
- output
- comparator
- charging
- ink particles
- 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
Links
- 239000002245 particle Substances 0.000 claims description 40
- 230000010354 integration Effects 0.000 claims description 10
- 238000007641 inkjet printing Methods 0.000 claims description 6
- 230000005684 electric field Effects 0.000 claims description 5
- 238000000034 method Methods 0.000 claims description 3
- 238000000926 separation method Methods 0.000 claims description 3
- 238000001514 detection method Methods 0.000 description 27
- 238000007639 printing Methods 0.000 description 6
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 description 3
- 102100029469 WD repeat and HMG-box DNA-binding protein 1 Human genes 0.000 description 2
- 101710097421 WD repeat and HMG-box DNA-binding protein 1 Proteins 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 2
- 239000003990 capacitor Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000005284 excitation Effects 0.000 description 2
- 230000005669 field effect Effects 0.000 description 2
- 230000006698 induction Effects 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000010349 pulsation Effects 0.000 description 1
- 238000001454 recorded image Methods 0.000 description 1
- 238000011084 recovery 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
- B41J2/12—Ink jet characterised by jet control testing or correcting charge or deflection
Landscapes
- Particle Formation And Scattering Control In Inkjet Printers (AREA)
Description
【発明の詳細な説明】
本発明は、ノズルより超音波振動を加えたイン
クを噴射し、噴射インクがインク粒子に分離する
位置において荷電電極により選択的に荷電をおこ
ない、荷電インク粒子を偏向電極で偏向せしめて
記録紙に衝突させるインクジエツト記録装置に関
し特にインク粒子の生成と荷電電圧の印加との相
対的なタイミングを設定する位相検索方法に関す
る。DETAILED DESCRIPTION OF THE INVENTION The present invention involves ejecting ink subjected to ultrasonic vibration from a nozzle, selectively charging the ejected ink at a position where it separates into ink particles with a charging electrode, and deflecting the charged ink particles with an electrode. The present invention relates to an inkjet recording device in which ink particles are deflected by an ink jet and collided with a recording paper, and more particularly to a phase search method for setting the relative timing between the generation of ink particles and the application of a charging voltage.
この種のインクジエツト記録装置はすでに従来
公知である（IMB Technical Disclosure
Bulletin.Vol.16 No.12May 1974.特公昭47−43450
号．特開昭50−46450号等）。しかしこの種の記録
装置においては、インク粒子の生成と荷電電極へ
の荷電電圧（パルス状）の印加タイミングがずれ
ると、インク粒子の荷電量が意図したものになら
ず、記録紙上において印写ドツトのずれを生じ、
記録画像に乱れを生ずる。したがつて従来におい
ては、たとえば特公昭47−43450号公報や特開昭
50−60131号公報等に開示されている如く、イン
ク粒子の適正荷電位相を検索して、荷電電極への
荷電電圧の印加タイミングを適正に定めることが
おこなわれている。このため、従来においては光
電センサーを用いて、荷電インク粒子が所定の軌
道を飛翔することを検出したり、静電誘導により
インク粒子の荷電を検出したり、あるいは所定の
軌道上に検出電極を配置してこれに荷電インク粒
子が衝突したときの該検出電極の電位変化を検出
して、インク粒子が所望の荷電をしているか否か
を検出している。しかしながら、これらの従来の
荷電検出法では、光電センサーを用いる場合にお
いてはインク粒子が極く小径であるためＳ／Ｎが
低いという問題、静電誘導による場合はやはりイ
ンク粒子の荷電量が小さいのでＳ／Ｎ比が低くし
かも荷電、非荷電の検出はできても荷電量の検出
は無理であるという問題があり、インク粒子が衝
突する検出電極を用いる場合には、インク粒子の
はね返りにより実際に検出電極に与えられる荷電
が少なく、荷電量の正確は検出が困難であるとい
う問題がある。 This type of inkjet recording device is already known (IMB Technical Disclosure).
Bulletin.Vol.16 No.12May 1974.Special Publication Showa 47-43450
issue. JP-A No. 50-46450, etc.). However, in this type of recording device, if the timing of the generation of ink particles and the application of charging voltage (pulsed) to the charging electrode are misaligned, the amount of charge on the ink particles will not be as intended, and the printed dots will not be printed on the recording paper. causing a misalignment,
This causes disturbances in recorded images. Therefore, in the past, for example, Japanese Patent Publication No. 47-43450 and
As disclosed in Japanese Patent No. 50-60131, etc., the timing of applying the charging voltage to the charging electrode is determined appropriately by searching for the appropriate charging phase of the ink particles. For this reason, in the past, photoelectric sensors have been used to detect when charged ink particles fly along predetermined trajectories, or electrostatic induction has been used to detect the charge of ink particles, or detection electrodes have been used on predetermined trajectories. When a charged ink particle is arranged and collides with the detection electrode, a change in the potential of the detection electrode is detected, thereby detecting whether or not the ink particle has a desired charge. However, with these conventional charge detection methods, there is a problem that when using a photoelectric sensor, the S/N is low because the ink particles are extremely small in diameter, and when using electrostatic induction, the amount of charge on the ink particles is still small. There is a problem in that the S/N ratio is low, and although it is possible to detect charged and uncharged states, it is impossible to detect the amount of charge.When using a detection electrode where ink particles collide, There is a problem in that the amount of charge given to the detection electrode is small and it is difficult to accurately detect the amount of charge.
特に、光電センサーや荷電検出電極を荷電電極
からガターまでのインク粒子の飛翔路のある地点
の側方に配置する場合、それらを配置するスペー
スが必要なため、インク飛翔路を長くせざるを得
ず、これにより印写位置ずれが大きくなるという
問題もある。 In particular, when placing a photoelectric sensor or charge detection electrode on the side of a certain point on the ink droplet flight path from the charged electrode to the gutter, space is required to place them, so the ink flight path must be made longer. First, there is also the problem that this increases the printing position deviation.
本発明は、インク粒子の飛翔路に特別な検出手
段を配置する必要をなくし、しかも、荷電量の検
出を正確にして位相検索を正確にすることを目的
とする。 SUMMARY OF THE INVENTION An object of the present invention is to eliminate the need to arrange a special detection means in the flight path of ink particles, and to accurately detect the amount of charge and perform phase retrieval.
この目的を達成するために本発明においては、
非印写インク粒子を捕獲するガターを電気的に他
の要素と絶縁してそれに積分回路を接続し、該積
分回路に、比較器と、該積分回路の積分出力を初
期化するリセツトスイツチング手段と、を接続
し、位相検索時には、偏向電極間の電界を零もし
くは荷電インク粒子をガターの方向に偏向するも
のに変更し、前記リセツトスイツチング手段を一
時的に導通として前記積分出力を初期化してから
所定時間後のタイミングで前記比較器の出力を参
照し、それが適正荷電を示す信号でないと、ノズ
ルより噴射されたインクのインク粒子への分離と
荷電電極への荷電電圧の印加との相対的なタイミ
ングを所定分ずらし前記リセツトスイツチング手
段を一時的に導通として前記積分回路をリセツト
しこれより所定時間後のタイミングで前記比較器
の出力を参照し、前記比較器の出力が適正荷電を
示すものとなるまで、前記相対的なタイミングの
所定分のずらし、前記積分回路のリセツトおよび
該リセツトより所定時間後のタイミングでの前記
比較器の出力の参照を繰り返す。 In order to achieve this purpose, in the present invention,
A gutter for capturing non-imprinted ink particles is electrically insulated from other elements and an integrating circuit is connected thereto, and the integrating circuit includes a comparator and reset switching means for initializing the integrated output of the integrating circuit. and during phase search, the electric field between the deflection electrodes is changed to zero or one that deflects the charged ink particles in the direction of the gutter, and the reset switching means is temporarily made conductive to initialize the integral output. After a predetermined period of time, the output of the comparator is referred to, and if the output is not a signal indicating proper charging, separation of the ink ejected from the nozzle into ink particles and application of a charging voltage to the charging electrode are performed. The relative timing is shifted by a predetermined amount, the reset switching means is temporarily turned on, the integration circuit is reset, and the output of the comparator is referred to at a timing after a predetermined period of time, and the output of the comparator is properly charged. Shifting the relative timing by a predetermined amount, resetting the integrating circuit, and referring to the output of the comparator at a timing a predetermined time after the reset are repeated until the relative timing is obtained.
このように、積分回路はリセツトするものとし
ているので、その定常放電時定数は積分時の放電
が極く少い高値又は無限大に設定することがで
き、したがつてガターに衝突した荷電インク粒子
の電荷の蓄積速度が高く、その分適正荷電量検出
が正確となる。また、積分回路のリセツトから所
時間後のタイミングで、比較器の適正荷電量有無
信号を参照するので、常に初期値一定、積分時間
一定の、定条件で荷電量判定が行なわれるので、
荷電量検出が正確である。位相検索における位相
設定は荷電検出に従つて行なわれるので、上述の
ように荷電検出が正確である結果、位相設定も正
確となる。更に、従来より必要とされるガターを
利用してインク粒子の荷電／非荷電を検出するの
で、付加要素は少く、ノズルと記憶紙の間のイン
ク飛翔路を長くする必要はない。 Since the integrating circuit is assumed to be reset in this way, its steady-state discharge time constant can be set to a high value that causes very little discharge during integration, or to infinity, so that the charged ink particles that hit the gutter The rate of charge accumulation is high, and the appropriate amount of charge can be detected more accurately. In addition, since the appropriate charge amount presence/absence signal of the comparator is referred to at a certain time after the integration circuit is reset, the charge amount determination is always performed under fixed conditions such as a constant initial value and constant integration time.
Charge amount detection is accurate. Since phase setting in phase search is performed in accordance with charge detection, as described above, as a result of accurate charge detection, phase setting also becomes accurate. Furthermore, since the conventionally required gutter is used to detect charged/uncharged ink particles, there are few additional elements and there is no need to lengthen the ink flight path between the nozzle and the storage paper.
本発明の他の目的および特徴は、図面を参照し
た以下の実施例の説明より明らかになろう。 Other objects and features of the present invention will become apparent from the following description of embodiments with reference to the drawings.
以下図面に基づいて本発明の実施例を説明す
る。第１図に本発明を実施する１つのインクジエ
ツト印写装置の構成を示す。第１図においては１
はインク槽、２はフイルタ、３はポンプ、４はア
キユムレータ、５はインク噴射ノズル、７は荷電
電極、９は偏向電極、１０はガター、１１は記録
紙である。インク槽１のインクはフイルタ２を通
してポンプ３で吸引されてアキユムレータ４に入
る。アキユムレータ４内には気体が封入されてお
り、この気体がポンプ３の吐出圧の脈動を吸収す
るので、ノズル５には一定圧力のインクが供給さ
れ、ノズル５よりインクが噴出する。この噴射イ
ンクがインク粒子に分離する位置に荷電電極７が
配置されており、このインク粒子の形成タイミン
グに合わせて、荷電電極７に印写信号に応じて荷
電電圧が印加される。このようにして荷電された
インク粒子は、偏向電極９の電界で偏向されて記
録紙１１に衝突し、荷電しなかつたインク粒子は
直進してガター１０で捕獲される。ガター１０内
に捕獲されたインクはまたはフイルタ２に至る。
偏向電極９には、偏向電圧電源１２より常時一定
の偏向電圧が印加されている。ノズル５の超音波
振動子には、一定電圧、一定周波数の交流又は脈
流が増幅器１３より印加され、これにより、その
周波数でノズル５の超音波振動子が振動し、ノズ
ル内のインクにその振動が加わる。この振動によ
り、荷電電極７部において、インク柱が切れて上
記周波数に相当する速度（個数／sec）でインク
粒子が生成される。励振基準波は、クロツクパル
ス発振器１４のクロツクパルスに同期して励振信
号発生器１５が発生する。クロツクパルスは荷電
信号発生回路１６および検索信号発生回路１７に
も印加される。荷電信号発生回路１６は、クロツ
クパルスに同期して、段階的にその波高が順次に
上昇又は下降し、所定のパルス毎に定周期でこれ
ご繰り返す荷電パルスを発生するものである。こ
の段階的な波高の変化により、記録紙の送り方向
（第１図においては上から下、又はその逆：副走
査）の印写位置が定まる。なお、ノズル５〜ガタ
ー１０は、連続的に一定速度で紙面の裏側から表
側に走査駆動（主走査）され、その末端まで行く
と始端まで復帰駆動されて、また主走査駆動され
る。一主走査毎に記録紙は副走査方向に１行分送
られる。 Embodiments of the present invention will be described below based on the drawings. FIG. 1 shows the configuration of one inkjet printing device embodying the present invention. In Figure 1, 1
2 is an ink tank, 2 is a filter, 3 is a pump, 4 is an accumulator, 5 is an ink jet nozzle, 7 is a charging electrode, 9 is a deflection electrode, 10 is a gutter, and 11 is a recording paper. Ink in the ink tank 1 is sucked by a pump 3 through a filter 2 and enters an accumulator 4. Gas is sealed in the accumulator 4, and this gas absorbs the pulsation of the discharge pressure of the pump 3, so that ink at a constant pressure is supplied to the nozzle 5, and the ink is ejected from the nozzle 5. A charging electrode 7 is disposed at a position where the ejected ink is separated into ink particles, and a charging voltage is applied to the charging electrode 7 in accordance with a printing signal in synchronization with the timing of formation of the ink particles. The ink particles thus charged are deflected by the electric field of the deflection electrode 9 and collide with the recording paper 11, while the uncharged ink particles travel straight and are captured by the gutter 10. The ink trapped within the gutter 10 then reaches the filter 2.
A constant deflection voltage is always applied to the deflection electrode 9 from a deflection voltage power source 12 . An alternating current or pulsating current of a constant voltage and a constant frequency is applied from the amplifier 13 to the ultrasonic vibrator of the nozzle 5, and as a result, the ultrasonic vibrator of the nozzle 5 vibrates at that frequency, causing the ink in the nozzle to vibrate. Adds vibration. Due to this vibration, the ink column breaks in the charging electrode 7 portion, and ink particles are generated at a speed (number/sec) corresponding to the above frequency. The excitation reference wave is generated by an excitation signal generator 15 in synchronization with the clock pulses of a clock pulse oscillator 14. The clock pulse is also applied to charge signal generation circuit 16 and search signal generation circuit 17. The charging signal generating circuit 16 generates a charging pulse whose wave height sequentially rises or falls step by step in synchronization with a clock pulse, and repeats this at a regular cycle for each predetermined pulse. This stepwise change in wave height determines the printing position in the feeding direction of the recording paper (from top to bottom in FIG. 1, or vice versa: sub-scanning). The nozzles 5 to gutter 10 are continuously driven to scan (main scan) from the back side of the page to the front side at a constant speed, and when they reach the end, they are returned to the starting end and are driven again in the main scan. The recording paper is fed by one line in the sub-scanning direction for each main scan.
荷電信号発生回路１６の出力パルスは、切換回
路１８を介して位相設定回路１９に印加される。
位相設定回路１９は、記憶モードにおいては、位
相検索モード時に設定された位相に荷電パルスの
位相を調整して荷電制御回路２０に与えるが、位
相検索モード（このモードでは、荷電パルスと同
位相の、波高値が一定の検索パルスが切換回路１
８を介して位相設定回路に与えられる。）におい
ては、検索パルスの位相を、荷電検出回路２１よ
り適正荷電検出信号が得られるまで順次にずら
し、該適正荷電検出信号が現われると、そのとき
の位相に固定するものであり、検索指令信号が到
走することにより、１サイクルの位相検索動作を
開始する。荷電制御回路２０は、画信号があると
き、つまり印字を表わす信号があるときに荷電パ
ルスを増幅器２２に出力し、画信号がないときに
は、荷電パルスを遮断し、増幅器２２には与えな
い。 The output pulse of the charge signal generation circuit 16 is applied to the phase setting circuit 19 via the switching circuit 18.
In the storage mode, the phase setting circuit 19 adjusts the phase of the charging pulse to the phase set in the phase search mode and provides it to the charging control circuit 20; , the search pulse with a constant peak value is the switching circuit 1.
8 to the phase setting circuit. ), the phase of the search pulse is sequentially shifted until a proper charge detection signal is obtained from the charge detection circuit 21, and when the proper charge detection signal appears, it is fixed at the phase at that time, and the search command signal is Upon arrival, one cycle of phase search operation is started. The charge control circuit 20 outputs a charge pulse to the amplifier 22 when there is an image signal, that is, when there is a signal representing printing, and when there is no image signal, the charge control circuit 20 cuts off the charge pulse and does not supply it to the amplifier 22.
要約すると、記録モードにおいては切換回路１
８が荷電パルスを位相設定回路１９に与え、イン
ク粒子の偏向量（幅走査方向）は荷電パルスの波
高値で定まり、位相設定回路１９がインク粒子の
生成に対して、荷電パルスの位相をインク粒子を
最も適切に荷電するための荷電電圧位相に調整
し、荷電制御回路２０が印写をなすか否かを定め
る。位相検索モードにおいては、切換回路１８は
検索パルスを位相設定回路１９に与え、このパル
スの波高値が一定であることによりインク粒子の
偏向量は一定であり（但し適正に荷電していると
き）、位相設定回路１９が荷電検出回路２１より
適正荷電検出信号が発せられるまで荷電パルスの
位相を順次にずらし、それが発せられるときの位
相に荷電電圧（パルス）の位相を固定する。 To summarize, in recording mode, switching circuit 1
8 applies a charging pulse to a phase setting circuit 19, the amount of deflection of the ink droplet (width scanning direction) is determined by the peak value of the charging pulse, and the phase setting circuit 19 sets the phase of the charging pulse to the ink droplet generation. The charging voltage phase is adjusted to most appropriately charge the particles, and the charge control circuit 20 determines whether or not to print. In the phase search mode, the switching circuit 18 applies a search pulse to the phase setting circuit 19, and since the peak value of this pulse is constant, the amount of deflection of the ink particles is constant (provided that they are properly charged). , the phase setting circuit 19 sequentially shifts the phase of the charging pulse until the charge detection circuit 21 issues an appropriate charge detection signal, and fixes the phase of the charging voltage (pulse) to the phase when the appropriate charge detection signal is issued.
以上に説明した各構成要素およびそれらの動作
はすでに提案されているものである。次に本発明
に基づいて付加された部分を説明する。第１図に
おいて、ガダー１０は導電体で作られており、イ
ンク回収パイプとは分離され、絶縁台１０ｂで支
持されている。したがつてガダー１０で補獲され
たインクは、パイプ１０ａに滴下し、ガター１０
とパイプ１０ａの間にインクの連続流は形成され
ない。ガター１０には、荷電検出回路２１が接続
されており、この荷電検出回路２１は積分回路８
と、比較器８ｄおよび放電用の電界効果型トラン
ジスタ８ｅで構成されている。積分回路８は、本
例では電界効果型トランジスタ（FET）８ａ、
演算増幅器８ｂおよび積分用のコンデンサ８ｃで
構成され、積分回路８の出力は比較器８ｄの一入
力端に印加されて基準電圧と比較される。比較器
８ｄは、積分回路８の出力電圧レベルが基準電圧
以上となると高レベル「１」の出力を生ずる。位
相検索制御装置２３は、検索指令信号を発しかつ
FET８ｅをタイミング信号１で一瞬オンとして
コンデンサ８ｃを放電させてから所定時間（たと
えば一周期10μsecのサイン波励振信号の２π／
８づつ位相をずらして位相検索をする場合、１位
相について200個のインク粒子を割り当てるとす
ると、200×10μsec＝2000μsec）の後にタイミ
ング信号２を発つし、このとき比較器８ｄの出力
が「１」であるとアンドゲートAND１の出力が
「１」となり、適正荷電検出信号として荷電制御
回路２０に印加される。位相設定回路１９は前述
の通り、適正荷電検出信号「１」が現われると、
そのときの検索位相に、以後の荷電電圧位相を固
定する。位相検索制御装装置２３は、適正荷電検
出信号「１」が到来すると検索指令および検索信
号を低レベル「０」に戻して位相検索を終了とす
る。検索指令が低レベル「０」となると、切換回
路１８は荷電信号発生回路１６の出力を位相設定
回路１９に与える印写モードに切換わる。前記所
定の時間の後にタイミン信号２を発つしたときに
アンドゲート１の出力が「０」であると、位相検
索制御装置２３は再度タイミング信号１を発つし
てFET８ｅをオンとして積分回路８をリセツト
し、位相設定回路１９に１ステツプの位相（２
π／８）のシフトを指令し、前記所定時間の後に
タイミング信号２を発する。そしてアンドゲート
AND１より、タイミング信号２を発したときに
「１」の出力が現わるまでこれを繰り返す。 The components and their operations described above have already been proposed. Next, parts added based on the present invention will be explained. In FIG. 1, the girder 10 is made of a conductive material, is separated from the ink recovery pipe, and is supported by an insulating stand 10b. Therefore, the ink captured by the gutter 10 drips into the pipe 10a and flows into the gutter 10.
A continuous flow of ink is not formed between the pipe 10a and the pipe 10a. A charge detection circuit 21 is connected to the gutter 10, and this charge detection circuit 21 is connected to an integration circuit 8.
, a comparator 8d, and a field effect transistor 8e for discharging. In this example, the integrating circuit 8 includes a field effect transistor (FET) 8a,
It consists of an operational amplifier 8b and an integrating capacitor 8c, and the output of the integrating circuit 8 is applied to one input terminal of a comparator 8d and compared with a reference voltage. The comparator 8d produces an output of high level "1" when the output voltage level of the integrating circuit 8 becomes equal to or higher than the reference voltage. The phase search control device 23 issues a search command signal and
The FET 8e is momentarily turned on by the timing signal 1, the capacitor 8c is discharged, and then a predetermined period of time (for example, 2π/
When performing a phase search by shifting the phase by 8, and assuming that 200 ink particles are assigned to one phase, timing signal 2 is issued after 200 x 10 μsec = 2000 μsec), and at this time, the output of comparator 8d is “1”. ”, the output of the AND gate AND1 becomes “1” and is applied to the charge control circuit 20 as an appropriate charge detection signal. As mentioned above, when the appropriate charge detection signal "1" appears, the phase setting circuit 19
The charging voltage phase thereafter is fixed to the search phase at that time. When the appropriate charge detection signal "1" arrives, the phase search control device 23 returns the search command and the search signal to the low level "0" and ends the phase search. When the search command becomes a low level "0", the switching circuit 18 switches to a printing mode in which the output of the charge signal generating circuit 16 is applied to the phase setting circuit 19. If the output of the AND gate 1 is "0" when the timing signal 2 is issued after the predetermined time, the phase search control device 23 issues the timing signal 1 again, turns on the FET 8e, and resets the integration circuit 8. Then, the phase setting circuit 19 inputs the phase of 1 step (2 steps).
A shift of π/8) is commanded, and a timing signal 2 is issued after the predetermined time. and and gate
This process is repeated until an output of "1" appears when timing signal 2 is issued from AND1.
検索指令「１」がある間、リレー付勢回路２４
が付勢されて、偏向電圧電源１２と偏向電極９の
間に介挿された高圧リレー２５を開としている。
これにより、位相検索の間は偏向電界が零であ
り、荷電インク粒子および非荷電インク粒子のい
ずれも直進してガター１０で捕獲され、荷電イン
ク粒子がガター１０に衝突したときに、ガター１
０に接続された積分回路８の入力端の電位が上昇
する。偏向電圧電源１２において、１２ａは変圧
器、１２ｂは、偏向電極間に異常放電を生じたと
きなど、変圧器２次巻線の電流が増大したときに
変圧器１次巻線の電流の増大を阻止する限流抵抗
である。簡単に言えば抵抗１２ｂは、変圧器１２
ａの２次側短絡の場合に、変圧器１次側の回路を
保護する。 While there is a search command “1”, the relay energizing circuit 24
is energized, opening the high voltage relay 25 interposed between the deflection voltage power supply 12 and the deflection electrode 9.
As a result, the deflection electric field is zero during the phase search, both charged and uncharged ink particles travel straight and are captured by the gutter 10, and when the charged ink particles collide with the gutter 10, the deflection field is zero.
The potential at the input end of the integrating circuit 8 connected to 0 rises. In the deflection voltage power supply 12, 12a is a transformer, and 12b is a transformer for increasing the current in the primary winding of the transformer when the current in the secondary winding of the transformer increases, such as when abnormal discharge occurs between the deflection electrodes. It is a current limiting resistor that blocks Simply put, the resistor 12b is the transformer 12
Protects the circuit on the primary side of the transformer in the event of a short circuit on the secondary side of a.
上記実施例においては、偏向電圧電源１２の出
力側に高圧リレー２５を接続しているが、第２図
に示すように、偏向電圧電源１２の入力側に低圧
リレー２６を介挿して、これをリレー付勢回路２
４で開閉制御するようにしてもよい。 In the above embodiment, the high voltage relay 25 is connected to the output side of the deflection voltage power source 12, but as shown in FIG. Relay energizing circuit 2
4 may be used to control opening and closing.
いずれにしても、本発明によれば位相検索時に
荷電インク粒子をガター１０で捕獲すればよいの
で、荷電インク粒子がガター１０で捕獲されるレ
ベルおよび／又は極性に偏向電極９間の電圧を設
定すればよい。この意味から、切換スイツチタイ
プの高圧リレーを偏向電圧電源１２と偏向電極９
間に接続し、位相検索時には、印写記録時の電圧
極性とは逆極性の電圧を偏向電極９間に加えるよ
うにしてもよい。 In any case, according to the present invention, charged ink particles need only be captured by the gutter 10 during phase search, so the voltage between the deflection electrodes 9 is set to a level and/or polarity at which the charged ink particles are captured by the gutter 10. do it. In this sense, a changeover switch type high voltage relay is connected to the deflection voltage power supply 12 and the deflection electrode 9.
A voltage having a polarity opposite to the voltage polarity during printing and recording may be applied between the deflection electrodes 9 during phase retrieval.
また上記説明においては、１つのインク噴射ノ
ズルに１組の偏向電極およびガターを割り当てた
インクジエツト印写装置を例示したが、多数のイ
ンク噴射ノズルに対して１組の偏向電極と１個の
ガターを共通に割り当てるマルチノズルタイプの
インクジエツト印写装置にも同様に本発明を実施
しうる。この場合には、ノズル１個毎に前述の位
相検策をおこない、位相検索としていないノズル
については、それに割り当てられた荷電電極への
荷電電圧の印加を停止しておけばよい。 Furthermore, in the above description, an ink jet printing device in which one set of deflection electrodes and a gutter are assigned to one ink jet nozzle is illustrated, but one set of deflection electrodes and one gutter are assigned to a large number of ink jet nozzles. The present invention can be similarly applied to a multi-nozzle type inkjet printing device that is commonly assigned. In this case, it is sufficient to perform the above-mentioned phase detection for each nozzle, and to stop applying the charging voltage to the charging electrode assigned to the nozzle for which the phase search is not being performed.
以上の通り本発明は、従来より必要とされるガ
ターを利用して、それに積分回路を接続し該積分
回路にリセツトスイツチング手段と比較器を接続
して、積分回路をリセツトしてから所定時間後に
比較器の出力でインク粒子の適正荷電を見る。こ
のように積分回路はリセツトするものとしている
ので、その定常放電時定数は積分時の放電が極く
少い高値又は無限大に設定することができ、した
がつてガターに衝突した荷電インク粒子の電荷の
蓄積速度が高く、その分適正荷電量検出が正確と
なる。また、積分回路のリセツトから所定時間後
のタイミングで、比較器の適正荷電量有無信号を
参照するので、常に初期値一定、積分時間一定
の、定条件で荷電量判定が行なわれるので、荷電
量検出が正確である。位相検索における位相設定
は荷電検出に従つて行なわれるので、上述のよう
に荷電検出が正確である結果、位相設定も正確と
なる。更に、従来より必要とされるガターを利用
してインク粒子の荷電／非荷電を検出するので、
付加要素は少く、ノズルと記録紙の間のインク飛
翔路を長くする必要はない。 As described above, the present invention utilizes a conventionally required gutter, connects an integrating circuit to it, connects a reset switching means and a comparator to the integrating circuit, and resets the integrating circuit for a predetermined period of time. Later, the output of the comparator is used to check the proper charge of the ink particles. Since the integrating circuit is assumed to be reset in this way, its steady-state discharge time constant can be set to a high value that causes very little discharge during integration, or to an infinite value, so that the charged ink particles that hit the gutter can be The rate of charge accumulation is high, and the appropriate amount of charge can be detected more accurately. In addition, since the appropriate charge amount presence/absence signal of the comparator is referred to at a timing a predetermined time after the integration circuit is reset, the charge amount is always determined under fixed conditions such as a constant initial value and a constant integration time. Detection is accurate. Since phase setting in phase search is performed in accordance with charge detection, as described above, as a result of accurate charge detection, phase setting also becomes accurate. Furthermore, since it detects whether the ink particles are charged or uncharged by using the conventionally required gutter,
There are few additional elements, and there is no need to lengthen the ink flight path between the nozzle and the recording paper.
第１図は本発明を一態様で実施するインクジエ
ツト印写装置を示すブロツク図、第２図はその一
部の変形例を示す電気回路図である。
１：インク槽、２：フイルタ、３′：ポンプ、
４：アキユムレータ、５：ノズル、７：荷電電
極、８：積分回路、８ｄ：比較器、８ｅ：FET
（リセツトスイツチング手段）、９：偏向電極、１
０：ガター、１１：記録紙、１２：偏向電圧電
源、２１：荷電検出回路、２５：高圧リレー、２
６：低圧リレー。
FIG. 1 is a block diagram showing an inkjet printing apparatus embodying the present invention in one embodiment, and FIG. 2 is an electric circuit diagram showing a partial modification thereof. 1: Ink tank, 2: Filter, 3': Pump,
4: Accumulator, 5: Nozzle, 7: Charged electrode, 8: Integrating circuit, 8d: Comparator, 8e: FET
(Reset switching means), 9: Deflection electrode, 1
0: Gutter, 11: Recording paper, 12: Deflection voltage power supply, 21: Charge detection circuit, 25: High voltage relay, 2
6: Low voltage relay.
Claims (1)
位相検索により、該ノズルより噴射されたインク
のインク粒子への分離と荷電電極への荷電電圧の
印加との相対的なタイミングを設定した後、荷電
電極に該タイミングで記録荷電電圧を印加して荷
電インク粒子を形成し、荷電インク粒子を偏向電
極間の所定電界で偏向させて記録紙に印写するイ
ンクジエツト印写装置において、 非印写インク粒子を捕獲するガターを電気的に
他の要素と絶縁してそれに積分回路を接続し、該
積分回路に、比較器と、該積分回路の積分出力を
初期化するリセツトスイツチング手段と、を接続
し、 前記位相検索時には、偏向電極間の電界を零も
しくは荷電インク粒子をガターの方向に偏向する
ものに変更し、前記リセツトスイツチング手段を
一時的に導通として前記積分出力を初期化してか
ら所定時間後のタイミングで前記比較器の出力を
参照し、それが適正荷電を示す信号でないと、前
記ノズルより噴射されたインクのインク粒子への
分離と荷電電極への荷電電圧の印加との相対的な
タイミングを所定分ずらし前記リセツトスイツチ
ング手段を一時的に導通として前記積分回路をリ
セツトしこれより所定時間後のタイミングで前記
比較器の出力を参照し、前記比較器の出力が適正
荷電を示すものとなるまで、前記相対的なタイミ
ングの所定分のずらし、前記積分回路のリセツト
および該リセツトより所定時間後のタイミングで
の前記比較器の出力の参照を繰り返す、インクジ
エツト印写装置における位相検索方法。[Claims] 1. Pressurized ink is ejected from an ink ejection nozzle,
After setting the relative timing between the separation of the ink ejected from the nozzle into ink particles and the application of the charging voltage to the charging electrode by phase search, a recording charging voltage is applied to the charging electrode at the timing. In an inkjet printing device that forms charged ink particles and prints them on recording paper by deflecting them with a predetermined electric field between deflection electrodes, a gutter that captures non-printed ink particles is electrically connected to another element. A comparator and reset switching means for initializing the integrated output of the integrating circuit are connected to the integrating circuit, and the electric field between the deflection electrodes is insulated and connected to the integrating circuit. The output of the comparator is referred to at a predetermined time after initializing the integral output by temporarily turning on the reset switching means by deflecting zero or charged ink particles in the direction of the gutter. If the signal does not indicate proper charging, the relative timing between the separation of the ink ejected from the nozzle into ink particles and the application of the charging voltage to the charging electrode is shifted by a predetermined amount, and the reset switching means is temporarily activated. The integration circuit is reset as conduction, and the output of the comparator is referred to at a timing after a predetermined period of time, and the output of the comparator is reset for a predetermined period of the relative timing until the output of the comparator indicates proper charging. 2. A phase search method in an inkjet printing device, which repeats shifting of the integrator, resetting the integrating circuit, and referring to the output of the comparator at a timing a predetermined time after the reset.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10063079A JPS5624175A (en) | 1979-08-07 | 1979-08-07 | Charge detection of ink particles for ink jet transfer printing apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10063079A JPS5624175A (en) | 1979-08-07 | 1979-08-07 | Charge detection of ink particles for ink jet transfer printing apparatus |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5624175A JPS5624175A (en) | 1981-03-07 |
| JPS6234552B2 true JPS6234552B2 (en) | 1987-07-28 |
Family
ID=14279150
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10063079A Granted JPS5624175A (en) | 1979-08-07 | 1979-08-07 | Charge detection of ink particles for ink jet transfer printing apparatus |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5624175A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4418352A (en) * | 1981-05-18 | 1983-11-29 | Ricoh Company, Ltd. | Ink jet printing apparatus |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS49107142A (en) * | 1973-02-13 | 1974-10-11 | ||
| JPS5082935A (en) * | 1973-11-24 | 1975-07-04 | ||
| JPS5185636A (en) * | 1974-12-16 | 1976-07-27 | Ibm | |
| JPS5584680A (en) * | 1978-12-22 | 1980-06-26 | Toppan Printing Co Ltd | Method and apparatus for controlling charging phase in ink jet printer |
-
1979
- 1979-08-07 JP JP10063079A patent/JPS5624175A/en active Granted
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS49107142A (en) * | 1973-02-13 | 1974-10-11 | ||
| JPS5082935A (en) * | 1973-11-24 | 1975-07-04 | ||
| JPS5185636A (en) * | 1974-12-16 | 1976-07-27 | Ibm | |
| JPS5584680A (en) * | 1978-12-22 | 1980-06-26 | Toppan Printing Co Ltd | Method and apparatus for controlling charging phase in ink jet printer |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5624175A (en) | 1981-03-07 |
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