CN100496981C - Ink jet head, control method therefor, and ink jet recording apparatus - Google Patents

Ink jet head, control method therefor, and ink jet recording apparatus Download PDF

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CN100496981C
CN100496981C CN 200510099996 CN200510099996A CN100496981C CN 100496981 C CN100496981 C CN 100496981C CN 200510099996 CN200510099996 CN 200510099996 CN 200510099996 A CN200510099996 A CN 200510099996A CN 100496981 C CN100496981 C CN 100496981C
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ink
electrode
voltage
discharge
applied
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CN1749009A (en )
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中泽雄祐
古川弘司
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富士胶片株式会社
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Abstract

提供一种在记录介质上形成图像的喷墨头、其控制方法和喷墨记录装置。 It provided an ink-jet head forming an image on a recording medium, a control method and an ink jet recording apparatus. 所述喷墨头具有:形成了喷出所述墨滴的多个喷出口的喷出口基板(16);与所述喷出口基板的所述多个喷出口分别对应形成,用于在所述多个喷出口上生成静电场的喷出电极(18);为了遮挡从相邻的所述喷出电极产生的电场,在相邻的所述喷出口之间,在比所述喷出电极更靠墨水喷出一侧的位置上,以与所述喷出电极绝缘的状态下在所述喷出口基板上形成、并公共地控制的保护电极(20);在所述喷出电极上按照描画信号施加驱动电压,同时在所述保护电极上施加具有与施加在所述喷出电极上的驱动电压相同的频率、而且交替重复第一电压和比该第一电压更低电压的第二电压的交流偏压。 The ink-jet head having: a plurality of ejection ports are formed ejection port substrate (16) of the ink drops ejected; the ejection outlet and the substrate are formed corresponding to the plurality of ejection ports for the a plurality of discharge electrodes generating a discharge outlet of the electrostatic field (18); in order to block an electric field generated from the discharge electrode adjacent the, between the adjacent discharge outlet, the discharge electrode more than position on one side in the ink ejection, in the state where the discharge electrode is insulated from the discharge port is formed on the substrate, and protecting the common electrode (20) is controlled; discharge electrode in accordance with the drawing applying a driving voltage signal while applying a driving voltage applied on the discharge electrode on the same frequency as the guard electrode, and alternately repeating a first voltage and a second voltage lower voltage than the first voltage AC bias.

Description

喷墨头、其控制方法和喷墨记录装置 An inkjet head and an inkjet recording apparatus controlling method

技术领域 FIELD

本发明涉及用于向记录介质喷出墨水,在记录介质上形成图像的喷墨头、其控制方法和喷墨记录装置,更具体而言,涉及利用静电力使包含带电微粒的墨水喷出的喷墨头、其控制方法和喷墨记录装置。 The present invention relates to a recording medium for ejecting ink, an ink jet head forming an image on a recording medium, a control method and an inkjet recording apparatus, and more particularly, relates to using electrostatic ink containing charged fine particles is discharged an inkjet head and an inkjet recording apparatus control method.

背景技术 Background technique

知道利用静电力,向记录介质喷出墨水的静电式的喷墨记录方式。 Know using electrostatic force, the electrostatic ink jet recording ink is ejected to the recording medium. 在静电式喷墨记录方式中使用包含带电的微粒成分的墨水,对配置在用于喷出墨水的喷出口周围的喷出电极上施加驱动电压,使静电力作用于喷出口的墨水,从喷出口向记录介质喷出墨滴。 Used in electrostatic inkjet recording ink composition comprising charged particles, the configuration of the ejection driving voltage is applied on the electrode surrounding the ejection outlet for ejecting ink, an electrostatic force for ink ejection outlet, from the discharge exports to the recording medium eject ink droplets. 通过按照图像数据控制对喷出电极上施加的驱动电压,能在记录介质上记录与图像数据对应的图像。 By controlling the drive voltage applied to the discharge electrode in accordance with image data, an image corresponding to the image data can be recorded on the recording medium.

作为该静电式喷墨记录方式的记录装置中使用的喷墨头,已知在一个头中排列多个喷出口(通道)的多通道头。 As the ink jet head recording apparatus of this embodiment of the electrostatic type ink jet recording used in the known arrangement a plurality of discharge ports (channels) in a first multi-channel head. 为了使用多通道的静电式喷墨头以更高析像度进行记录,有必要以高密度配置喷出部,独立控制各喷出口。 In order to use an electrostatic type inkjet head multiple channels at a higher resolution printing, it is necessary to discharge portions arranged at a high density, independently controls each ejection outlet. 可是,在静电式喷墨头中,如上所述,利用通过在各喷出口的喷出电极上施加电压而产生的静电力,使墨滴喷出。 However, in the electrostatic ink-jet head, as described above, using an electrostatic force generated by a voltage applied to the discharge electrodes of the discharge port, ink droplets ejected. 因此,如果以高密度配置喷出口,在相邻的喷出口之间产生电场干涉,喷出的墨滴的和墨滴的尺寸或飞翔方向分散,存在无法进行正确的记录的问题。 Thus, if the discharge port arranged at a high density, an electric field interference between adjacent ejection outlet, and the size or the ink droplet flying direction of ink droplets ejected dispersion, the presence of the correct recording can not be a problem.

对于这样的问题,在专利文献l中公开了一种喷墨记录装置,在划分-墨水导向器的基板上设置多个喷出电极(个别电极),通过对喷出电极施加电压而引起的静电力从墨水导向器使墨滴喷出,在喷出电极间形成用于遮蔽来自相邻通道的电力线的屏蔽电极。 For such problem, disclosed in Patent Document l in an ink jet recording apparatus, the division - a plurality of discharge electrodes (individual electrode) on the substrate of the ink guides, a static voltage is applied to the discharge electrode caused by power allows ink droplet ejected from the guide, a shield electrode for shielding is formed from the power line between the adjacent channels of the discharge electrodes. 在该喷墨记录装置中,在屏蔽电极上,按照比喷出电极上施加的电压低但是与喷出电极之间不放电的程度施加高的电压,从而抑制相邻的喷出电极之间的干涉。 In the ink jet recording apparatus, the shield electrodes, and a high voltage is applied between the discharge electrodes of the discharge level is not in accordance with the voltage applied to the electrodes than the low discharge, thereby suppressing the discharge between the adjacent electrodes put one's oar in.

可是,在专利文献l的喷墨记录装置中,喷出电极和屏蔽电极设置在同一面上,所以屏蔽电极无法遮蔽从喷出电极的外周一恻的端部产生的电力线,无法有效地防止相邻的喷出口间的电场干涉。 However, in the ink jet recording apparatus in Patent Document l, the discharge electrode and the shield electrode disposed on the same plane, the shield electrode can not be generated from the power lines shield the outer end of the discharge electrode Monday sorrowful, can not be effectively prevented with the electric field between the discharge port adjacent interference.

另外,在相邻的喷出口之间宽度大地设置屏蔽电极对抑制电场干涉是有效的,但是专利文献1那样的在与喷出电极同一面上设置屏蔽电极的形态中,如果以高密度配置喷出口,就无法在相邻的喷出口之间确保屏蔽电极的充分宽度。 Further, the width between the adjacent discharge outlet earth shield electrode interference suppression field is effective, but in Patent Document 1 and the discharge electrode in the same plane in the form of a shield electrode, if configured as a high density spray outlet, can not ensure a sufficient width of shield electrodes between adjacent ejection outlet. 另外,如果为了在喷出口之间宽阔地设置屏蔽电极而使喷出部间隔宽阔,就会使喷出口的集成度下降,使头尺寸增大,这是所不优选的。 Further, if the shield electrode is provided to the wide discharge between the discharge outlet spaced wide, so that it will decrease the degree of integration of the discharge port, the head size is increased, and this is not preferable. 因此,存在难以用小型头进行正确的记录的问题。 Therefore, there is a problem is difficult to correct record with a small head.

[专利文献l]特开2000-25233号公报 [Patent Document L] Laid-Open Patent Publication No. 2000-25233

为了解决这样的问题,本申请人在特愿2003-90367号中公开了在形成喷出口的基板上在它们之间存在绝缘体层叠喷出电极和保护电极,使保护电极的内径比喷出电极的外径还小的喷墨头。 In order to solve this problem, the present applicant has disclosed in the present therebetween discharge port formed on the substrate in an insulator laminated Patent Application No. 2003-90367 discharge electrodes and a guard, the guard electrode than the inner diameter of the discharge electrode an outer diameter smaller ink jet head. 在特愿2003-90367号中公开的喷墨头中,因为保护电极的内径比喷出电极的外径还小,所以确保到本通道的电力线,能高效地遮蔽来自其他通道的电力线。 In Patent Application No. 2003-90367 disclosed an ink jet head, since the inner diameter of the protective electrode is smaller than the outer diameter of the discharge electrode, the power line to ensure that this channel can be efficiently shield the power line from other channels. 因此,即使在以高密度配置喷出口的多通道头中,也不削弱本通道的电场,能抑制其他通道的电场的影响,没有其他通道的工作状态引起的对墨滴尺寸和墨滴的飞翔方向的影响,防止记录点直径以及落下位置的变动,能以高精度进行高析像度的记录。 Accordingly, even when the ejection outlet disposed at a high density multi-channel head, nor weaken the electric field in this channel, the electric field can be suppressed the influence of other channels, no flying of the ink droplet size and droplet operation state due to the other channel impact direction, and to prevent the diameter of the recording dot landing position changes, it can be recorded in high resolution with high accuracy.

另外,本申请人在特愿2003-203824号中公开了为提高墨滴的喷出性, 在配置在记录介质的背面一侧的背面电极(对置电极)上施加AC偏压的喷墨记录装置。 Further, the present applicant Application No. 2003-203824 discloses to improve the ejection of ink droplets in Japanese, applying an AC bias on the back surface side of the recording medium disposed on the back surface of the electrode (counter electrode) of the ink jet recording device. 在该喷墨记录装置中,在背面电极上施加AC偏压,使作用于喷出口的墨水的力变化,从而促进墨水的弯液面的形成,提高喷出响应性。 In the ink jet recording apparatus, an AC bias is applied to the electrode on the back surface, change in force acting on the ink ejection port, to promote the formation of meniscus of the ink, improve the ejection responsivity. 另外,通过在背面电极上施加AC偏压,能总摇动喷出口内的墨水中包含的带电粒子,所以长时间从喷出口不喷出墨水时,也能防止墨水的过浓縮,防止喷出口的堵塞。 Further, by applying an AC bias to the back electrode, the charged particles can always shaking jet ink contained within the outlet, so that from the time when the discharge outlet is not ejecting ink, the ink can be prevented from excessively concentrated, to prevent the discharge port clogging.

另夕卜,为了使用静电式喷墨头,以高质量、高速度对记录介质描画图像,需要迅速对喷出部供给充分量的带电颜色材料粒子。 Another Bu Xi, in order to use an electrostatic type inkjet head, to high-quality, high-speed drawing of an image recording medium, it is necessary to quickly supply a sufficient amount of the charged color material particles to the discharge portion. 作为迅速对喷出部供给颜色材料粒子的方法,例如考虑到利用液流,.或通过电泳使颜色材料粒子向喷出口移动的方法。 As a method for rapidly feeding the particulate material to discharge color portion, e.g. consider the use of the flow,. Or by electrophoresis method of making a color material particles move to the discharge port.

可是,在这些方法中,可能产生不足以对喷出部迅速供给充分量的颜色材料粒子,或喷墨头的喷出口堵塞,或形成在记录介质上的点的分裂等问题。 However, in these methods, the problem may be insufficient to rapidly produce a sufficient amount of supply of the color material particles discharge portion, the discharge port or the ink jet head clogging or a split point is formed on the recording medium, and the like.

发明内容 SUMMARY

本发明是鉴于所述实际情况而提出的,本发明的第一目的在于:提4共在墨滴的喷出时迅速并且准确地对喷出口供给颜色材料粒子,能以高速并且稳定地描画,并且在不喷出墨滴时维持喷出口的墨水的浓縮性,防止墨水的不要的溢出,对于振动稳定的喷墨头、其控制方法和喷墨记录装置。 The present invention is proposed in view of the above circumstances, the first object of the present invention is: 4 were put quickly and accurately feed a color material particles to the discharge outlet when discharging ink droplets, can be drawn at a high speed and stably, and discharging an ink droplet is not maintained when the discharge outlet of the concentrated ink, do not prevent the overflow of ink, an ink jet head for stable vibration, a control method and an ink jet recording apparatus.

本发明的第二目的在于:提供防止墨滴的喷出延迟,能提高喷出动作结束后的墨滴的切断的喷墨头、具有它的喷墨记录装置以及喷墨头的控制方法。 The second object of the present invention is: providing a delay to prevent ejecting ink droplets, the ink droplet can be improved cut after completion of the discharge operation of the inkjet head having its control method and an ink jet recording apparatus of the ink jet head.

本发明的第三目的在于:提供能使施加在喷出电极上的驱动电压为低电压,使驱动电路为简易的构成,实现低成本的喷墨头、具有它的喷墨记录装置以及喷墨头的控制方法。 The third object of the present invention is: to provide a drive voltage can be applied on the discharge electrode to a low voltage, the driving circuit of simple configuration, low cost of the ink jet head, an ink jet recording apparatus with which the ink jet and a method of controlling head.

本发明者在形成喷出口的喷出口基板上具有保护电极和喷出电极的喷墨头中,在保护电极上施加300[V]的直流偏压,在喷出电极上按照描画 The present inventors jet head having a guard electrode and the discharge electrode formed on the substrate discharge outlet of the discharge port, applying 300 [V] DC bias on the guard electrode, the discharge electrode in accordance with the drawing

信号的on/off (接通/断开),施加例如600/0[V]时,由于由喷出电极和保护电极形成的电场,颜色材料粒子(包含颜料等的颜色材料,并且具有电荷的微粒)受到静电力,发现以下所示的效果。 on / off (ON / OFF), a signal is applied, for example, 600/0 [V], due to the electric field, the color material particles (pigment or the like comprising a color material, and is formed by the discharge electrode and a guard electrode having a charge fine particles) by an electrostatic force, the following effects are found.

在喷墨头的停止时,即不喷出墨水时,对喷出电极施加的驱动电压Vp (O[V]),比施加在保护电极上的直流偏压Vg (300[V])还低。 When the ink jet head is stopped, i.e., when no ink is ejected, the driving voltage applied to the discharge electrode Vp (O [V]), lower than the DC bias is applied Vg (300 [V]) on the guard electrode . 因此, 在喷出口形成基于分别施加在喷出电极和保护电极上的电压之电压差的电场。 Thus, in the discharge port is formed on the discharge electrode are applied voltage and the protection voltage difference between the electrodes on the field. 通过该电场对形成在喷出口上的墨水的弯液面作用与墨水的喷出方向相反的静电力,抑制弯液面。 By direction of the electric field on the discharge action of the ink meniscus formed in the ink discharge port of the opposing electrostatic force, suppression of the meniscus. 据此,抑制来自喷出口的墨水的溢出和不必要的墨滴喷出。 Accordingly, inhibition of overflow discharge and unnecessary ink droplets from the ink ejection port. - -

另一方面,在墨水的喷出时,施加在喷出电极上的驱动电压Vp(600[V]),比施加在保护电极上的直流偏压Vg (300[Vp还高。而且, 根据分别施加在喷出电极和保护电极上的电压之电压差,在喷出口形成电场,通、过该电场,在形成在喷出口上的墨水的弯液面作用向着墨水的喷出方向的静电力,开放该弯液面。因此,成为容易喷出墨水的状态。为解决上述课题,本发明的第一形态提供一种通过静电力使墨水的液滴喷出的喷墨头的控制方法,其中,所述喷墨头具有:形成喷出所述墨水之液滴的多个喷出口的喷出口基板;与所述喷出口基板的所述多个喷出口 On the other hand, when ejecting ink, a driving voltage Vp (600 [V]) on the discharge electrode, a DC bias voltage Vg is applied than on the guard electrode (300 [Vp is higher. Further, according to respectively the voltage applied to the discharge electrode and the voltage difference to the guard electrode, the electric field formed in the discharge port, through, through the electric field, acting on the meniscus formed on the discharge port toward the ink ejection direction of the ink of the electrostatic force, open the meniscus. Thus, a state of easy ejection of ink. in order to solve the above problems, a first aspect the present invention provides an electrostatic force by the ink droplet ejection control method for an ink jet head, wherein the ink-jet head having: a plurality of ejection ports ejecting the ink ejection port substrate of the droplets formed; said ejection outlet and the substrate a plurality of ejection outlet

分别对应形成,用于在所述多个喷出口上生成静电场的喷出电极;为了遮 Respectively forming discharge electrodes for generating an electrostatic field in said plurality of ejection outlet; To cover

挡从相邻的所述喷出电极产生的电场,在相邻的所述喷出口之间,在比所述喷出电极更靠墨水喷出一侧的位置,在与所述喷出电极绝缘的状态下形 Stop the discharge from the electric field generated by the electrode of the adjacent, adjacent said discharge outlet between, the discharge electrode at a position closer than the ink ejection side of the ejection electrode insulated shape in a state

成在所述喷出口基板上,公共控制的保护电极;对所述喷出电极按照描画信号施加驱动电压,同时对所述保护电极上施加具有与施加在所述喷出电极上的驱动电压相同的频率、而且交替重复第一电压和比该第一电压低的第二电压的交流偏压。 To discharge outlet on the substrate, a protective electrode common control; a driving voltage applied to the discharge electrode of the discharge electrodes is the same as applying a driving voltage signal in accordance with the drawing, while applying to said electrode protection frequency, and alternately repeating a first voltage and a lower voltage than the first AC bias voltage of a second.

在本发明的第一形态的喷墨头的控制方法中,优选所述第一电压为正电压,所述第二电压为负电压。 In the control method of the first aspect of the ink-jet head according to the present invention, preferably, the first voltage is a positive voltage, the second voltage is a negative voltage.

另外,在本发明的第一形态的喷墨头的控制方法中,优选施加所述交流偏压,以使对于在所述记录介质上形成1点时的所述驱动电压的信号成为反相。 Further, in the control method of the ink jet head of the first aspect of the present invention, the AC bias is preferably applied, so that one point for when the drive signal voltage is formed on the recording medium becomes inverted.

另外,优选对于在所述记录介质上形成1点时的所述驱动电压的信号, 相位以及脉冲宽度的至少一方不同地施加所述交流偏压。 Further, it is preferable for the one dot is formed on the medium when the driving signal, a phase and a pulse width of one of at least a different applied voltage in the alternating current bias recording. 这时,优选控制所述交流偏压的相位和脉冲宽度的至少一方,以使在所述喷出电极上施加所述驱动电压之前切换为所述偏压;并优选控制所述交流偏压的相位和脉冲宽度的至少一方,以使在向所述喷出电极的所述驱动电压的施加结束前切换为第一电压。 In this case, it is preferable to control the phase of the AC and a pulse width of at least one bias, such that said bias is applied prior to switching to the drive voltage to the discharge electrode; and controlling the AC bias is preferably phase and at least one of the pulse width, such that the voltage at the switch to a first end of the drive voltage to the discharge electrode is applied.

在本发明的第一形态中,所述墨水是把至少包含颜色材料的带电的微粒分散到绝缘性的分散介质中而构成的墨水。 In a first aspect of the present invention, the ink is charged fine particles containing at least the color of the ink material dispersed in an insulating dispersion medium constituted.

另外,为了解决所述课题,本发明的第二形态提供一种喷墨头,其利用静电力使包含带电微粒的墨滴喷出,在记录介质上记录图像,所述喷墨头具有:形成了喷出所述墨滴的多个喷出口的喷出口基板;与所述喷出口基板的所述多个喷出口分别对应形成,用于在各自的喷出口上生成电场的喷出电极;为了遮挡从相邻的所述喷出电极产生的电场,在相邻的所述喷出口之间,在比所述喷出电极更靠墨水喷出一侧的位置,在与所述喷出电极绝缘的状态下形成在所述喷出口基板上、并公共控制的保护电极;连接在所述保护电极上,对所述保护电极上一边控制一边施加具有与施加在所述喷出电极上的驱动电压相同的频率、且交替重复第一电压和比该第一电压低的第二电压的交流偏压的保护电极控制部。 Further, in order to solve the above problems, a second aspect the present invention provides an inkjet head using an electrostatic force ink droplets containing charged particles of the discharge, an image is recorded on a recording medium, the inkjet head comprising: forming a plurality of ejection ports ejecting the ink droplets ejection port substrate; a plurality of said ejection port substrate and said ejection port is formed respectively, for generating an electric field in the discharge on the respective discharge port; for shielding the electric field generated from the discharge electrode adjacent the, in between the adjacent discharge outlet, said discharge electrode at a position closer than the ink ejection side of the ejection electrode insulated in a state of the discharge port is formed on the substrate, and a common control electrode protection; connecting the protective electrode, is applied to the upper side of the control electrode protection while having a driving voltage is applied on the discharge electrode the same frequency, and alternately repeating a first voltage and a lower voltage than the first AC bias voltage of the second guard electrode control portion.

在本发明的第一形态的喷墨头的控制方法中,优选所述第一电压为正电压,所述第二电压为负电压。 In the control method of the first aspect of the ink-jet head according to the present invention, preferably, the first voltage is a positive voltage, the second voltage is a negative voltage.

在本发明的第二形态的喷墨头中,所述保护电极控制部对于在所述记录介质上形成1点时的所述驱动电压的信号成为反相地施加所述交流偏压。 In the ink jet head of the second aspect of the present invention, the guard electrode to the control unit when one point is formed on the medium becomes inverted drive signal voltage is applied to the bias of said alternating recording.

另外,在本发明的第二形态的喷墨头中,所述保护电极控制部对于在所述记录介质上形成1点时的所述驱动电压的信号,相位以及脉冲的至少一方不同地施加所述交流偏压。 Further, in the ink jet head of the second aspect of the present invention, the guard electrode control unit for applying to at least one of the difference of the driving voltage is formed at 1:00 on said signal recording medium, a phase and a pulse of said exchange bias. 这时,优选所述保护电极控制部控制所述交流偏压的相位和脉冲宽度的至少一方,以使在所述喷出电极上施加所述驱动电压之前将所述交流偏压切换为第二电压;并优选控制所述交流偏压的相位和脉冲宽度的至少一方,以使在向所述喷出电极的所述驱动电压的施加结束前将所述交流偏压切换为第一电压。 In this case, preferably, the guard electrode control section controls the phase of the AC bias voltage and at least one pulse width, so that prior to applying the driving voltage to the discharge electrode to the alternating bias is switched to the second voltage; and said AC bias voltage is preferably controlled phase and at least one of pulse width, so that at the end of the drive voltage to the discharge electrode is applied to the alternating bias is switched to a first voltage.

另外,在本发明的第二喷墨头中,所述墨水是把至少包含颜色材料的带电的微粒分散到绝缘性的分散介质中而构成的墨水。 Further, the second ink jet head of the present invention, the ink is charged fine particles containing at least the color of the ink material dispersed in an insulating dispersion medium constituted.

本发明的第三形态提供一种喷墨记录装置,该装置具备喷墨头和移动部件,其中: The third aspect of the present invention to provide an ink jet recording apparatus comprising an ink jet head and a movable member, wherein:

所述喷墨头利用静电力使包含带电微粒的墨滴喷出,在记录介质上记录图像,该喷墨头具有:形成了喷出所述墨滴的多个喷出口的喷出口基板; The ink jet head using electrostatic force to the ink droplets containing charged particles is ejected to record an image on a recording medium, the ink jet head having: a discharge port formed in the substrate of the ink droplets ejected plurality of ejection outlet;

与所述喷出口基板的所述多个喷出口分别对应形成,并用于在各自的喷出 And the ejection orifice substrate is formed respectively corresponding to the plurality of discharge ports, and a respective discharge for

口上生成电场的喷出电极;为了遮挡从相邻的所述喷出电极产生的电场, 在相邻的所述喷出口之间,在比所述喷出电极更靠墨水喷出一侧的位置, 在与所述喷出电极绝缘的状态下形成在所述喷出口基板上、并公共控制的保护电极;连接在所述保护电极上,并且将具有与施加在所述喷出电极上的驱动电压相同的频率、而且交替重复第一电压和比该第一电压低的第二电压的交流偏压,对所述保护电极上一边控制一边施加的保护电极控制部; Generating an electric field in the discharge port; an electric field in order to block the discharge electrode is generated from the adjacent, adjacent said discharge outlet between, closer to the ink ejection side than a position of the discharge electrode , in a state where the discharge electrode is insulated from the discharge port is formed on the substrate, and a protective electrode common control; and the protective electrode is connected, and having a drive applied on the discharge electrode the same voltage and frequency, and alternately repeating a first voltage and a lower voltage than the first AC bias voltage of a second, while controlling the protection guard electrode control portion applied to the side of the electrode;

所述移动部件用于使所述喷墨头和所述记录介质相对移动。 The means for moving the inkjet head and the recording medium relatively. 本发明的喷墨记录装置中,优选所述第一电压是正电压,所述第二电压是负电压。 The inkjet recording apparatus of the present invention, preferably, the first voltage is a positive voltage, the second voltage is a negative voltage. ' '

本发明的第一形态的喷墨头的控制方法,对保护电极一边控制一边施加与喷出电极上施加的驱动电压相同频率的交流偏压,在墨水的喷出时把墨水调整为容易喷出墨水的状态,在不喷出墨水时调整为难以喷出墨水的状态,所以能防止墨水的喷出延迟,并且能提高墨水喷出后的墨水的切断。 The method of controlling the ink jet head of the first aspect of the present invention, while the protection control electrode while applying an AC bias is applied to the same frequency as the driving voltage to the discharge electrode, the discharge ink to be easily adjusted at the time of discharging ink state of the ink, the ink is not discharged when the adjustment state is difficult to discharge the ink, it is possible to prevent the ink discharge delay, and can improve the cutting of the ink after ink is ejected. 另外,控制交流偏压,能独立调整墨水的喷出延迟和墨水的切断,所以能提高图像质量。 Further, an AC bias control, and can be adjusted independently of the ink discharge delay cutting the ink, it is possible to improve the image quality. 另外,即使施加在喷出电极上的驱动电压的电压值比以往低,也能可靠地控制墨水的喷出和不喷出。 Further, even when the voltage applied to the discharge electrode of the driving voltage is lower than before, it can be reliably controlled and non-ejection of ink ejection.

尤其是,将第一电压为正电压,所述第二电压为负电压的情况下,由于交替重复正电压和负电压而施加在保护电极上,所以当在喷出电极上施加驱动电压时,通过保护电极与喷出电极之间产生的电场,可以使墨水中的颜色材料粒子凝聚在喷出口的墨水表面上。 In particular, the case where the first voltage is a positive voltage, the second voltage is a negative voltage, due to the repeated alternating positive and negative voltages applied to the protective electrode, when the drive voltage is applied on the discharge electrode, by protecting an electric field generated between the electrode and the discharge electrode to make the color material particles agglomerated ink to the ink ejection port surface. 于是在喷出电极上没有施加驱动电压时,通过与保护电极和喷出电极之间产生的与所述电场相反的电场,抑止喷出口的墨水的弯液面使墨水难以喷出。 Thus when the drive voltage is not applied on the discharge electrode by the electric field generated between the opposing electrode and the discharge electrode and protection, to suppress the meniscus ejection outlet of the ink it is difficult to discharge the ink. 其结果,可以一边维持喷出口中的墨水的浓縮性, 一边防止来自喷出口的不要之墨水的溢出。 As a result, while maintaining the concentration of the ink ejection port, while not prevent overflow of the ink from the discharge port.

另外,本发明的第二形态的喷墨头和第三形态的喷墨记录装置,在保护电极控制部中,能一边控制一边对保护电极施加与在喷出电极上施加的驱动电压相同频率的交流偏压,所以在墨水的喷出时把墨水调整为容易喷出墨水的状态,在不喷出墨水时调整为难以喷出墨水的状态。 Further, the ink jet head and ink jet recording apparatus of the third embodiment of the second aspect of the present invention, the guard electrode in the control unit, while the control can be applied to the same side of the driving frequency voltage applied to the guard electrode to the discharge electrode AC bias, so that when the ink is ejected to adjust the ink discharge state of ink is easy, it is difficult to adjust the discharge state of ink when the ink is not discharged. 因此,能防止墨水的喷出延迟,并且能提高喷水喷出后的墨水的切断。 Thus, the delay can be prevented from ejecting ink, and the ink can be improved after the cutting water discharge. 另外,只通过设置控制对保护电极施加的交流偏压的保护电极控制部,就能比以往降低对喷出电极施加的驱动电压的电压值,能大幅度降低驱动电路的成本。 Further, only by setting the control unit controlling the protection guard electrode AC bias applied to the electrode, the discharge voltage value can reduce drive voltage applied to the electrodes than ever, can greatly reduce the cost of the driving circuit.

尤其是,通过保护电极控制部,若对保护电极施加具有对喷出电极施加的驱动电压相同的频率而且重复交替正电压和负电压的交流偏压(脉冲偏压),则在喷出电极上施加驱动电压时,通过保护电极与喷出电极之间产生的电场,可以使墨水中的颜色材料粒子凝聚在喷出口的墨水表面上。 In particular, by the guard electrode control portion, when applied to the guard electrodes have the same driving voltage and frequency applied to the discharge electrodes alternately repeating the positive and negative voltages of the AC bias (pulse bias), then the discharge electrode when the drive voltage is applied, by protecting the discharge electrode and the electric field generated between the electrodes, the color material particles can aggregate the ink to the ink ejection port surface. 于是在喷出电极上没有施加驱动电压时,通过与保护电极和喷出电极之间产生的所述电场相反的电场,抑止喷出口的墨水的弯液面、使墨水难以喷出。 Thus when the drive voltage is not applied on the discharge electrode, an electric field opposite to the electric field generated between the discharge electrode and the guard electrode, suppressing the meniscus ejection outlet of the ink, the ink ejection difficult. 其结果,可以一边维持喷出口中的墨水的浓縮性,一边防止来自喷出口的不要之墨水的溢出。 As a result, while maintaining the concentration of the ink ejection port, while not prevent overflow of the ink from the discharge port. 由此,可提供描画稳定性高、对振动等稳定的、 能够高速扫描的喷墨头及喷墨记录装置。 Thus, drawing can provide a high stability, the stability of the ink jet head and an ink jet recording apparatus capable of high speed scanning vibration or the like.

附图说明 BRIEF DESCRIPTION

下面简要说明附图。 BRIEF DESCRIPTION OF THE DRAWINGS.

图1 (A)是模式地表示本发明的喷墨头的剖视图,(B)是模式地表示喷出电极的平面构成的图。 FIG 1 (A) is a cross-sectional view of the ink jet head of the present invention showing a pattern, (B) schematically showing the plane configuration of the discharge electrode.

图2是模式地表示在喷墨头的喷出口基板上二维地排列多个喷出口的样子的图。 FIG 2 is a schematic showing a two-dimensionally arrayed a plurality of ejection outlets on the ejection outlet in the way of the ink jet head substrate of FIG. . .

图3是模式地表示多通道构造的喷墨头.的保护电极的平面构造的图。 FIG 3 is a schematic showing a configuration of a multi-channel ink-jet head. FIG planar structure of the guard electrode.

图4 (A)和(B)是用于说明图1 (A)所示的墨水诱导堰的构造的模式立体图及截面图。 FIG. 4 (A) and (B) is a 1 (A) schematic perspective view and a cross-sectional view of the ink inducing weir construction for explaining FIG.

图5是模式地表示根据本发明的喷墨头的控制方法中的、描画信号、 对喷出电极施加的驱动电压的电压波形、对保护电极施加的脉冲电压的电压波形的关系的图。 FIG 5 is a schematic showing a method of controlling an ink jet head according to the present invention, the drawing signal, the voltage waveform applied to the discharge electrode driving voltage, the relationship between FIG pulse voltage applied to the electrode protective voltage waveform.

图6 (A)是模式地表示对喷出电极施加驱动电压时的喷出口28的样子的图,(B)是模式地表示对喷出电极18不施加驱动电压时(或施加低电压时)的喷出口的样子的图。 FIG 6 (A) is a schematic view showing a state of the discharge outlet during the ejection driving voltage is applied to the electrode 28, (B) schematically showing a discharge electrode 18 of the driving voltage is not applied (or when a low voltage is applied) jet looks exports FIG.

图7是用于说明与图5所示的控制方法不同的控制方法的图,模式地表示描画信号、对喷出电极施加的驱动电压的电压波形、对保护电极施加的脉冲电压的电压波形的关系的图。 FIG 7 is a control method shown in FIG. 5 and FIG different control methods for describing the mode signal showing the drawing, the voltage waveform applied to the discharge electrode driving voltage, the voltage waveform of the pulse voltage applied to the guard electrode Figure relations.

图8 (A)是本发明的喷墨记录装置的一例的概念图,图S (B)是模式地表示头部件、其周围的记录介质P的输送部件的立体图。 FIG 8 (A) is a conceptual diagram showing an example of the ink jet recording apparatus according to the present invention, FIG. S (B) schematically showing a head member, a perspective view of a transport member of the recording medium P around it.

图中: Figure:

IO—喷墨头;12—头基板;14一墨水导向器;14a—顶端部分;16— IO- ink jet head; 12- head substrate; an ink guide 14; 14A-tip portion; 16-

喷出口基板;18^_喷出电极;20—保护电极;24—对置电极;24a—电极基板;24b—绝缘薄板;26a—高压带电器;26b—偏置电压源;28—各喷 Ejection port substrate; ^ _ 18 the discharge electrode; 20 a guard electrode; 24- counter electrode; 24A-electrode substrate; 24b- insulation sheet; charger. 26A to a high pressure; 26B bias voltage source; the spray 28-

出口; 30—墨水流路;32—绝缘基板;33—驱动电压控制部;34—绝缘层; 35—保护电极控制部;36—开口部;40—墨水诱导堰;60—喷墨记录装置(喷墨打印机);62—送纸辊;64—导向器;66—辊;66a、 66b、 66c—辊;68—输送皮带;69—输送皮带位置检测部件;70—静电吸附部件;70a— 高压带电器;70b—高压电源;72—除电部件;72a—电晕管除电器;72b 一交流电源;72c—直流高压电源;76—定影和输送部件;7S—导向器; 80—头部件;80a—各喷墨头;80b、 80c—墨水供给系统;82—墨水循环系统;82a—墨水循环装置;82b—墨水供给系统;82c—墨水回收系统; 84—头驱动器;86—记录介质位置检测部件;90—排出扇;E。 Outlet; 30- ink flow path; 32- insulating substrate; drive voltage control unit 33; 34- insulating layer; guard electrode control portion 35; 36- opening portion; ink induction weir 40; 60 ink jet recording apparatus ( an ink jet printer); 62- paper feed roller; 64- guide; 66- roll; 66a, 66b, 66c- roller; 68- conveyor belt; 69- conveyor belt position detecting means; electrostatic attraction member 70; 70a hyperbaric charger; 70b- high voltage power supply; 72- neutralization member; 72a- corotron eliminator; 72b an AC power source; 72c- DC high voltage power supply; 76- and conveying a fixing member; 7S- guide; head member 80 ; respective inkjet heads 80A; 80b, 80c- ink supplying system; 82- ink circulation system; 82a- ink circulation means; 82b- ink supply system; 82c- ink recovery system; 84- head driver; 86- position of the recording medium detecting means; 90- discharging fan; E. 、 Ep —电场; , Ep - field;

Fi、 F2—静电力;P—记录介质;Q—墨水;R—墨滴。 Fi, F2- electrostatic force; the P-recording medium; a Q-ink; the R- droplet. 具体实施方式 detailed description

下面,根据附图所示的优选形态详细说明本发明的喷墨头、其控制方法和喷墨记录装置。 Hereinafter, the preferred embodiment illustrated in the drawings according to the ink jet head of the present invention, a control method and an ink jet recording apparatus described in detail.

图1 (A)模式地表示本发明的喷墨头的概略构成的截面,图1 (B) 表示图l (A)的IB-IB线向视图。 FIG 1 (A) schematically represents a cross-sectional schematic view of the ink jet head configuration of the present invention, FIG. 1 (B) represented in FIG. L (A) is a view line IB-IB. 如图l (A)所示,喷墨头10具有头基板12、墨水导向器14、形成了喷出口28的喷出口基板16。 FIG. L (A), the inkjet head 10 includes a head substrate 12, ink guides 14, the substrate 16 is formed a discharge outlet of the discharge port 28. 在喷出口基板16上包围喷出口28那样配置着喷出电极18。 Discharge outlet 16 on the substrate 28 surrounding the discharge outlet 18 arranged as a discharge electrode. 在喷墨头10的与墨水喷出一侧的面(图中,上表面)对面的位置上,配置支撑记录介质P的对置电极24、记录介质P的带电部件26。 In the ink jet head and the ink ejection side surface 10 (FIG., The upper surface) on the opposite position, disposed opposite electrode 24 supports the recording medium P, the recording medium P charged member 26.

另夕卜,头基板12和喷出口基板16在彼此对面的状态下隔开所定间隔配置。 Another Bu Xi, the head substrate 12 and the substrate 16 spaced apart from the discharge port arranged at predetermined intervals in a state opposite to each other. 通过头基板12和喷出口基板16之间形成的空间形成对各喷出口28 供给墨水的墨水流路30。 Each ejection port 28 is formed on the ink flow path 30 for supplying ink through a space formed between the substrate 12 and the ejection port substrate 16.

喷墨头10为了以高速进行更高密度的图像记录,具有二维排列多个喷出口(喷嘴)28的多通道构造。 The inkjet head 10 to perform image recording at a high speed higher density, two-dimensional array having a plurality of ejection ports (nozzles) 28 of the multi-channel configuration. 图2模式地表示在喷墨头IO的喷出口基板16上二维排列多个喷出口的状态。 FIG 2 schematically represents a two-dimensional array of a plurality of ejection ports in the ejection state of the ink jet head substrate 16 exit the IO. 而且,在图1 (A)和图1 (B) 中,为了容易理解喷墨头的构成,只表示多个喷出口中的一个喷出口。 Further, in FIG. 1 (A) and 1 (B) in order to facilitate understanding of the inkjet head configuration, only that a plurality of discharge ports discharge mouth.

在本发明的喷墨头10中,能自由选择喷出口28的个数、或物理上的配置位置。 In the ink jet head 10 according to the present invention, the number freely selectable discharge outlet 28 or a position on the physical configuration. 例如不伩是如图2所示的多通道构造,也可以是只具有l列喷出口。 Xin is not, for example, a multi-channel configuration shown in FIG. 2, may be only a column discharge port l. 另外,可以是具有与记录介质P的全部区域对应的喷出口的列的所谓的(全)行头,或者在与喷嘴列的方向正交的方向扫描的所谓的串行头(往返类型)。 Further, the discharge outlet may be a whole area of ​​the recording medium P corresponding to a so-called column (full) line head, or in a direction perpendicular to the scanning direction of the nozzle row of the so-called serial head (shuttle type). 另外本发明的喷墨头也能与黑白和彩色的任意记录装置对应。 Further the ink jet head of the present invention can also be any corresponding black and white and color recording apparatus. 而且,图2表示多通道构造的一部分(3行3列)的喷出口的排列, Further, FIG. 2 shows an arrangement of a part (three rows and three columns) of the multi-channel configuration of the ejection outlet,

作为优选的形态,在墨水流方向中,下游一侧的列的喷出口28对于上游 As a preferred aspect, in the ink flow direction, the downstream side of the ejection port row 28 upstream

一侧的列的喷出口,在垂直于墨水流的方向隔开所定间隔错开配置。 Ejection outlet side of the column, in a direction perpendicular to the stream of ink predetermined spaced intervals staggered configuration. 通过使下游一侧的列的喷出口对于上游一侧的列的喷出口,在垂直于墨水流的方向错开配置,能对喷出口良好地供给墨水。 By the downstream side with respect to the ejection port rows of the ejection port row upstream side in the direction perpendicular to the stream of ink offset configuration, the ink can be supplied to the discharge outlet well. 在本发明的喷墨头中,下幼, 一侧的列的喷出口对于上游一侧的列的喷出口,在垂直于墨水流的方向错 In the ink jet head of the present invention, the immature, ejection port row for the ejection outlet side to the upstream side of the column, in a direction perpendicular to the dislocation of the ink flow

开配置的n行m列(n, m为正整数)的喷出口在墨水流的方向以一定周期重复,各喷出口对于位于上游一侧的喷出口,在垂直于墨水流的一个方向(在图2中的向上或向下)连续错开配置。 n rows and m columns arranged to open the discharge port (n, m is a positive integer) is repeated at a constant cycle in the ink flow direction, each ejection port for ejection port is positioned upstream side, in a direction perpendicular to the stream of ink (in the upward or downward in FIG. 2) is continuously shifted configuration. 能按照析像度和进给间隔适当设定喷出口的个数、间隔、重复周期。 The discharge port can be appropriately set according to the resolution and the number of feed interval, the interval repetition period.

另外,在图2中,作为优选的形态,在墨水流的方向,下游一侧的列的喷出口对于上游一侧的列的喷出口,在垂直于墨水流的方向错开配置, 但是并不局限于此,下游一侧的喷出口和上游一侧的喷出口在墨水流的方向可以配置在同一直线上。 Further, in FIG. 2, as a preferred aspect, in the flow direction of the ink discharge port row of the ejection port to the downstream side of the upstream side of the column, in a direction perpendicular to the stream of ink offset configuration, but is not limited to thereto, the discharge port and discharge port of the downstream side of the upstream side in the ink flow direction may be disposed on the same straight line. 这时,优选各行的各喷出口对于在垂直于墨水流的方向位于相邻的行的各喷出口,在墨水流的方向错开配置。 In this case, each of the discharge ports in each row for each ejection outlet is preferably in the direction of the ink flow in adjacent vertical lines, arranged offset in the direction of ink flow.

在这样的喷墨头10中,使用把包含颜料等颜色材料,并且具有电荷的微粒(以下称作颜色材料粒子)分散到绝缘性的液体(载液)中形成的墨水Q。 In such an ink jet head 10 using the ink forming an insulating liquid (carrier liquid) contains a color pigment or the like material and having charged particles (hereinafter referred to as a color material particles) dispersed Q. 而且,对设置在喷出口基板16上的喷出电极18施加驱动电压, 使喷出口28产生电场,通过静电力,使喷出口28的墨水喷出。 Further, the ejection driving voltage is applied to the electrodes disposed on the substrate 16 discharge outlet 18, discharge outlet 28 so that an electric field generated by the electrostatic force, so that the discharge port 28 to discharge the ink. 另外通过按照图像数据使施加在喷出电极18上的驱动电压on/off (喷出on/off), 按照图像数据从喷出口28喷出墨滴,在记录介质P上记录图像。 Further in accordance with the image data so that the discharge electrode 18 applied to the drive voltage on / off (discharge on / off), in accordance with image data for ejecting ink droplets from the discharge port 28, an image is recorded on the recording medium P.

下面进一步详细说明图1 (A)和(B)所示的本发明的喷墨头10的构造。 Configuration of FIG. 1 (A) and the inkjet head of the present invention shown in (B) 10 described in further detail below.

如图1 (A)所示,喷墨头10的喷出口基板16,具有绝缘基板32、 保护电极20、喷出电极18、和绝缘层34。 FIG 1 (A), the inkjet head 10 ejection port substrate 16 has an insulating substrate 32, a protective electrode 20, the discharge electrodes 18, 34 and the insulating layer. 在绝缘基板32的图中上方的面(与对着头基板12的一侧相反的面)上按顺序层叠着保护电极20和绝缘层34。 Upper surface (a surface opposite to the side of his head substrate 12) in FIG insulating substrate 32 are stacked in this order on the protective electrode 20 and the insulating layer 34. 另外,在绝缘基板32的图中下方的面(对f头基板12的一侧的面) 上形成着施加用于喷出墨水的驱动电压的喷出电极18。 Further, the bottom surface of the insulating substrate 32 in FIG forming the discharge electrode 18 applying a driving voltage for ejecting the ink (on the side surface of the head substrate 12 f).

另外,在喷出口基板16上贯通绝缘基板32形成着用于喷出墨滴R的喷出口28。 Further, the insulating substrate through the substrate 16 on the discharge port 32 is formed with discharge port 28 for ejecting the ink droplets R. 喷出口28如图1 (B).所示,是长方形的两个短边r侧为半圆形,在墨水流方向细长的茧形开口(狭缝),具有墨水流方向的长度L和 Discharge port 28 in FIG. 1 (B)., The two short sides of the rectangular side semicircular r, in the ink flow direction of the elongated cocoon-shaped opening (slit) having an ink flow direction and the length L

与墨水流正交的方向的长度D的纵横比(L/D)为1以上的形状。 Crossbar ink flow perpendicular to the longitudinal direction D of the aspect ratio of 1 or more (L / D) is.

在本发明中,通过使喷出口28为墨水流方向的长度L和与墨水流正交的方向的长度D的纵横比(L/D)为1以上的开口,墨水容易流到喷出口28。 In the present invention, the discharge outlet 28 by an ink flow direction of the length L D and a length and width in the direction orthogonal to the ink flow ratio (L / D) one or more openings, the ink discharge port 28 flows easily. 即能提高向喷出口28的墨水的粒子供给性,能提高频率响应性, 也能防止堵塞。 I.e., the particles can improve the supply of the ink outlet 28 of the jet, the frequency responsiveness can be improved, it is possible to prevent clogging. 关于这点,在后面将与墨滴的喷出作用一起详细说明。 In this regard, the details will be described later together with the ink droplet ejection action.

另外,在本实施例中,把喷出口28作为茧形开口形成,但是并不局限于此,如果是能从喷出口28喷出墨水的形状,就能以圆形、椭圆形、 矩形、正方形、菱形、平行四边形等任意的形状形成喷出口28。 Further, in the present embodiment, the discharge port 28 is formed as a cocoon-shaped opening, but is not limited to this, if it is discharged from the ink discharge port 28 shape can be circular, oval, rectangular, square, discharge port 28 of an arbitrary shape, a rhombus, a parallelogram, or the like.

作为喷出口28的形状,优选是墨水流方向的长度和垂直于墨水流的方向的长度的纵横比大于l的在墨水流方向细长的形状。 As the shape of the discharge port 28, preferably a vertical and horizontal length and a vertical length direction of the ink flow in the ink flow direction of the elongated shape than the ink flow direction is larger than l. 据此,能提高对喷出口的墨水供给性,能防止堵塞,能稳定地在图像记录介质上形成连续的大点。 This makes it possible to improve the ejection of the ink supply port can be prevented from clogging, can stably form a continuous large dot on the image recording medium. 结果,能以更高频率的描画频率描画高质量的图像。 As a result, high-quality image can be drawn at a higher drawing frequency frequencies. 例如能以墨水流方向为长边的矩形、或墨水流方向为长轴的椭圆形或菱形形成喷出口。 In the ink flow direction can be for example a rectangular shape a long side or major axis of the ink flow direction is formed in an elliptical or diamond-shaped discharge outlet. 另外,可以用墨水流的上游一侧为上底,下游一侧为下底,使墨水流方向的高度比下底长的梯形形成喷出口。 Further, the substrate may be a stream of ink upstream side, a downstream side of the lower base, the height of the ink flow direction of the discharge port is formed longer than the lower base of the trapezoid. 这时,可以是上游一侧的边长, 也可以是下游一侧的边长。 In this case, the upstream side of the side length, or may be a side downstream side. 另外,可以是在墨水流方向为长边的长方形的双方的短边一侧,连接直径比该长方形的短边还大的圆的形状。 Further, the shape may be rounded in the ink flow direction both short sides of the rectangular long side, larger than the diameter of the connection of the shorter sides of the rectangle. 如此通过使喷出口28为在墨水流方向细长的形状,能提高对喷出口28的墨水供给性,并且能防止堵塞。 Thus by making the discharge port 28 to the ink flow direction in the elongated shape, the ink supply can improve the resistance of the discharge port 28, and clogging can be prevented. 另外,喷出口28对于其中心可以是在上游一侧和下游一侧对称的形状,也可以是非对称的形状。 Further, the discharge port 28 to the center thereof may be on the upstream side and a downstream side of the symmetrical shape, the shape may be asymmetrical.

下面说明在图1 (A)所示的喷墨头10的喷出口基板16上形成的喷出电极。 Below the discharge electrode is formed on the ink jet head shown in (A) of the discharge port 10 of the substrate 16 in FIG. 1 explained. 在绝缘基板32的下表面(与头基板12相对向的面)上形成着图1 (B)所示的喷出电极18。 The lower surface (surface facing the head substrate 12) of the insulating substrate 32 is formed with discharge electrodes 18 shown in (B) of FIG. 1 on. 沿着喷出口28的周缘配置着喷出电极18,从而包围喷出口28的周围。 The discharge outlet 28 along the peripheral edge of the discharge electrode 18 disposed to surround the periphery of the discharge port 28. 在图1 (B)中,以与喷出口28的相似形的形状形成喷出电极18,但是并不局限于此,如果是包围喷出口28周围的形状,就能变更为各种形状。 In FIG 1 (B), a shape similar to the shape of the discharge port 28 of the discharge electrode 18 is formed, but is not limited to this, if it is a shape surrounding the periphery of the discharge port 28, it can be changed in various shapes. 例如,能以圆形、近圆形、椭圆形、近椭圆形的形状形成喷出电极。 For example, the discharge electrode can be formed in a circular, nearly circular, oval, nearly oval shape. 另外,能按照喷出口28的形状,变更为各种形状。 Further, the shape of the discharge port 28 can follow the changes in various shapes. 可以不完全包围喷出口28周围,例如可以是墨水流方向的上游一侧或下游一侧的喷出电极的一部分切去的C^型、3字型等的形状。 May not completely surround around the discharge port 28, the discharge electrode may be part of the upstream side or downstream side of the ink flow direction is cut C ^, shapes like 3 font. 另外,可以为与墨水流方向平行夹着喷出口配置的平行电极或近平行电极。 Further, a direction parallel to the ink flow parallel to sandwich the ejection outlet or near an electrode arranged parallel electrodes.

如上所述,喷墨头10具有把喷出口28 二维排列的多通道构造,所 As described above, the ink jet head 10 has a discharge outlet 28 arranged in a two-dimensional multi-channel structure, the

以如图2所示,与各喷出口28对应,二维配置着喷出电极18。 In FIG. 2, and corresponding to each ejection port 28, the discharge electrode 18 disposed two-dimensionally.

另外,喷出电极18在墨水流路30露出,与流过墨水流路30的墨水Q 接触。 Further, the discharge electrode 18 is exposed in an ink flow path 30, and flows through the ink flow path 30 is in contact with the ink Q. 图1 (A)所示的喷墨头通过采用这样的构造,能大幅度提高墨滴的喷出性。 FIG 1 (A) by using the ink jet head shown in this configuration, can greatly improve the ejection of ink droplets. 关于这点,在后面将与墨滴的喷出作用一起详细说明。 In this regard, the details will be described later together with the ink droplet ejection action. 可是, 喷出电极18没必要在墨水流路30中露出而与墨水接触,喷出电极1S可以形成在喷出口基板16的内部,也可以用绝缘层覆盖图(l)所示的喷出电极18的墨水流路中露出的面。 However, the discharge electrode 18 need not be exposed to contact with the ink in the ink flow path 30, the discharge electrode 1S discharge port may be formed within the substrate 16 may be covered with an insulating layer in FIG. (L) of the discharge electrode shown in ink flow path 18 in the exposed surface.

另外,喷出电极18如图1 (A)所示,连接在驱动电压控制部33上。 Further, the discharge electrode 18 in FIG. 1 (A), the driving voltage is connected to the control unit 33. 驱动电压控制部33,按照描画信号控制在墨水喷出时和不喷出墨水吋施加在喷出电极上的驱动电压。 Driving voltage control unit 33. The control signal is drawn and ink is ejected when the ink is not discharged inch drive voltage applied on the discharge electrode.

下面说明图1 (A)所示的喷墨头10的保护电极20。 Protective electrode will be described ink jet head shown in FIG. 1 (A) 10 to 20. 如图1 〔A)所示,保护电极20形成在绝缘基板32的表面上,保护电极20的表面由绝缘层34覆盖着。 [FIG. 1 A), the protective electrode 20 is formed on the surface of the insulating substrate 32, the electrode 20 by the surface of the protective insulating layer 34 covers. 图3模式地表示保护电极20的平面构造。 FIG 3 schematically shows the plane configuration of the protective electrode 20. 图3是图](A) 的Ill-Ill线向视图,模式地表示多构造的喷墨头10的保护电极20的平面构造。 FIG 3 is a diagram] (A) is a plan line Ill-Ill protective electrode structure 10 of the ink jet head 20 to the configuration of the multi-view, schematically. 如图3所示,保护电极20是金属板等对各喷出电极公共的薄版状电极,在与二维排列的各喷出口28的周围形成的喷出电极18对应的位置具有开口部36。 3, the protective electrode 20 is a thin metal plate or the like common to each ejection electrode plate electrode, a position corresponding to the ejection electrode 18 formed around each of the two-dimensional arrangement of the ejection outlet 28 has an opening 36 . 保护电极20的开口部36与喷出口28的形状同样形成为矩形。 An opening portion 20 of the guard electrode 36 and discharge outlet 28 is also formed in a rectangular shape. 保护电极20的开口部36的长度和宽度比喷出口28的长度和宽度大。 Length and width of the opening portion 36 of the guard electrode 20 is larger than the length and width of the discharge port 28.

保护电极20能遮蔽相邻的喷出电极18之间的电力线,抑制电场干涉。 A power line between the discharge electrodes 18 can shield adjacent to the guard electrode 20 to suppress electric field interference. 保护电极20与保护电极控制部35连接着,通过保护电极控制部35施加与扫描信号的频率同步的所定的交流偏压。 20 and the guard electrode control portion connected to the protective electrode 35, a scanning signal is applied to the frequency synchronized AC biased by a predetermined guard electrode control portion 35. 而且,通过在喷墨头的记录动作时在保护电极20上施加这样的交流偏压,控制墨水的浓縮性和喷出性。 Further, when the recording operation by the ink jet head guard electrode in applying such AC bias 20, the control and discharge of concentrated ink. 后面说明施加在保护电极20上的交流偏压的控制方法。 The control method described later is applied on the protective electrode 20 is an alternating current bias.

. 保护电极20作为优选的形态,如图l (A)所示,形成在与喷出电极18不同的层上,由绝缘层34覆盖其表面。 It forms the protective electrode 20 as is preferred, as shown in FIG l (A) as shown, is formed on a different layer of the discharging electrode 18, an insulating layer 34 covers the surface thereof. 通过由绝缘层34覆盖保护电极20的表面,能防止从喷出口泄漏的墨水与保护电极接触。 Through the insulating layer 34 covers the surface of the protective electrode 20, guard electrode can be prevented from contacting with the ink discharge port from leakage.

通过具有这样的绝缘层34,能恰当地防止相邻的喷出电极18之间的电场干涉,并且能防止在喷出电极18和保护电极20之间,墨水Q的颜色 By having such an insulating layer 34, can appropriately prevent the electric field between the discharge electrodes 18 adjacent interference, and can prevent discharge between the electrode 18 and guard electrode 20, the color of the ink Q

材料粒子成膜,放电。 Forming material particles discharge.

这里,保护电极20设置成:确保从喷出电极18产生的电力线中作用于对应的喷出口28 (以下"本通道")的电力线,遮蔽其他喷出口28 (同样为"其他通道")上设置的喷出电极18的电力线和对其他通道的电力线。 Here, the guard electrode 20 is provided to: ensure that action from the power line discharge generated by the electrode 18 to the corresponding ejection port 28 (hereinafter, "this channel") power line, shielding the other discharge port 28 is provided (the same as "other channels") on the discharge electrode 18 of the power line and the power line of the other channels.

当没有保护电极20时,在墨滴的喷出时,从喷出电极18的喷出口一侧的端部(以下称作喷出电极的内缘部)产生的电力线收敛在喷出电极18 的内侧,即由喷出电极18的内缘部包围的区域内,作用在本通道上,产生墨滴的喷出所必要的电场。 When no protective electrode 20, when the ink droplets ejected from the ejection outlet side end portion of the ejection electrode 18 (hereinafter, referred to as an inner edge portion of the discharge electrode) generated a power line discharge electrode 18 converges the inner side, i.e., a region surrounded by the inner edge portion of the ejection electrode 18, act on this channel, ejecting ink droplets generated electric field necessary. 而从喷出电极18的与喷出口一侧相反一侧的端部(以下称作喷出电极的外缘部)产生的电力线比喷出电极18的外缘部更向外侧发散,对其他通道带来影响,产生电场干涉。 From the ejection outlet side end portion of the side opposite to the discharge electrode 18 (hereinafter, referred to as an outer edge portion of the discharge electrode) to produce more power lines diverging outwardly than an outer edge portion 18 of the discharge electrode, to other channels impact, an electric field interference.

如果考虑以上的点,保护电极20的开口部36的宽度和长度优选为不遮蔽对本通道的电力线,在基板平面观察时,比本通道的喷出电极1S的宽度和长度还大。 Considering the above point, the guard electrode width and length of the opening portion 20 is preferably 36 does not shield the power line of the channel, viewed in the plane of the substrate, and a length larger than the width of the discharge electrode 1S this channel. 即保护电极20的喷出口28侧的端部与本通道的喷出电极18的内缘部相比,更从喷出口28远离(后退)。 Compared to an inner edge portion of the ejection electrode 28 that is a protective electrode ejection outlet side end portion of this passageway 20 18, more away from the discharge port 28 (backward).

另外,为了高效遮蔽对其他通道的电力线,保护电极20的开口部36 的长度和宽度在基板平面观察时,比本通道的喷出电极18的外缘部间的间隔(外径)小。 Further, in order to efficiently shield the power line to the other channels, the length and width of the protective electrode 36 is an opening portion 20 of the substrate viewed in plan, smaller than the interval (outer diameter) between the outer edge portion of the ejection electrode 18 of the present channel. 即保护电极20的内缘部比本通道的喷出电极1S的外缘部更接近喷出口28。 I.e., an inner edge portion of the protective electrode 20 is more than the outer edge portion of the discharge electrode of the present 1S passage 28 near the discharge port. 根据本发明的研究,该接近量为5y m,特别优选为10y m以上。 According to the present invention, the amount is close 5y m, particularly preferably 10y m.

通过具有所述构成,能充分确保来自喷出口28的喷出稳定性,恰当地抑制相邻的通道间的电场干涉引起的墨水落下位置的偏差,能稳定地进行高质量的图像记录。 By having the configuration, can be sufficiently secured ejection stability from a discharge port 28, to appropriately suppress the electric field between the adjacent ink channels due to interference variations falling position, can stably record a high quality image.

也可以将保护电极20设置成:使保护电极20的开口部36为与由喷出电极18的内缘部或外缘部形成的形状相似的形状,保护电极20的内缘部比本通道的喷出电极18的内缘部更从喷出口28远离(后退),比喷出电极的外缘部更接近(前进)喷出口28 (即形成保护电极20的开口部36)。 Guard electrode 20 may be provided: the opening portion 36 of the guard electrode 20 is formed by the shape of the inner edge portion or the outer edge portion of the ejection electrode 18 is similar to the shape of the inner edge portion of the protective electrode 20 over this channel an inner edge portion of the ejection electrode 18 is more remote from the discharge port 28 (backward), an outer edge portion closer to the discharge electrode (forward) discharge port 28 (i.e., opening 36 formed in the protective electrode 20).

另外,在以上的例子中,保护电极20为各喷出电极18中公共的薄板状电极,但是本发明并不局限于此,如果设置为在各喷出口间能屏蔽其他通道的电力线,就可以是任意的形状或构造。 Further, in the above example, the guard electrode in each ejection electrode 20 is a thin plate 18 in the common electrode, but the present invention is not limited to this, if set between the respective power lines can shield the discharge port of the other channel, can be any shape or configuration. 例如保护电极在各喷出口之间可以设置为网眼状。 For example, the guard electrode in each ejection port can be provided between the mesh shape. 另外在排列为矩阵形状的多个喷出口中,当在行方向和列方向相邻的喷出口的间隔不同时,可以在不产生电场干涉程度充分远离的喷出口之间不设置保护电极,只在接近的喷出口之间设置保护电极。 Also in the spacer arranged in a matrix shape, a plurality of ejection port, when the row and column directions adjacent to the discharge port is not the same, the degree of electric field may be generated interference is not sufficiently away from the discharge outlet provided between the protective electrode not only between the discharge outlet is provided close to the guard electrode. 另外,保护电极可以不是配置为矩阵形状的各喷出电极中公共的构造, 可以是矩阵形状的喷出电极的各列或各行或各交错排列中公共的构造。 Further, the protective electrode may be not arranged in a matrix shape, each of the discharge electrodes in a common structure, may be discharged in each row or each column of the matrix shape or electrodes each staggered configuration in common. 这时,可以与各列或各行或各交错排列中公共设置的各保护电极对应,个别设置保护电极控制部,在一个保护电极控制部上连接各保护电极,个别或公共控制各保护电极。 In this case, the connection of each electrode on a protective guard electrode control portion of each column or each row or staggered in the individual protective electrode control unit corresponding to the respective protective electrode, a common set of each individual or common control electrode protection. 这里,用语"公共"不仅意味着构造的公共,是也包含电公共的概念。 Here, the term "public" means not only the structure of the public, it is also included in the concept of public power. 因此,保护电极即使彼此在构造上具有独立的构造, 如果电连接,变为公共,就满足所述的公共。 Thus, even if the guard electrode structure independent from each other in construction, if the electrical connections, become public, the public satisfied.

所述任意形状的保护电极时也如图1 (A)所示,可以形成保护电极 The guard electrode also FIG arbitrary shape 1 (A), the protective electrode may be formed

20,从而对于本通道的喷出电极18,保护电极20的内缘部比喷出电极化的内缘部更远离喷出口28,比喷出电极18的外缘部更接近喷出口28。 20, so that for the discharge electrodes 18 of this channel, an inner edge portion of the protective electrode 20 than the inner edge portion of the discharge electrode of the further away from the discharge port 28, the discharge electrode 18 than the outer edge portion closer to the ejection outlet 28.

这里,保护电极20的开口部36的形状为与喷出口28的形状大致同样的形状,但是并不局限于此,如果能遮蔽相邻的喷出电极18之间的电力线,防止电场干涉,就可以为任意的形状。 Here, protection of the opening portion 20 of the electrode 36 is shaped substantially the same shape as the shape of the discharge port 28, but is not limited to this, if the shielding power lines between the adjacent ejection electrodes 18, to prevent electric field interference, it It can be any shape. 例如能以圆形或椭圆形、正方形、菱形等形状形成保护电极20的开口部36。 An opening portion 36 can be formed, for example, a guard electrode 20 in a circular or elliptical, square, diamond shape.

下面,说明图1 (A)所示的喷墨头10的墨水导向器14。 Next, FIG. 1 (A) of the ink jet head 10 of the guide 14 shown. 墨水导向器14由具有所定厚度的陶瓷制平板构成,与各喷出口28 (喷出部)对应, 配置在头基板12上。 An ink guide 14 is made of a ceramic plate having a predetermined thickness, and each ejection port 28 (ejection portion) corresponding to arranged on the head substrate 12. 墨水导向器14按照喷出口28的长边的长度方向, 形成为宽度稍宽。 An ink ejection outlet guide 14 according to the length of the longitudinal direction 28, and is formed slightly wider. 如上所述,墨水导向器14通过喷出口28,其顶端部分14a比喷出口基板16的记录介质P—侧的表面(绝缘层34的表面)更向上方突出。 As described above, the ink guide 14 through the discharge port 28, the tip end portion 14a of the side surface of the recording medium 16 P- (surface of the insulating layer 34) than the ejection port substrate protrudes upwardly.

墨水导向器14的顶端部分14a成形为与墨水流方向平行的截面形状随着朝向对置电极24—侦L逐渐变细的近三角形(或梯形)。 The tip portion 14a of the ink guide 14 is formed parallel to the cross-sectional shape of the ink flow direction toward the counter electrode 24- L investigation tapered substantially triangular (or trapezoidal). 墨水导向器14配置为顶端部分14a的倾斜面与墨水流方向交叉。 Ink 14 is configured to guide tip portion 14a of the inclined surface intersecting the ink flow direction. 据此,流入喷出口28的墨水沿着墨水导向器14的顶端部分14a的倾斜面到达顶端部分14a 的顶点,所以在喷出口28稳定地形成墨水的弯液面。 Accordingly, ink flowing into the discharge port 28 reaches the top of the vertex portion 14a along the ink guide tip portion 14a of the inclined surface 14, 28 so that the ink meniscus is formed stably in the discharge port.

另外,通过在喷出口28的长度方向上宽地形成墨水导向器14,能缩短与墨水流正交的方向的宽度,能减少^f墨水流带来的影响,并且能稳定地形成后面叙述的弯液面。 Further, by forming the ink guide width in the longitudinal direction 14 of the discharge outlet 28 can be shortened width direction orthogonal to the ink flow, can reduce the influence caused by the ink flow ^ f, and can be stably formed later described meniscus.

而且,墨水导向器14的形状如果能把墨水Q内的颜色材料通过喷出 Further, the shape of the ink guide 14 can, if the color material in the ink Q through the ejection

口基板16的喷出口28,浓縮到顶端部分14a,就未特别限制,例如顶端部分14a可以不是随着朝向对置电极24而变细的形状,能适当变更。 Opening discharge outlet 28 of the substrate 16 is concentrated to the tip portion 14a, it is not particularly limited, the tip portion 14a may not be 24 toward the tapered shape of the counter electrode can be appropriately changed. 例如在墨水导向器14的中央部分可以形成在图中上下方向通过毛细管现象把墨水Q收集到顶端部分14a中的成为墨水导向器沟的切口。 For example, in the central portion of the ink guide 14 may be formed in the ink guide groove notch in the vertical direction by the capillary action of the ink Q to the tip portion 14a is collected in the figure. 另外,在图1 (B)中,按照喷出口的形状,为在墨水流方向长的板状的形状,但是并不局限于此,可以是棱柱。 Further, in FIG. 1 (B), according to the shape of the discharge port, ink flow is in the direction of the long plate-like shape, but is not limited to this, and may be a prism.

另外,墨水导向器14优选在其最顶端部蒸镀金属,通过在墨水导向器14的最顶端部蒸镀金属,墨水导向器14的顶端部分14a的介电常数实质上增大。 Further, the ink guide 14 at its top portion is preferably a metal vapor, the metal vapor through the top portion of the ink guide 14, the dielectric constant of the tip portion 14a of the ink guide 14 is substantially increased. 据此,当在喷出电极上施加驱动电压时,容易在墨水导向器14 中产生强电场,能提高墨水的喷出性。 Accordingly, when the drive voltage is applied on the discharge electrode, a strong electric field easily generated in the ink guides 14, the discharge of the ink can be improved.

本实施例的喷墨头10如图1 (A)所示,作为优选的形状,在头基板12中设置向喷出口诱导墨水的墨水诱导堰40。 The ink jet head 10 of the present embodiment shown in FIG 1 (A), as a preferred shape, provided induce ink to the ink ejection outlet weir 40 induced in the head substrate 12. 以下参照图4 (A)和(B) 详细说明该墨水诱导堰40。 Detailed Description The ink inducing weir 40 with reference to FIG. 4 (A) and (B).

图4 (A)是表示图1中的喷出部附近的'构成部分截面立体图。 FIG. 4 (A) shows the vicinity of the discharge portion in FIG. 1 'constitutes a perspective cross-sectional view of a portion. 在图4 (A)中,为了明确表示墨水诱导堰40的构造,在墨水导向器14的大致中央的位置沿着墨水流方向切断而表示喷出口基板16。 In FIG. 4 (A), to clear the weir structure 40 of the ink induction, cut along the ink flow direction at the substantially central position of the ink guide 14 and the ejection port substrate 16 represents.

墨水诱导堰40是头基板12的墨水流路30 —侧的面,即墨水流路30 的底面,设置在墨水导向器14的墨水流方向(箭头方向)的上游一侧和下游一侧。 Weir 40 is induced by the ink flow path 30 of the ink of the head substrate 12 - side surface, a bottom surface 30 Jimo water passage is provided on the upstream side and a downstream side ink flow direction (arrow direction) of the ink guides 14. 墨水诱导堰40具有对于墨水流方向,从与喷出口28对应的位置的附近向着与喷出口28的中心对应的位置,逐渐接近喷出口基板L6而倾斜的面。 Weir 40 for inducing ink having an ink flow direction, from the vicinity of a position corresponding to the discharge port 28 toward the discharge position of the center of the corresponding outlet 28, gradually approaches the surface of the substrate L6 and the discharge port is inclined. 即墨水诱导堰40具有沿着墨水流方向,向着喷出口28倾斜的形状。 I.e., the ink 40 having a weir induced along the ink flow direction toward the ejection outlet 28 is inclined shape.

另外,墨水诱导堰40在与墨水流方向正交的方向,具有与喷出口28 大致相同的宽度,成为具有从底面垂直设置的壁面的形状。 Further, the ink inducing weir 40 in a direction orthogonal to the ink flow direction, with the discharge port 28 having substantially the same width, a shape having a wall surface vertically arranged from the bottom surface. 另外,墨水诱导堰40为了不堵塞喷出口28,确保墨水Q的流路,从喷出口基板16的墨水流路30—侧的面,即墨水流路30的上表面隔开所定的间隔设置。 Further, the ink dam 40 in order not to induce clogging of discharge outlet 28, ensure that the ink flow path Q, from the surface side of the discharge outlet 30- ink flow path substrate 16, the upper surface 30 of the water flow path Jimo predetermined spaced intervals. 这样的墨水诱导堰40分别设置在各喷出部中。 Such ink inducing weir 40 are provided in each of the discharge portion.

这样,通过在墨水流路30的底面,设置沿着墨水流方向,向喷出口28倾斜的墨水诱导堰40,形成朝向喷出口28的墨水流,把墨水Q诱导到喷出口28的墨水流路30—侧的开口部。 Thus, the bottom surface of the ink flow path 30 is provided along the ink flow direction, is inclined to the discharge port 28 of the ink inducing weir 40 is formed toward the discharge port 28 of the ink flow, the ink Q induced to discharge outlet 28 of the ink flow passage 30 - opening side. 因此,能恰当地把墨水Q向喷出口2S内部适宜地流入,能进一步提高墨水的粒子供给性。 Thus, the ink can be properly 2S Q to the discharge port flows into the interior Suitably, the particles can be further improved supply of the ink. 进而能可靠地防止喷出口的堵塞。 Further possible to reliably prevent clogging of the discharge outlet.

在与相邻的喷出口不干涉的范围中,适当设定墨水诱导堰40的墨水流方向的长度,从而能恰当地把墨水Q诱导到喷出口28,但是如图4(B) 所示,优选对于墨水诱导堰40的最高部的高度h,为3倍以上(l/h^3), 更优选为8倍以上(l/h^8)。 In the non-interference with the adjacent discharge port range, ink is appropriately set ink flow induced longitudinal direction of the weir 40, so that the ink Q can be suitably induced to the discharge port 28, but shown in FIG. 4 (B), preferably the height h of the dam for the ink induction portion 40 is the highest, 3 times or more (l / h ^ 3), and more preferably not less than 8 times (l / h ^ 8).

墨水诱导堰40的与墨水流正交的方向的宽度与喷出口2S为同等,或宽一些。 Ink induced weir 40 with the discharge outlet to the width direction orthogonal to the ink flow is equivalent 2S, or some width. 另外,墨水诱导堰40的宽度并不限定于图示例那样均等的宽度, 宽度可以逐渐减少或逐渐增加。 Further, the width of the ink inducing weir 40 is not limited to the illustrated example as a uniform width, the width may be gradually reduced or gradually increased. 另外,其壁面并不局限于垂直面,也可以是斜面。 In addition, it is not limited to the vertical wall, it may be beveled.

墨水诱导堰40的斜面(墨水诱导面)可以是适合于把墨水Q向喷出口28诱导的形状,可以是具有一定倾斜角的斜面,可以是倾斜角变化的面,可以是弯曲面。 Ink induced weir 40 inclined surface (ink guide plane) may be adapted to the ink Q to the ejection outlet induced shape 28, may have a slope of a certain inclination angle, the inclination angle may be changed surfaces may be curved surfaces. 另外,该表面并不局限于平滑面,在墨水流方向,或向着喷出口28的中心部,把1条以上的垄或沟形成放射状。 Further, the surface is not limited to a smooth surface, in the ink flow direction, or toward the ejection outlet 28 of the central portion, the at least one ridge or groove is formed radially.

另夕卜,墨水诱导堰40上部的与墨水导向器14的连接部附近可以不像图示例那样具有阶差,可以为平滑连接的形状。 Another Bu Xi, the upper portion 40 of the ink induction part connected to the vicinity of the weir of the ink guide 14 may not have a level difference as an example in FIG., May be smoothly connected shape.

在图示例中,为墨水诱导堰40配置在墨水导向器14的上游一恻和下游一侧的形态,但是可以在喷出口28的上游一侧和下游一侧设置具有斜面的梯形的墨水诱导堰40,在其上部直立设置墨水导向器14的形态,也可以是一体形成墨水导向器14和墨水诱导堰40。 In the illustrated example, an ink induction weir 40 is disposed upstream of a sad shape and a downstream side of the ink guide 14, but the ink may have induced slope trapezoidal weir on the upstream side and a downstream side of the discharge outlet 28 is provided 40, in its upper part erected form an ink guide 14, 14 may be integrally formed and an ink induction weir 40 guide the ink. 墨水诱导堰40可以与墨水导向器14分别或一体形成,可以安装在头基板12上,或通过以往公开的挖掘装置削去头基板12而形成。 Ink can be induced weir 40 or 14 are integrally formed with the ink guide, it may be mounted on the head substrate 12, or 12 formed by the conventional apparatus disclosed in excavating head substrate cut away.

而且,墨水诱导堰40可以设置在喷出口28的上游一侧,但是优选如图示例那样,在喷出口28的下游一侧也设置墨水诱导堰40,使墨滴R的喷出方向的高度伴随着远离喷出口28而变低。 Moreover, the ink inducing weir 40 may be disposed on the upstream side of the discharge port 28, but preferably as shown in the example, on the downstream side of the discharge port 28 is also provided an ink induction weir 40, the height of the ink droplet discharge direction accompanying R away from the discharge port 28 becomes low. 据此,由上游一侧的墨水诱导堰40朝向喷出口28诱导的墨水Q平滑地流向下游一侧,所以墨水Q 不会变为乱流,能保证墨水流的稳定,能保证喷出的稳定性。 Accordingly, the ink from the upstream side of the weir 40 toward induction induced discharge outlet 28 of the ink smoothly flows downstream side of Q, the ink Q thus does not become turbulent flow to ensure a stable stream of ink, to ensure stable ejection of sex.

在图4所示的例子中,墨水诱导堰40配置在头基板12的上表面,但是并不局限于此,例如可以在头基板12上形成墨水流沟,在该墨水流沟的内部设置图4所示的构造的墨水诱导堰。 In the example shown in FIG. 4, the ink inducing weir 40 is disposed on the surface of the head substrate 12, but is not limited to this, the ink flow groove may be formed on the head substrate 12, FIG disposed inside the ink flow groove configuration shown in FIG. 4 of the ink inducing weir.

例如在图l (A)中,在头基板12的上表面沿着墨水流方向形成通过与喷出口28对应的位置的所定沟深度的墨水流沟。 For example, in FIG. L (A) formed by the position of the discharge port 28 corresponding to the groove in which the groove depth of the ink flow along the ink flow direction on the surface of the head substrate 12. 而且,在墨水流沟的与喷出口28对应的位置上设置具有沿着墨水流方向,朝向喷出口28倾斜的面的墨水诱导堰。 Further, an ink set having an ink flow along a direction toward the ejection outlet surface 28 is inclined at the position of the weir 28 corresponding to induce ink flow groove with the ejection outlet. 通过这样的头基板上形成墨水流沟,能有选择地使流过墨水流路30的墨水的大部分流向墨水流沟。 Ink flow groove formed by such a head substrate, can be selectively flowing through most of the ink flows to the ink flow groove 30 of the ink flow path. 另外,通过在该墨水流沟中形成图4所示的墨水诱导堰40,能恰当地使流过墨水流沟的墨水流入喷出口28的内部,能提高对墨水导向器14的顶端部分14a的墨水的供给性。 Further, by forming the ink flow grooves FIG ink inducing weir 40 in FIG. 4, the ink can be properly flow through the ink flow groove 28 flows into the interior of the discharge port, the ink can be improved to the top of the guide portion 14a 14 supply of ink.

下面说明与喷墨头io的墨滴R的喷出面对面而配置的对置电极24。 DESCRIPTION face to face with the ink jet head discharging ink droplets R io is arranged counter electrode 24. 对置电极24如图1 (A)所示,配置在与墨水导向器14的顶端部分14a 相对向的位置,由接地的电极基板24a、配置在电极基板24a的图中下方的表面即喷墨头10 —侧的表面上的绝缘薄板24b构成。 The counter electrode 24 in FIG. 1 (A) as shown, arranged at a position opposed to the ink guide tip portion 14a 14 of the ground electrode substrate 24a is disposed beneath the surface of the electrode substrate 24a in FIG ink jet head 10 - on the surface of the insulation sheet 24b constituting the side.

在该对置电极24的图中下方的表面即绝缘薄板24b的表面通过静电吸附保持记录介质P。 In view of the opposing electrode 24 in the lower surface of the insulation sheet 24b, i.e. the holding surface of the recording medium by electrostatic adsorption P. 对置电极24 (绝缘薄板24b)作为记录介质P的压盘起作用。 The counter electrode 24 (the insulating sheet 24b) functions as a platen of the recording medium P.

对置电极24的绝缘薄板24b上保持的记录介质P,至少在记录吋通过带电部件26,带上与施加在喷出电极18上的驱动电压相反极性的所定的负的高电压。 The recording medium P held on the insulating sheet 24b of the counter electrode 24, recording at least 26 inches by the charging member, to bring the driving voltage applied to the discharge electrode 18 of polarity opposite to a predetermined negative high voltage. 结果记录介质P带负电,偏置为负的高电压,作为对于喷出电极18的实质上的对置电极起作用,并且静电吸附在对置电极24的绝缘薄板24b上。 Results recording medium P is negatively charged, a negative bias high voltage, substantially as a counter electrode to the discharge electrode 18 acts, and electrostatically attracted to the counter electrode on the insulating sheet 24 24b.

带电部件26具有用于使记录介质P带负的高电压的高压带电器26a、 对高压带电器26a供给负的高电压的偏电压源26b。 A charging member 26 having the recording medium P having the negative high-voltage high-voltage charger 26a, 26a of the negative high voltage is supplied to the high-voltage charging bias voltage source 26b. 而且,作为本发明中使用的带电部件26的带电部件,并不局限于高压带电器26a,能使用电晕管带电器、固体充电器、放电针等各种放电部件。 Further, the charging member used in the present invention, the charging member 26 is not limited to the high-pressure charger 26a, can be used corotron charger, a solid charger, the discharge needles and other discharge members.

另外,在图示例中,由电极基板24a和绝缘薄板24b构成对置电极24, 通过带电部件26使记录介质P带负的高电压,施加偏压,作为对置电极起作用,并且把记录介质P静电&附在绝缘薄板24b的表面,但是本发明并不局限于此,可以只由电极基板24a构成对置电极24,把对置电极24 (电极基板24a自身)连接在负的高电压的偏电压源上,总偏置为负的高电压,把记录介质P静电吸附在对置电极24的表面上。 Further, in the illustrated example, the electrode substrate 24a and the insulating sheet 24b constituting the counter electrode 24, the recording medium P by the charging member 26 with a high voltage negative bias voltage is applied, functions as an opposite electrode, and the recording medium P & electrostatically attached to the surface of the insulation sheet 24b, but the present invention is not limited thereto, may be constituted only by the electrode substrate 24a of the counter electrode 24, the counter electrode 24 (electrode substrate 24a itself) connected to the negative high voltage a bias voltage source, the total offset negative high voltage, the recording medium P electrostatically attracted to the surface of the counter electrode 24. ' '

另外,可以通过各负的高电压源进行通过负的高电压源进行记录介质 Further, the recording can be performed by the negative high voltage source medium through the negative high voltage source

P向对置电极24的静电吸附、使记录介质P带负的高电压或向对置电极24施加负的偏置高电压,基于对置电极24的记录介质P的保持并不周限于记录介质P的静电吸附,可以使用其它保持方法或保持部件。 P electrostatically attracted to the counter electrode 24 of the recording medium P with negative high voltage or high voltage bias is applied to the negative counter electrode 24, based on the recording medium P holding the counter electrode 24 is not limited to the periphery of the recording medium P is electrostatically adsorbed, other holding member or holding method.

以上详细说明了本发明的喷墨头10的构造。 Described in detail above is the configuration of the present invention, the ink jet head 10. 下面,参照图1和图5 说明具有这样的构造的喷墨头10的墨水喷出的动作。 Referring to FIG. 5 illustrates the ink jet head 10 having such a configuration and a discharging operation of FIG. 而且,以颜色材料粒子的极性为正电荷时为例进行说明,但是当颜色材料粒子的极性相反时,即负电荷时,电压值变为相反极性。 Further, in order to color a polar material particles will be described as an example when a positive charge, but opposite polarity when the color material particles, i.e. negative charges, voltage polarity is reversed.

图5表示图像数据或印字数据等描画信号(喷出数据信号)的波形、 施加在喷出电极上的驱动电压波形(脉冲波形)、施加在保护电极上的交流偏压的电压波形A1〜D1。 Waveform (ejection data signal) in FIG. 5 shows a print image data or drawing data signal, applies a drive voltage waveform (pulse waveform) on a discharge electrode, a voltage waveform of the AC bias is applied to the protective electrode A1~D1 . 图5的上部所示的描画信号在墨水的喷出和非喷出的指示中利用,根据该描画信号控制墨水的喷出。 Signal shown in the upper drawing in FIG. 5 and the non-ejection of ink discharged indicates utilized, in accordance with the ink ejection control signal of the drawing. 施加在喷出电极上的驱动电压(脉冲电压)的周期和脉冲宽度如图5所示,与描画信号的周期以及脉冲宽度相同。 Applied to the discharge electrode of the driving voltage (pulse voltage) of the period and pulse width as shown in Figure 5, the same period and pulse width of the signal drawn. 另外,喷出电极18上施加的驱动电压Vp例如设定为600[V]。 Further, the driving voltage Vp is applied to the discharge electrode 18 is set to, for example, 600 [V]. 当对喷出电极18上不施加驱动电压时,把喷出电极18例如设定为O[V]。 When the ejection driving voltage is not applied to the electrode 18, the discharge electrodes 18 is set to, for example, O [V]. 驱动电压的电压值并不局限于所述值,当在喷出电极18上施加驱动电压时,如果能可靠地喷出墨水,就能设定为任意的电压值。 Drive voltage value is not limited to the voltage value, when a driving voltage is applied on the discharge electrode 18, if the ink can be reliably ejected, can be set to an arbitrary voltage value.

图1 (A)所示的喷墨头的记录动作时,在喷出电极18上以图5的驱动电压波形所示的定时施加驱动电压。 FIG 1 (A) during operation of the ink jet recording head shown in the ejection driving voltage is applied to the electrode 18 shown in FIG. 5 is a timing driving voltage waveform. 即与描画信号同步,施加用于喷出墨水的驱动电压。 I.e., synchronization with the drawing signal, the driving voltage is applied for ejecting ink. 指示墨水的喷出的描画信号(图中,用on表示的信号) 如果提供给喷出电极18上连接的驱动电压控制部33,就以与该描画信号相同的定时对喷出电极18施加驱动电压。 Discharged drawing signal (the drawing, the signal represented on) if the indicator ink drive voltage control unit connected to the upper electrode 18 is supplied to the discharge 33, it is drawn with the same timing of applying a drive signal to the ejection electrodes 18 Voltage. 据此,从喷出电极18产生作用于墨水的喷出的电场,从喷出口28喷出墨水。 Accordingly, an effect from the discharge electrode 18 in the field of ink ejected, ink is ejected from the discharge outlet 28.

另一方面,当指示墨水的非喷出的描画信号(图中,用off表示的信号)提供给驱动电压控制部时,对喷出电极18不施加驱动电压,为0[V]。 On the other hand, when the instruction of drawing the ink non-ejection signals (figure, denoted off signal) to the drive voltage control unit, the discharge electrodes 18 of the driving voltage is not applied, it is 0 [V]. 因此,从喷出电极18不产生用于喷出的电场,所以从喷出口28不喷出墨水。 Therefore, no electric field for ejected from the discharge electrode 18, so that the discharge outlet 28 does not eject ink. 而且,关于喷墨头10的墨水的喷出作用,后面详细说明。 Moreover, the role of ejecting ink of the ink jet head 10, described later in detail. 在图5中, 描画信号的1周期相当于在记录介质上,成1点或1像素所需的时间。 In FIG. 5, one cycle corresponds to the signal drawn on the recording medium 1 to a time required for one point or pixel.

在图5所示的驱动电压波形中,驱动电压的脉冲宽度设定为与描画信号的脉冲宽度相同的宽度,但是并不局限于此,可以比描画信号的脉沖宽度长或短。 In the drive voltage waveform shown in FIG. 5, the pulse width of the driving voltage of the pulse width is set to be the same width as the drawing signal, but is not limited thereto, may be longer or shorter than the pulse width of the signal drawn. 如果调整施加在喷出电极18上的驱动电压的脉冲宽度即驱动电压的施加时间变长或短,就能调整从喷出口28喷出的墨水的量,据此能调整记录介质上形成的1像素的灰度。 If the adjustment is applied to the pulse width of the driving voltage applied to the discharge electrode 18, i.e., driving voltage application time becomes longer or shorter, can adjust the discharge amount of ink discharged from the outlet 28, can be adjusted accordingly formed on the recording medium 1 gray pixels.

下面参照图l (A)、图5、图6 (A)和(B)说节月在这样的记录动作时施加在保护电极20上的交流偏压。 Referring now to Figure l (A), FIG. 5, FIG. 6 (A) and (B) applying said AC bias section months on the protective electrode 20 when such a recording operation. 图5所示的电压波形A1〜D1分别是施加在保护电极20上的交流偏压的例子。 A1~D1 voltage waveform shown in FIG. 5 are examples of the AC bias on the protective electrode 20 is applied. 图6 (A)是模式地表示在喷出电极18上施加驱动电压时的喷出口28的样子的图,图6 (B)是在喷出电极18上不施加驱动电压时(或施加低电压时)的喷出口28的样子的图。 FIG 6 (A) schematically shows the way of the discharge port when a drive voltage is applied on the discharge electrode 18 in FIG. 28, FIG. 6 (B) is a low voltage in the discharge voltage is not applied to the driving electrode 18 (or application showing the state) of the discharge port 28.

首先,说明按照电压波形Al在保护电极20上施加交流偏压时的动作。 First, the operation when the AC bias is applied to the guard electrode 20 in accordance with the voltage waveform Al. 而且,在以下的说明中,施加在保护电极20上的交流偏压(脉冲电压) 的电压波形在保护电极20上连接的保护电极控制部35中生成。 Further, in the following description, applying an alternating bias voltage (pulse voltage) on the protective electrode 20 to generate a voltage waveform of the guard electrode 35 on the control unit 20 is connected to the guard electrode. 如图5所示,如果按照电压波形A1,就具有与施加在喷出电极18上的驱动电压的信号相同的频率,该相位比驱动电压信号延迟180度的交流偏压施加在保护电极20上。 As illustrated, if in accordance with the voltage waveform A1, to a signal having a driving voltage applied to the discharge electrode 18 on the same frequency, the phase delay of 180 degrees than the driving voltage signal 5 is applied to an AC bias on the protective electrode 20 . 即在保护电极20上施加与喷出电极18上施加的驱动电压信号反相的交流偏压信号。 I.e. applying a driving voltage signal applied to the inverted upper discharge electrode 18 and the AC bias signal on the protective electrode 20. 交流偏压的高电压值Vgh设定为400[V],低电压Vgl设定为IOO[V]。 The AC bias is set to a high voltage Vgh 400 [V], is set to a low voltage Vgl IOO [V]. 在保护电极20上,与墨水的喷出以及非喷出无关,以一定周期交替切换施加高电压值Vgh和低电压Vgl 。 On the protective electrode 20, and the ejection and non-ejection of ink irrelevant to a predetermined period are alternately switched by applying a high voltage Vgh and the low voltage Vgl.

按照图5所示的电压波形Al ,控制保护电极20上施加的交流偏压时, 在对喷出电极18施加驱动电压期间,即喷出墨水期间(以下称作墨水喷出时),在保护电极20上施加低电压的偏压。 Al in accordance with the voltage waveform shown in FIG. 5, the guard electrode 20 is applied to the control of the AC bias voltage, driving voltage is applied during the discharge electrodes 18, i.e., an ink discharge period (hereinafter, referred to as ink is ejected), protective low bias voltage is applied to the upper electrode 20. 这时,在喷出口28形成与喷出电极18和保护电极20的电压差对应的电场E。 At this time, the voltage difference between the ejection outlet 28 is formed with a discharge electrode 18 and guard electrode 20 corresponding to the electric field E. . 喷出电极18处于比保护电极20还高的高电压水平,所以通过喷出电极18和保护电极20的电场E。 The discharge electrode 18 is higher than the high voltage level guard electrode 20, so that the discharge electrode 18 by the guard electrode 20 and the electric field E. ,在喷出口28的墨水中的颜色材料粒子上,如图6 (A)所示,作用向着对置电极24的方向(墨水的喷出方向)的静电力Fp因此,喷出口.28的墨水的弯液面M的位置向对置电极24上升,成为容易喷出墨水的状态。 , The color material particles in the ink discharge outlet 28 in FIG. 6 (A), the action in the direction (ink ejection direction) of the counter electrode 24 of the electrostatic force Fp Accordingly, ink discharge port .28 position of meniscus M is increased to the opposing electrode 24, a state of easy ejection of ink. 而且,墨水导向器。 Further, the ink guide. 14的顶端部分14a的墨水由基于对置电极24 的引力吸引,墨水的一部分成为墨滴,向对置电极'24喷出。 The tip portion 14a of the ink 14 by the suction-based attraction to opposing electrode 24, becomes a part of the ink droplet, ejected to the opposite electrode '24. 据此,在配置在对置电极24上的记录介质P的表面形成墨滴的点。 Accordingly, an ink droplet dots are formed on a surface of the recording medium P is disposed on the counter electrode 24. 这样,在喷出电极18上施加驱动电压的同时,在保护电极20上施加低电压的偏压,使墨水成为容易喷出的状态,所以不发生墨滴的喷出延迟,能提高喷出响应性。 Thus, while applying a driving voltage on the discharge electrode 18, guard electrode 20 is applied to the low bias voltage, the ink become readily discharged state, the ink droplet discharge delay does not occur, the ejection response can be improved sex. 另一方面,如图5的电压波形Al所示,结束对喷出电极18的驱动电 On the other hand, the voltage waveform shown in FIG. 5 Al, the discharge end of the driving electrode 18

压的施加,如果喷出电极18变为0[V](以下称作停止时),交流偏压从'低电压变为高电压。 Pressure is applied, (referred to hereinafter when stopped) if the discharge electrode 18 becomes 0 [V], an alternating bias voltage from a 'low voltage to a high voltage. 即在保护电极20上施加高电压的偏压。 I.e., a high voltage bias is applied on the protective electrode 20. 这时,在喷出口28上形成与喷出电极18和保护电极20的电压差对应的电场Ep。 At this time, an electric field Ep and the discharge electrode 18 and the voltage difference between the guard electrode 20 in the corresponding discharge port 28. 这里, 与喷出电极18相比,保护电极20处于高电压水平,所以通过喷出电极18 和保护电极20的电场Ee,在喷出口28的墨水中包含的颜色材料粒子上作用与向着对置电极24的方向相反的静电力F2。 Here, as compared with the discharge electrode 18, guard electrode 20 is at a high voltage level, the discharge electrode 18 by the electric field Ee and the protective electrode 20, acting on the color material particles contained in the ink discharge port 28 and toward the opposite direction of the electrode 24 opposite to the electrostatic force F2. 因此,喷出口28的墨水的弯液面M与作用向着对置电极24的方向的静电力Fi时相比,抑制在墨水流路30—侧(图中,向下),成为从喷出口28难以喷出墨滴的状态。 Thus, the effect of meniscus M of the ink discharge port 28 as compared to the electrostatic force Fi towards the direction of the opposed electrode 24, suppressed 30- ink passage side (in the drawing, downward) from the discharge port 28 becomes discharging states of ink droplets difficult. 在喷出电极18上施加的驱动电压变为O[V]的同时(低电压水平),通过在保护电极20上施加高电压的偏压,成为难以从喷出口28喷出墨水的状态, 墨水喷出后的墨滴的切断(液体切断性)提高。 The driving voltage applied on the discharge electrode 18 becomes O [V] while (low voltage level), by applying a high bias voltage on the protective electrode 20, a state is difficult to discharge the ink from the discharge ports 28, ink after cutting the ink droplet discharged (liquid cutting property) is improved.

如上所述,当根据图5的电压波形Al在保护电极20上施加交流偏压时,在喷出墨水前,在保护电极20上施加高电压的偏压,与向着对置电极24的方向相反方向的静电力作用在保护电极20的墨水的弯液面上,成为难以喷出墨水的状态。 As described above, when the voltage waveform in FIG. 5 Al guard electrode 20 applying an alternating bias, before the ink is ejected, a high voltage bias is applied on the protective electrode 20, opposite to the direction toward the counter electrode 24 electrostatic force in the direction of the ink meniscus protective electrode 20, a state is difficult to discharge the ink. 而当喷出墨水时,在喷出电极18上施加驱动电压,并且在保护电极20上施加低电压的偏压,向着对置电极24的方向的静电力作用于喷出口28的墨水弯液面。 When ink is ejected, the ejection driving voltage is applied on the electrode 18, and the bias applied in the protection of a low voltage electrode 20, counter electrode 24 toward the direction of an electrostatic force for ejection of the ink meniscus outlet 28 . 如果这样控制保护电极20上施加的交流偏压,就能抑制墨水的弯液面,从而在喷出电极18上施加驱动电压之前,.通过与向着对置电极24的方向相反方向的静电力,不从喷出口28喷出墨水。 If this guard electrode control 20 of the exchange bias is applied, the ink meniscus can be suppressed, so that the driving voltage is previously applied to the discharge electrode 18, electrostatic force by the direction toward the counter electrode 24 in the opposite direction, ink is not discharged from the discharge port 28. 而且,在施加驱动电压的同时或大致同时能开放喷出口28 的墨水的弯液面。 Further, while the driving voltage is applied, or substantially the same time to open the discharge port 28 of the ink meniscus. 这样在对喷出电极18施加驱动电压的同时或大琴同时, 能从喷出口28快速喷出墨水。 Thus while applying a driving voltage to the ejection electrode 18 at the same time or large piano, from the discharge port 28 to discharge the ink quickly.

另外,当在保护电极20上施加电压波形A1所示的交流偏压吋,即使施加在喷出电极18上的驱动电压低,也能可靠地控制墨水的喷出和非喷出。 Further, when applying an alternating bias voltage waveform shown inch A1 on the protective electrode 20, even when a low driving voltage applied to the discharge electrode 18, discharge can be reliably controlled and non-ejection of ink. 因此,即使降低施加在喷出电极上的电压,也能增大墨水喷出on吋和喷出off时的喷出性的差,能进行更稳定的墨滴的喷出,能进一步提高驱动电压的频率。 Accordingly, even when the voltage is reduced at the discharge electrode is applied, can increase the difference in ink ejection inch on the discharge time of the discharge and off, can be performed more stably discharge ink droplets, drive voltage can be further improved Frequency of. . .

另外,在墨水的非喷出时也施加交流偏压,所以喷出口28的墨水中的颜色材料粒子摇动,能防止墨水的过分浓縮引起的堵塞。 Further, in the non-discharge of ink is also applied AC bias, the discharge port 28 of the ink color material particles in the shaking of the ink can be prevented from clogging due to excessive concentrated.

如上所述可知,虽然也依存于喷出电极18上施加的驱动电压,但是 Understood from the above, although the driving voltage applied to the discharge electrode 18 also it depends, but

基本上按照保护电极20上施加的偏压的大小,喷出口28中形成的墨水的弯液面的状态变化。 Substantially in accordance with the magnitude of the applied bias voltage of the guard electrode 20, the meniscus 28 is formed in a state change of the ink ejection outlet. 即如果保护电极20上施加的偏压提高,则从保护电极20产生的电场加强,所以作用于喷出口28的墨水的静电力也增强。 I.e. strengthening field 20 produced improved if the protection applied to the bias electrode 20, from the guard electrode, acting on the ink discharge port 28 of the electrostatic force is also enhanced. 结果,把在喷出口28中形成的墨水的弯液面抑制在墨水流路30—侧,成为喷出口28的墨水难以喷出的状态。 As a result, the ink meniscus formed in the ejection outlet 28 side is suppressed 30- ink flow path, discharge port 28 become difficult to ink discharged state. 另一方面,在降低对保护电极20上施加的偏压时,从保护电极20产生的电场减弱,作用于墨水的静电力也减弱。 On the other hand, when lowering the bias voltage applied to the guard electrode 20, guard electrode 20 from the electric field generated diminished, the electrostatic force acting on the ink is also reduced. 结果,喷出口28中形成的墨水的弯液面开放,从喷出口28容易喷出墨水。 As a result, the discharge port of the ink meniscus in the opening 28 formed from the discharge port 28 eject ink easily. 这样,在本发明中,在保护电极20上施加交流偏压,并且控制交流偏压,调整喷出口28中形成的墨水的弯液面的状态,据此,控制墨水的喷出性。 Thus, in the present invention, applying an alternating bias voltage on the protective electrode 20, and controls the AC bias adjustment state of the ink meniscus formed in the ejection port 28, whereby the ink discharge control. 如上所述,保护电极20除了防止相邻的喷出电极间的电场干涉的功能,还具有通过施加交流偏压,调整喷出口中形成的弯液面的状态, 调整墨水的喷出形的功能。 As described above, in addition to the protective electrode 20 functions to prevent electric field interference between adjacent ejection electrodes, also having a meniscus by applying an alternating bias state, adjust the ejection port is formed to adjust the ink ejection shaped function .

下面,说明按照图5所示的电压波形B1在保护电极20上施加交流偏压时的动作。 Next, the operation when the alternating bias voltage waveform B1 shown in FIG 5 is applied on the protective electrode 20. 图5所示的电压波形B1是与喷出电极18上施加的驱动电压信号的相位不同的情况,是比电压波形A1的相位超前的情况。 Voltage waveform B1 shown in FIG. 5 is a different phase of the driving voltage signal applied to the discharge electrode 18 and the upper case, is ahead of the phase of the voltage waveform A1 case. 在电压波形B1中,施加在保护电极20中的交流偏压的下降比驱动电压的上升还早。 In the voltage waveform B1, the AC bias is applied to the drop in the protective electrode 20 earlier than the increase in driving voltage. 另外,交流偏压的上升比驱动电压的下降早。 Further, an alternating bias voltage rising earlier than the driving voltage drop.

当按照电压波形B1,在保护电极20上施加交流偏压时,在喷出电极18上施加驱动电压之前,在保护电极20上施加低电压的偏压。 When in accordance with the voltage waveform B1, the AC bias is applied on the protective electrode 20, before the drive voltage is applied on the discharge electrode 18, a low bias voltage is applied on the protective electrode 20. 据此,墨水喷出前的喷出口28的墨水与在保护电极20上施加高电压的偏压时相比,变成容易从喷出口28喷出的状态。 Accordingly, before the discharge port of the ink in the ink 28 is ejected as compared to a high voltage bias is applied on the protective electrode 20, the state becomes easily discharged from the discharge port 28. 而且,在该状态下,在喷出电极18上施加用于喷出墨水的驱动电压,所以在施加驱动电压的同时或大致同时,从喷出口28喷出墨水。 Further, in this state, the driving voltage for ejecting ink is applied on the discharge electrode 18, the driving voltage is applied at the same time or substantially the same time, ink is discharged from the discharge port 28. 这样,在墨水的喷出之前,在保护电极20上施加低电压的偏压,变为容易喷出墨水的状态,所以与按照所述电压波形A2在保护电极20上施加交流偏压时相比,能进一步有效防止墨水的喷出延迟。 Thus, prior to ink discharge, low voltage bias is applied on the protective electrode 20, the state becomes easy to discharge the ink, compared with the AC bias is applied to the protective electrode 20 in accordance with the voltage waveform A2 , can be further effectively prevent the delayed discharging ink. ' . '.

另外,按照电压波形B1,结束对喷出电极18施加驱动电压《前,即在停止墨水的喷出前,在保护电极20上施加高电压的偏压。 Before addition, depending on the voltage waveform B1, the end of the discharge electrode driving voltage is applied to the 18 ", i.e., before stopping the ejection of ink, a high voltage bias is applied on the protective electrode 20. 这样,在停止墨水的喷出前,如果在保护电极20上施加高电压的偏压,则如上所述 Thus, before stopping the ejection of ink, if the bias voltage on the high voltage is applied to guard electrode 20, as described above

喷出口28的墨水难以从喷出口28喷出。 An ink discharge port 28 discharged from the discharge outlet 28 is difficult. 在变为难以喷出墨水的状态后, 结束对喷出电极18施加驱动电压,所以不想要的墨滴的喷出或墨滴喷出后的墨滴切断(液体切断性),与按照电压波形A2在保护电极20上施加交流偏压时相比,进一步提高。 After the state becomes difficult to discharge the ink, the ejection driving voltage is applied to the end of the electrode 18, so that after the ink droplet discharging unwanted ink droplets ejected droplet or cut (cutting liquid properties), in accordance with the voltage waveform compared further improved when the AC bias is applied to A2 on the protective electrode 20.

从以上的说明可知,如果按照电压波形B1在保护电极20上施加交流偏压,就在对喷出电极18施加驱动电压的同时或大致同时喷出墨水,在驱动电压的施加结束的同时或大致同时停止墨滴的喷出,所以能进一步防止墨滴喷出的延迟,并且能进一步提高墨滴的液体切断。 From the above description, if the AC bias is applied to the protective electrode 20 in accordance with the voltage waveform B1, in the same time applying a driving voltage to the discharge electrode 18 or ink is ejected substantially simultaneously, while the driving voltage is applied to the end or substantially At the same time ejecting ink droplets is stopped, it is possible to further prevent the ink droplet discharge delay can be further improved and the liquid droplet is cut.

下面说明按照图5所示的电压波形Cl在保护电极20上施加交流偏压时的动作。 It will be described operation when the alternating bias voltage waveform shown in Figure 5 Cl is applied to the guard electrode 20.

图5的电压波形C1是施加在保护电极20上的交流偏压的高电压的施加时间(脉冲宽度)比电压波形Al还短的例子。 FIG 5 is a voltage waveform C1 is applied on the protective application time of the AC bias electrode 20 is a high voltage (pulse width) Al shorter than the example of the voltage waveform. 在该电压波形C1中, 与所述电压波形B1同样,保护电极20上施加的偏压的下降比驱动电压上升早。 In the voltage waveform C1, B1 with the same voltage waveform, drop protection bias applied to the electrode 20 earlier than the driving voltage increases. 而偏压的上升与驱动电压的下降一致。 And consistent rise and drop of the driving voltage bias. 在该例子中,在对喷出电极18施加驱动电压之前,即在墨水的喷出之前,保护电极20上施加的偏压从高电压切换为低电压,所以如电压波形B1的说明中所述,能防止墨水的喷出延迟。 In this example, before the ejection driving voltage is applied to the electrode 18, i.e., prior to discharge of ink, the protective bias applied on the electrode 20 is switched from the high voltage to a low voltage, the voltage waveform as explained in the B1 possible to prevent the ink discharge delay. 另外,在驱动电压的施加结束的同时,施加高电压的偏压, 所以能比以往提高墨水的切断。 Further, while applying the end of the driving voltage, a high voltage bias is applied, the ink can be improved than ever before cutting.

下面,说明按照图5所示的电压波形Dl在保护电极20上施加交流偏压时的动作。 Next, the operation when the alternating bias voltage waveform Dl shown in Figure 5 is applied on the protective electrode 20.

图5所示的电压波形Dl是保护电极20上施加的交流偏压的高电压的施加时间(脉冲宽度)比电压波形D1还长的例子。 Dl voltage waveform shown in FIG. 5 is a high voltage application time of the AC bias applied to the guard electrode 20 (pulse width) D1 longer than the example of the voltage waveform. 在该电压波形中,交流偏压的下降与喷出电极18上施加的驱动电压的上升一致。 In the voltage waveform, the rise and fall is consistent with the driving voltage applied to the discharge electrode 18 is an alternating current bias. 而当交流偏压的上升比驱动电压的下降还早。 When the AC bias rises earlier than the driving voltage drop. 在该例子中,在驱动电压的施加结束前, 保护电极20上施加的偏压从低电压切换为高电压,所以如电压波形B2的说明中所述那样,能进一步提高墨水的切断。 In this example, before the end of the driving voltage is applied, the protective bias applied on the electrode 20 is switched to a high voltage, the voltage waveform B2 as described in the above from a low voltage, the ink can be further improved cutting. 另外,在对喷出电极18施加驱动电压的同时,保护电极20上施加的偏压从高电压切换为低电压, 所以能防止墨水的喷出延迟。 Further, while applying a driving voltage to the discharge electrode 18, the protective bias applied on the electrode 20 is switched from the high voltage to a low voltage, it is possible to prevent the ink discharge delay. ',• ', •

以上,说明了在保护电极20上施加交流偏压时的喷墨头的墨水喷出的动作。 Been described above is applied to the ink jet head when the AC bias on the protective electrode 20 ink ejection operation. 所述说明中表示的交流偏压的电压波形A1〜D1是一个例子,如果在墨水喷出的动作时,开放弯液面以使容易喷出墨水,;在墨水的喷出动作以外时(非喷出时),抑制弯液面,从而难以喷出墨水,就能生成各种电压波形。 Description of the voltage waveform of the AC bias A1~D1 represented an example, if the operation of discharging the ink, the meniscus is open to allow easy discharging ink; an ink ejection operation at the time other than the (non- when discharge), suppression of the meniscus, thereby making it difficult to discharge the ink, can generate waveforms of various voltages. 另外,交流偏压的电压值并不局限于所述电压值,如果只在 Further, the voltage value of the AC bias voltage is not limited to the value, if only the

保护电极20上施加交流偏压,墨水不喷出,就能为任意的电压值。 AC bias is applied to the protective electrode 20, ink is not ejected can be an arbitrary voltage value.

在图5所示的电压波形中,使用矩形波,但是并不局限于此,可以使 In the voltage waveform shown in FIG. 5, a rectangular wave, but is not limited to this, can

用正弦波、三角波、梯形波。 A sine wave, triangular wave, a trapezoidal wave.

如果按照图5所示的交流偏压的电压波形A1〜D1,就与描画信号无关,即与墨水的喷出和非喷出无关,在保护电极20上交替重复施加高电压和低电压。 If nothing to do with the drawing according to the signal voltage waveform of the AC bias A1~D1 shown in FIG. 5, i.e., independent of the discharge and non-discharge of ink are repeated alternately high and low voltages applied on the protective electrode 20. 据此,在墨水的非喷出时,在保护电极20上施加高电压和低电压的偏压。 Accordingly, at the time of non-ejection of ink, applying a bias voltage of high voltage and low on the protective electrode 20. 因此,在墨水的非喷出时,喷出口的墨水中的颜色材料粒子以及弯液面摇动,能防止墨水的过度浓縮引起的堵塞。 Thus, in the non-discharge of ink, the color material particles in the ink ejection outlet and shaking the meniscus, the ink can be prevented from clogging due to excessive concentrated.

在特愿2003-203824号中公开的方法中,对图1 (A)所示的对置电极24施加交流偏压,使喷出口的墨水中的颜色材料粒子以及弯液面摇动,防止堵塞。 In the method of Patent Application No. 2003-203824 disclosed in FIG. 1 (A) represented by the counter electrode 24 is applied AC bias, so that the color material particles in the ink ejection outlet and the meniscus shake, to prevent clogging. 可是,对置电极24比较远离喷出电极18,所以当提高在对置电极24上施加的交流偏压的频率时,即驱动频率提高时,对置电极24和喷出电极18之间产生的电场不跟踪该频率,有可能无法充分摇动喷出口的墨水中的颜色材料粒子以及弯液面。 However, the counter electrode 24 further away from the discharge electrode 18, when the increase of the frequency of the AC bias applied to the counter electrode 24, i.e., when the driving frequency increases, the counter electrode 18 is generated between the discharge electrode 24 and the electric field does not track the frequency, can not be sufficiently shaken color material particles in the ink discharge opening and the meniscus. 而在本发明中,施加交流偏压的保护电极20接近喷出电极18,所以即使提高交流偏压的频率,也能可靠地摇动喷出口28的墨水中的颜色材料粒子以及弯液面,能进一步有效地防止堵塞。 In the present invention, an alternating current bias is applied to the guard electrode 20 near the discharge electrode 18, even if the increase of the frequency of the AC bias can be reliably shaken ejection outlet of the ink color material particles 28 and the meniscus can further effectively prevent clogging.

另外,可以只设置用于驱动保护电极的控制部,所以能大幅度降低驱动电路全体的成本。 Further, only be provided a control unit for driving the guard electrode, it is possible to significantly reduce the cost of the whole driving circuit.

在上述实施例中将交流偏压的高电压值与低电压值均为正的值,但也可以将高电压值设为正的值,将低电压值设为负值。 In the positive value of the high voltage in the embodiment of Example AC bias voltage values ​​are low, it may be a high voltage value to a positive value, a negative value is set to a low voltage.

下面利用图7说明将交流偏压的高电压值和低电压值分别设定为正的值和负值的情况下的实施例。 Described below using FIG. 7 embodiment in the case where the value of the AC high voltage and the low voltage bias values ​​are set to positive values ​​and negative values.

图5中表'示了图像数据或印字数据等描画信号(喷出数据信号)的波形、施加在喷出电极上的驱动电压波形(脉冲波形)、施加在保护电极上的脉冲电压的电压波形A2〜E2。 Table 5 'shows the image data or print data drawing signal (ejection data signal) waveform of a driving voltage waveform (pulse waveform) on a discharge electrode, the applied voltage waveform of the pulse voltage applied to the guard electrode A2~E2. 图5的上部所示的描画信号在墨水的喷出和非喷出的指示中利用,根据该描画信号控制墨水的喷出。 Signal shown in the upper drawing in FIG. 5 and the non-ejection of ink discharged indicates utilized, in accordance with the ink ejection control signal of the drawing. 施加在喷出电极上的驱动电压(脉冲电压)的周期和脉冲宽度如图7所示,与描画信号 Drive voltage (pulse voltage) is applied to the discharge electrodes and the pulse width of the period 7, a signal with the drawing

的周期以及脉冲宽度相同。 Same period and pulse width. 另外,施加在喷出电极lS上的驱动电压Vp例如设定为+300[V]。 Further, the driving voltage Vp is applied on the discharge electrode lS, for example, is set to +300 [V]. 当在喷出电极18上不施加驱动电压时,把喷出电极18 例如设定为O[V]。 When no drive voltage is applied on the discharge electrode 18, the discharge electrodes 18 is set to, for example, O [V]. 驱动电压的电压值并不局限于所述值,当在喷出电极18上施加驱动电压时,如果能可靠地喷出墨水,就能设定为任意的电压值。 Drive voltage value is not limited to the voltage value, when a driving voltage is applied on the discharge electrode 18, if the ink can be reliably ejected, can be set to an arbitrary voltage value.

图l (A)所示的喷墨头的记录动作时,在喷出电极18上以图7的驱动电压波形所示的定时施加驱动电压。 Figure l (A) operation of the ink jet recording head shown in the ejection driving voltage is applied to the electrode 18 shown in FIG. 7 is a timing driving voltage waveform. 即与描画信号同步,在喷出电极18 上施加用于喷出墨水的驱动电压。 That signal is synchronized with the drawing, a driving voltage for ejecting ink on the discharge electrode 18. 指示墨水的喷出的描画信号(图中,用on表示的信号),如果提供给喷出电极18上连接的驱动电压控制部33, 则以与该描画信号相同的定时对喷出电极18施加驱动电压。 Discharged drawing signal (the drawing, indicated on signal) indicative of ink, if the ejection driving voltage supplied to the control unit 18 connected to the upper electrode 33 and places the same drawing timing signal 18 is applied to the discharge electrode drive voltage. 据此,从喷出电极18产生作用于墨水的喷出的电场,从喷出口28喷出墨水。 Accordingly, an effect from the discharge electrode 18 in the field of ink ejected, ink is ejected from the discharge outlet 28.

另一方面,当指示墨水的非喷出的描画信号(图中,用off表示的信号)提供给驱动电压控制部时,对喷出电极18不施加驱动电压,为0[V]。 On the other hand, when the instruction of drawing the ink non-ejection signals (figure, denoted off signal) to the drive voltage control unit, the discharge electrodes 18 of the driving voltage is not applied, it is 0 [V]. 因此,从喷出电极18不产生用于喷出的电场,所以从喷出口2S不喷出墨水。 Therefore, the discharge electrode 18 for generating an electric field is not ejected, it is not ejected from the ink ejection outlet 2S. 而且,关于喷墨头10的墨水的喷出作用,后面详细说明。 Moreover, the role of ejecting ink of the ink jet head 10, described later in detail. 在图7中, 描画信号的1脉冲周期相当于在记录介质上形成1点或1像素所需的时间。 In FIG. 7, a pulse signal corresponding to the drawing cycle time required to form a point or pixel on the recording medium.

在图7所示的驱动电压波形中,驱动电压的脉冲宽度设定为与描画信号的脉冲宽度相同的宽度,但是并不局限于此,可以比描画信号的脉冲宽。 In the drive voltage waveform shown in FIG. 7, the pulse width of the driving voltage of the pulse width is set to be the same width as the drawing signal, but is not limited thereto, may be wider than the pulse signal is drawn. 这样,只要对喷出电极18施加的脉冲宽度、即调整驱动电压的施加时间变长或短,就能调整从喷出口28喷出的墨水的量,据此,能调整记录介质上形成的1像素的灰度。 Thus, as long as the pulse width of the discharge electrode 18 is applied, i.e. applying a driving voltage adjustment time becomes longer or shorter, can adjust the discharge amount of ink discharged from the outlet 28, and accordingly, can be adjusted is formed on the recording medium 1 gray pixels.

下面参照图l (A)、图7、图6 (A)和(B)说明在这样的记录动作时施加在保护电极20上的电压。 7, FIG. 6 (A) and (B) illustrate the voltage on the protective electrode 20 is applied at the time of such a recording operation below with reference to FIG. L (A),. 图7所示的电压波形A2〜E2分别是施加在保护电极20上的交流偏压(以下称脉冲电压)的例子。 A2~E2 voltage waveform shown in FIG. 7 are examples of the AC bias is applied (hereinafter referred to as the pulse voltage) on the protective electrode 20. 图6 (A)是模式地表示在喷出电极18上施加驱动电压时的喷出口28的样子的图,图6 (B)是在喷出电极18上不施加驱动电压时(或施加低电压时)的喷出口28的样子的图。 FIG 6 (A) schematically shows the way of the discharge port when a drive voltage is applied on the discharge electrode 18 in FIG. 28, FIG. 6 (B) is a low voltage in the discharge voltage is not applied to the driving electrode 18 (or application showing the state) of the discharge port 28.

首先,说明按照电压波形A2在保护电极20上施加脉冲电压吋的动作。 First, in accordance with the voltage waveform A2 applying a pulse voltage in the protective action of the upper electrode 20 inch. 而且,在以下的说明中,施加在保护电极20上的脉冲电压的电压波形在保护电极20上连接的保护电极控制部35中生成。 Guard electrode control portion and a voltage waveform, in the following description, the guard electrode 20 is applied to the pulse voltage on the protective electrode 20 is connected to the 35 generated. 如图7所示,如果按照电压波形A2,就具有与施加在喷出电极18上的驱动电压的信号相同的频率,该相位比驱动电压信号延迟180度的脉冲电压施加在保护电极上。 As shown in FIG 7, according to the voltage waveform A2, signals on the same frequency and the driving voltage applied on the discharge electrode 18, the phase delay signal voltage than the driving voltage pulse 180 is applied to the guard electrode. 即在保护电极20上施加与喷出电极18上施加的驱动电压信号反相的脉冲电压信号。 I.e. applying a driving voltage signal applied to the inverted upper discharge electrode 18 and the pulse voltage signal on the protective electrode 20. 脉冲电压的正电压Vg+,例如设定为300[V],负电压Vg'例如设定为200[V]。 Positive voltage + pulse voltage Vg, for example, set to 300 [V], a negative voltage Vg 'is set to, for example, 200 [V]. 在保护电极20上,与墨水的喷出以及非喷出无关,以一定周期交替切换施加正电压Vg+和负电压Vg.。 On the protective electrode 20, and the ejection and non-ejection of ink irrelevant to a predetermined period alternately switched positive voltage is applied and a negative voltage Vg Vg + ..

按照图7所示的电压波形A2,控制保护电极20上施加的脉冲电压时, 在1脉冲周期中,对喷出电极18施加驱动电压期间,即喷出墨水期间(以下称作墨水喷出时),在保护电极20上施加-200[V]的负电压Vg.。 When the time period in accordance with the voltage waveform A2 shown in FIG. 7, a control pulse voltage applied to the guard electrode 20 in a pulse period, the ejection driving voltage is applied to the electrode 18, i.e., the discharge (hereinafter referred to eject ink during ink ), is applied to -200 [V] of the negative voltage Vg on the protective electrode 20 .. 这时, 在喷出口28如图6 (A)所示,形成从喷出电极18向保护电极20的电场E。 In this case, the discharge port 28 in FIG. 6 (A), the electric field forming electrode 18 is protected from the discharge electrode 20 E. . 通过该电场E。 By the electric field E. ,在喷出口28的墨水中的颜色材料粒子上,如图6 (A) 所示,作用向着墨水表面的方向(墨水的喷出方向)的静电力F,。 , The color material particles in the ink discharge port 28 in FIG. 6 (A), the effect of the direction of the surface of the ink (ink ejection direction) of the electrostatic force F ,. 据此, 在喷出口28中存在的墨水的表面,带正电的颜色材料粒子泳动,在喷出口28中墨水浓縮。 Accordingly, the surface of the ink present in the discharge port 28, the positively charged color material particles migrate, the discharge port 28 in the ink concentrated. 而且,墨水导向器14的顶端部分14a的墨水由基于对置电极24的引力吸引,墨水的一部分成为墨滴,向对置电极24喷出。 Further, the tip portion 14a of the ink in the ink guide 14 by the suction-based attraction to opposing electrode 24, becomes a part of the ink droplet, ejected to the counter electrode 24. 据此,在配置在对置电极24上的记录介质P的表面形成墨滴的点。 Accordingly, an ink droplet dots are formed on a surface of the recording medium P is disposed on the counter electrode 24. 这样, 在喷出电极18上施加驱动电压的同时,在保护电极20上施加负电压Vg-, 使颜色材料粒子凝聚在喷出口28,能从喷出口28喷出浓縮的墨水。 Thus, while applying a driving voltage on the discharge electrode 18, a negative voltage is applied on the protective electrode 20 Vg- the color material particles are agglomerated in the ejection port 28, discharged from the discharge port 28 of the ink concentrate.

另一方面,如图7的电压波形A2所示,在l脉冲周期中,结束对喷出电极18施加驱动电压,如果喷出电极18变为O[V](以下称作停止时), 脉冲电压从负电压Vg. (-200[V])变为正电压Vg+ (+300[V])。 On the other hand, the voltage waveform A2 shown in FIG. 7, the pulse period l, the discharge end of the driving voltage applied to the electrodes 18, if the discharge electrode 18 becomes O [V] (hereinafter referred to stop), the pulse voltage from the negative voltage Vg. (-200 [V]) to a positive voltage Vg + (+300 [V]). 这时在喷出口28上,如图6 (B)所示,形成从保护电极20向喷出电极18的电场Ep。 Then in the discharge port 28, FIG. 6 (B), the protective electrode 20 is formed from the discharge electrode 18 to the field Ep. 而且,通过该电场Ee,在喷出口28的墨水中包含的颜色材料粒子上作用与向着对置电极24的方向相反的静电力F2。 Further, through the electric field Ee, acting on the color material particles contained in the ink discharge port 28 in the direction toward the counter electrode 24 opposite to the electrostatic force F2. 因此,喷出口28的墨水的弯液面M的位置与作用向着对置电极24的方向的静电力F,时相比,抑制在墨水流道30—侧(图中,向下),维持在喷出口28的墨水的浓縮性,防止墨水的不要的溢出。 Accordingly, the position and function of the discharge port 28 of the ink meniscus M toward the electrostatic force F in a direction opposed to the electrode 24, when compared to the 30- to suppress side ink flow path (FIG downward), maintained at concentrated ink ejection port 28, do not prevent the overflow of ink. 这样,在喷出电极18上施加的驱动电压变为0[V] 的同时(或低电压水平),通过在保护电极20上施加与颜色材料粒子同极性的正电压Vg+,难以喷出在喷出口28中形成的墨水,据此即使对喷墨头 Thus, the driving voltage applied on the discharge electrode 18 becomes 0 [V] at the same time (or a low voltage level), by applying the same polarity as the color material particles on the protective electrode 20 is a positive voltage Vg +, it is difficult to discharge the the ink discharge port 28 is formed, whereby even if the ink jet head

施加振动,也能防止不想要的墨水从喷出口28溢出,能提高描画对振动 Vibration is applied, can also prevent unwanted ink overflow from the discharge port 28, the vibration can improve the draw

的稳定性。 Stability.

如上所述,当根据图7的电压波形A2在保护电极20上施加脉冲电压时,在喷出墨水之际,在喷出电极18上施加驱动电压(正电压),并且在保护电极20上施加负电压Vg.,通过基于从喷出电极18向保护电极的电场的静电力,成为在喷出口28的墨水液面上颜色材料粒子泳动,墨水浓缩的状态。 As described above, when the voltage waveform A2 in FIG. 7 pulse voltage is applied to guard electrode 20, ink is ejected in the occasion of applying a driving voltage (positive voltage) on the discharge electrode 18 and the electrode 20 is applied on the protective negative voltage Vg., through the discharge port 28 of the ink level in the color material particles migrate, a concentrated ink discharge state based on the electrodes 18 to protect the electrostatic field electrodes become. 而在墨水的喷出之前,在保护电极20上施加正电压Vg+,与向着对置电极24的方向相反方向的静电力作用在保护电极20的弯液面M 上,维持在喷出口28的墨水的浓縮性,防止墨水的不要的溢出。 And before the ink is ejected, the guard electrode 20 is applied to the positive voltage Vg +, and the electrostatic force toward the opposite electrode 24 in the direction opposite to the direction of the meniscus M protective electrode 20 is maintained at the ink discharge port 28 It concentrated, to prevent ink do not overflow. 如果这样控制保护电极20上施加的脉冲电压,就能利用静电力,抑制墨水的弯液面,以使在喷出电极18上施加驱动电压之前,通过与向着对置电极的方向相反方向的静电力,墨水不从喷出口28溢出。 If such a control pulse voltage of the guard electrode 20 can use electrostatic force, suppression of the meniscus of the ink, so that the driving voltage is applied before the discharge electrode 18, in the direction of force by the counter electrode in the opposite direction electricity, ink does not overflow outlet 28 from the spray. 而且,在施加驱动电压的同时或大致同时,在喷出口28的墨水液面上凝聚颜色材料^L子,使喷出口28的墨水的弯液面开放,能快速从喷出口28喷出浓縮的墨水。 Further, while the driving voltage is applied, or substantially simultaneously, a color material aggregate ^ L in the sub-discharge port 28 of the ink level, the meniscus of the ink ejection opening of the outlet 28, can be quickly discharged from the discharge port 28 and concentrated ink.

另夕卜,在保护电极20上施加电压波形A2所示的脉冲电压时,即使施加在喷出电极18上的驱动电压低,也能可靠地控制墨水的喷出和非喷出。 Bu Xi when another pulse voltage is applied a voltage waveform shown in A2 on the protective electrode 20, even when a low driving voltage applied to the discharge electrode 18, can be reliably controlled ejection and non-ejection of ink. 因此,即使降低施加在喷出电极上的电压,也能增大墨水喷出on时和喷出off时的喷出性的差,能进行更稳定的墨滴的喷出,能进一步提高驱动电压的频率。 Accordingly, even in the reduced voltage is applied to the discharge electrodes, but also increases the difference between the discharge of ink is ejected on the ejection time and off, can be performed more stably discharge ink droplets, drive voltage can be further improved Frequency of.

另外,在墨水的非喷出时,由于在保护电极20上施加脉冲电压,所以喷出口28的墨水中的颜色材料粒子摇动,能防止墨水的过分浓縮引起的堵塞。 Further, when the non-ejection of ink, since the pulse voltage is applied to the guard electrode 20, the discharge port 28 of the ink color material particles in the shaking of the ink can be prevented from clogging due to excessive concentrated.

下面说明按照图7所示的电压波形B2在保护电极20上施加脉冲电压时的动作。 The following describes the operation when the pulse voltage is applied to the upper electrode 20 in accordance with the voltage waveform B2 shown in FIG. 7 protected. 而且,图7所示的电压波形B2是与喷出电极18施加的驱动电压信号的相位不同的情况,是比电压波形A2的相位超前的情况。 Further, the voltage waveform B2 shown in FIG. 7 is different from the phase of the drive voltage signal applied to the discharge electrode 18, the voltage waveform is leading the phase of the case where A2. 在电压波形B2中,施加在保护电极20中的脉冲电压的下降比驱动电压的上升还早。 In the voltage waveform B2, the fall of the pulse voltage is applied in the protective electrode 20 earlier than the increase in driving voltage. 另外,脉冲电压的上升比驱动电压的下降早。 Further, the pulse voltage rising earlier than the driving voltage drop.

当按照电压波形B2,在保护电极20上施加脉冲电压时,在喷出电极18上施加驱动电压之前,在保护电极20上施加负电压Vg.。 When in accordance with the voltage waveform B2, pulse voltage is applied on the protective electrode 20, before the drive voltage is applied on the discharge electrode 18, a negative voltage Vg is applied to the protective electrode 20 .. 即在喷出电极18施加0[V]时,保护电极上施加200[V]的负电压Vg.。 I.e. applying 0 [V] at the discharge electrode 18, is applied to protect the 200 [V] voltage Vg of the negative electrode .. 据此,形成从喷出电极18向着保护电极20的电场,如上所述,在喷出墨水前,喷出口28 的墨水变为浓縮的状态。 Accordingly, the discharge electrode 18 is formed from the electrode 20 toward the protective field, as described above, before the ink is ejected, the ink discharge port 28 becomes a concentrated state. 即在不喷出墨水时,对喷出口28补给墨水中的喷出口28。 I.e., when no ink is ejected, the ejection port of the ejection port 2828 supplies ink. 而且,在该状态下,对喷出电极18施加用于使墨水喷出的驱动电压,所以在驱动电压的施加的同时或大致同时从喷出口28喷出浓縮的墨水。 Further, in this state, a driving voltage is applied to the discharge electrode of the ink 18 is ejected, the driving voltage is applied simultaneously or substantially simultaneously discharged from the discharge port 28 of the ink concentrate.

另外,按照电压波形B2,结束对喷出电极18施加驱动电压之前,即在停止墨水的喷出前,在保护电极20上施加+300[V]的正电压Vg"然后, 在对喷出电极18的驱动电压的施加结束后,在保护电极20上施加+300[V] 的正电压Vg+,喷出电极18为O[V],所以如上所述,通过根据保护电极20和喷出电极18之间的电场产生的静电力,抑制喷出口28的墨水的弯液面,所以即使喷墨头10振动,也能防止墨水从喷出口不必要地溢出。 Also, before the voltage waveform in accordance with B2, to the end of discharge voltage is applied to the driving electrodes 18, i.e., before stopping the ejection of ink, is applied to +300 [V] on the protective electrode 20 is a positive voltage Vg "Then, the pair of discharge electrodes after application of the drive voltage 18 is applied to +300 [V] on the protective electrode 20 is a positive voltage Vg +, the discharge electrode 18 is O [V], it is described above, according to the protection electrode 20 and discharge electrode 18 generating an electric field between the electrostatic force to suppress the discharge port 28 of the ink meniscus vibration even if the ink jet head 10, the ink can be prevented from unnecessarily overflow discharge outlet.

从以上的说明可知,如果按照电压波形B2在保护电极20上施加脉冲电压,则在墨水的喷出前,颜色材料粒子凝聚在喷出口28中,墨水浓缩, 在对喷出电极18施加驱动电压的同时或大致同时能喷出浓縮的墨水,并且在对喷出电极18施加驱动电压结束后,喷出口的墨水不会由于振动而溢出,所以能提高墨水的浓縮性和喷出稳定性。 From the above description, if the pulse voltage is applied on the protective electrode 20 in accordance with the voltage waveform B2, then before the ink is ejected, and the color material particles agglomerated in the ejection port 28, the ink is concentrated in the ejection driving voltage is applied to the electrodes 18 simultaneously or substantially simultaneously concentrated ink can be discharged, and at the end of the discharge electrode 18 applied to the driving voltage, the discharge port of the ink does not overflow due to vibration, it is possible to increase the concentration and discharge stability of the ink .

下面说明按照图7所示的电压波形C2在保护电极20上施加脉冲电压时的动作。 Next, the operation when a voltage waveform as shown in Figure 7 C2 pulse voltage is applied on the protective electrode 20 is described.

图7的电压波形C2是施加在保护电极20上的脉冲电压的正电压Vg+ 的施加时间(脉冲宽度)比电压波形A2还短的例子。 Voltage waveform A2 C2 7 is shorter than a voltage waveform example of the positive voltage pulse voltage Vg protective electrode 20 + the application time (pulse width) is applied. 在该电压波形C2 中,与所述电压波形B2同样,保护电极20上施加的电压的下降比驱动电压上升早。 C2 is the voltage waveform, and the voltage waveform B2 Similarly, the protection lowered voltage applied to the electrodes 20 rises earlier than the driving voltage. 而施加在保护电极20上的电压的上升与驱动电压的下降一致。 And consistent decrease in the applied voltage of the guard electrode 20 and the driving voltage increases. 在该例子中,在向喷出电极18施加驱动电压之前,即在墨水的喷出之前, 保护电极20上施加的电压从正电压Vg+切换为负电压Vg.,所以如电压波形B2的说明中所述那样,在墨水的喷出前对喷出口28供给颜色材料粒子', 能把喷出口28中的墨水浓縮。 In this example, before the drive voltage is applied to the discharge electrode 18, i.e., before the ink is ejected, the protection voltage applied to the electrode 20 is switched from a positive voltage to a negative voltage Vg + Vg., So that the voltage waveform B2 as described in , as supplied to the ink is ejected prior to the ejection outlet 28 of the color material particles', 28 ink discharge ports can concentrate. 另外,在对喷出电极施加驱动电压期间, 也通过根据喷出电极18和保护电极20之间的电场而产生的静电力对喷出口28供给颜色材料粒子,能一边确保墨水的浓縮性, 一边喷出墨水。 Further, during the ejection driving voltage is applied to the electrodes, also supplied in accordance with the color material particles and the electrostatic discharge protection of an electric field between the electrodes 18 of the electrode 20 is generated on the discharge port 28, to ensure that the side of the ink concentrate, while ejecting ink. 另外,在驱动电压的施加结束的同时,对保护电极20施加正电压Vs+,所以在墨水的喷出动作后,能防止从喷出口溢出不必要的墨水。 Further, while the driving voltage is applied to the end of the guard electrode 20 is applied to the positive voltage Vs +, so that after the ink discharge operation, ink can be prevented from overflowing from the discharge port unnecessary.

下面说明按照图7所示的电压波形D2在保护电极20上施加脉冲电压 D2 will be described in accordance with a voltage waveform shown in FIG. 7 Protection pulse voltage electrode 20

时的动作。 When the action.

图7所示的电压波形D2是保护电极20上施加的脉冲电压的正电压Vg+的施加时间(脉冲宽度)比电压波形A2还长的例子。 D2 a voltage waveform shown in FIG. 7 is longer than A2 voltage waveform example of the positive voltage pulse voltage Vg applied to the guard electrode 20 is applied time (pulse width) + a. 在该电压波形中, 脉冲电压的下降与喷出电极18上施加的驱动电压的上升一致。 In the voltage waveform, the pulse voltage drop coincides with the rise in the upper electrode 18 is applied to the discharge driving voltage. 另外,脉冲电压的上升比驱动电压的下降早。 Further, the pulse voltage rising earlier than the driving voltage drop. 在该例子中,在驱动电压的施加结束前,保护电极20上施加的电压从负电压Vg.切换为正电压Vg+。 In this example, before the end of the driving voltage is applied, the voltage applied to the protective electrode 20 from the negative voltage Vg. Toggled to positive voltage Vg +. 另夕卜,在对喷出电极18施加驱动电压的同时,在保护电极20上施加的电压从正电压Vg+切换为负电压Vg.,所以在墨水的喷出前对喷出口28供给颜色材料粒子,喷出口28的墨水浓缩,能从喷出口28快速喷出该浓縮的墨水。 Another Bu Xi, while applying a driving voltage to the discharge electrode 18, the voltage applied to the protective electrode 20 is switched from a positive voltage to a negative voltage Vg + Vg., So that the color material particles supplied to the discharge port 28 is discharged before the ink , concentrated ink discharge port 28, discharged from the discharge port 28 of the quick concentrated ink. 另外,在对喷出电极18施加驱动电压时,也通过根据喷出电极18和保护电极20之间的电场而产生的静电力对喷出口28供给颜色材料粒子,能一边提高墨水的浓縮性, 一边喷出墨水。 Further, when the ejection driving voltage is applied to the electrode 18, the color material particles is also supplied by an electrostatic force according to the electric field between the discharge electrode 20 and the guard electrode 18 is generated on the side of the discharge port 28 can increase the concentration of the ink while ejecting ink.

接着,说明按照图7所示的电压波形E2在保护电极20上施加脉冲电压时的动作。 Next, the operation when a pulse voltage is applied to the electrodes 20 in accordance with a voltage waveform shown in Fig E2 in protection.

图7所示的电压波形E2是施加的脉冲电压的下降比驱动电压的上升延迟,脉冲电压的上升与驱动电压的下降一致的例子。 E2 voltage waveform shown in FIG. 7 is a drop applied pulse voltage delay than the increase in driving voltage, consistent with a decreased rise in the driving voltage of the pulse voltage of example. 因此,电压波形E2与电压波形D2的脉冲宽度相同。 Therefore, the voltage waveform of the pulse width of the voltage waveform E2 and D2 are the same. 在电压波形E2中,在对喷出电极18 施加驱动电压之后,也对保护电极20施加正电压Vg+。 E2 in the voltage waveform, after the ejection driving voltage is applied to the electrode 18, guard electrode 20 is also applied to the positive voltage Vg +. 而且,在对喷出电极18施加驱动电压开始,经过给定时间后,对保护电极20施加的电压从正电压Vg+切换为负电压Vg.。 Further, the discharge start voltage is applied to the driving electrode 18, after a lapse of a predetermined time, a voltage is applied to guard electrode 20 is switched from a positive voltage to a negative voltage Vg + Vg ..

当根据该电压波形E2对保护电极20施加脉冲电压时:在施加驱动电压之前,在保护电极上施加+300[V]的正电压Vg+。 When a pulse voltage is applied to the guard electrode 20 from the voltage waveform E2: before applying a driving voltage, applied to +300 [V] on the protective electrode positive voltage Vg +. 在喷出电极18上施加驱动电压之前,喷出电极18为0[V](或低电压水平),在保护电极20上施加+300[V]的电压。 Applying a driving voltage until the voltage on the discharge electrode 18, the discharge electrode 18 is 0 [V] (or a low voltage level), applied to +300 [V] on the protective electrode 20. 因此,在该状态下,在喷出口28形成从保护电极20 向喷出电极的电场,通,过基于该电择的静电力,抑制墨水的弯液面,防止墨水的不要的溢出。 Thus, in this state, the discharge port 28 is formed from the protective electrode 20 to the discharge electrode field, through, through the electrical power force based on the selection, suppression of the meniscus of the ink, do not prevent the overflow of the ink.

进而,在经过一定时间后,如果保护电极20 士施加的电压切换为-200[¥]的负电组Vg.,就如上所述,形成从喷出电极18向着保护电极20的电场。 Furthermore, after a given time elapses, if the voltage switch 20 Shishi Jia guard electrode Vg is -200 negatively charged groups [¥] in., Just as described above, the discharge electric field is formed from the electrode 18 toward electrode 20 protection. 而且,通过根据该电场而产生的静电力,在喷出口2S中存在的墨水的表面上颜色材料粒子泳动,在喷出口28中墨水浓縮。 Further, according to the electric field by the electrostatic force generated, the discharge port present in the upper surface 2S of the ink color material particles migrate in the ink discharge port 28 was concentrated. 而且,墨7jl Moreover, the ink 7jl

导向器14的顶端部分14a的墨水由基于对置电极24的引力吸引,墨水的一部分成为墨滴,向对置电极24喷出。 The tip portion 14a of the ink guide 14 is attracted by the attraction based on the counter electrode 24, becomes a part of the ink droplet, ejected to the counter electrode 24.

而且,在脉冲电压的施加结束的同时,在保护电极20上施加正电压Vg+,如上所述,通过静电力抑制喷出口28的墨水的弯液面。 Further, while applying a pulse voltage is ended, the guard electrode 20 is applied to the positive voltage Vg +, as described above, by suppressing electrostatic discharge outlet 28 of the ink meniscus. 据此,在墨水的喷出动作后,能防止不必要的墨水从喷出口溢出。 Accordingly, after the ink discharge operation can prevent unnecessary ink overflows from the discharge port.

这里,表示使电压波形D2的相位延迟,从而保护电极20上施加的脉冲电压的上升与驱动电压的下降一致的例子,但是并不局限于此,也可以使保护电极20上施加的脉冲电压的下降比驱动电压的上升延迟,使脉冲电压的上升比驱动电压的下降早或延迟。 Here, D2 represents the voltage waveform of the phase delay, so as to protect the same rise and drop of the driving voltage pulse voltage applied to the electrode 20 of example, but is not limited to this, the pulse voltage may be on the protective electrode 20 applied falling delay than the increase in driving voltage, the pulse voltage of the rising earlier or decreased driving voltage delay.

以上说明了在保护电极20施加脉冲电压时的喷墨头的墨水喷出动作。 Discharging operation in the above described ink jet head protection when a pulse voltage is applied to electrode 20. 无论是所述电压波形A2〜E2中的任一的情况下,也基本上在不施加驱动电压时的一定期间中,在保护电极上施加正的电压Vg+,在喷出电极和保护电极之间形成电场,禾拥由该电场产生的静电力,使颜色材料粒子凝聚到喷出口上,使喷出口的墨水浓縮。 Whether a certain period of time under any one of the voltage waveform A2~E2 case, substantially no driving voltage is applied, a positive voltage is applied to the protective electrode Vg +, between the discharge electrode and the guard electrode an electric field, He Yong generated by the electrostatic field, so that the color material particles are aggregated to the discharge port, so that ink ejection outlet concentrated. 然后,在墨水的喷出动作时,即施加驱动电压时,从喷出口把浓縮的墨水作为墨滴喷出。 Then, when the ink discharge operation, i.e., when the driving voltage is applied from the discharge port as an ink droplet ejected concentrated.

^外,所述说明中表示的脉冲电压的电压波形A2〜E2是一个例子, 如果当墨水的喷出动作时,为了容易喷出墨水,开放弯液面,在墨水的喷出动作以外时(非喷出时),抑制弯液面,从而难以喷出墨水,就能生成各种电压波形。 ^ In addition, the voltage waveform A2~E2 described pulse voltage is represented an example, if, when the ink discharge operation, easy to discharge the ink, the meniscus is open, than when the operation of discharging ink ( when the non-ejection), suppression of the meniscus, thereby making it difficult to discharge the ink, can generate waveforms of various voltages. 另外,脉冲电压的电压值并不局限于所述电压值,如果只在保护电极20上施加脉冲电压,墨水就不喷出,就能为任意的电压值。 Further, the voltage value of the pulse voltage is not limited to the voltage value, only if the pulse voltage is applied to the protective electrode 20, the ink is not discharged, the voltage can be any value. 保护电极20上施加的脉冲电压的正电压Vg+,由于防止该脉冲电压的施加引起的不必要的喷出、防止与喷出电极之间的放电破坏等理由,优选对喷出电极18施加的on时的驱动电压的300%以下,并且与对喷出电极18施加的off ,的电压的电位差为2000[V]以下,而且,脉冲电压的负的电压Vg.由于防止与喷出电极18之间的放电破坏等理由,优选与对喷出电极18 施加的on时的电压的电位差为2000[V]以下。 Vg voltage is the positive voltage pulse applied to the guard electrode 20 +, to prevent unnecessary discharge due to the application of the pulse voltage induced to prevent damage on the discharge between the discharge electrodes and other reasons, the discharge electrode 18 is preferably applied to driving voltage when 300% or less, and is applied with the off discharge electrode 18, the potential difference between the voltages is 2000 [V] or less, and, a negative voltage pulse Vg voltage due to the discharge electrode 18 to prevent the grounds between the discharge destruction, preferably a potential difference of the voltage on the discharge electrode 18 applied is 2000 [V] or less. .

. 另夕卜,当对保护电极20施加的保护电极20的信号相位对于喷出电极18上施加的驱动电压的信号偏移时,优选保护电极20上施加的脉冲电压的信号偏移对于驱动电压的信号占空比为+40%—40%的范围。 Another Bu Xi, when the driving voltage signal offset phase of the signal applied to the guard electrode 20, guard electrode 20 to the upper discharge electrode 18 applied pulse voltage offset signal applied to the guard electrode 20 is preferably the drive voltage signal duty cycle is 40% + -40% range.

在图7所示的电压波形中,使用矩形波,但是并不局限于此,可以使 In the voltage waveform shown in FIG. 7, a rectangular wave, but is not limited to this, can

用正弦波、三角波、梯形波。 A sine wave, triangular wave, a trapezoidal wave.

如果按照图7所示的脉冲电压的电压波形A2〜E2,就与描画信号无关, 即与墨水的喷出和非喷出无关,在保护电极20上交替重复施加正电压Vg+ 和负电压Vg.。 If nothing to do with the drawing according to the signal voltage waveform A2~E2 pulse voltage shown in Figure 7, i.e. the discharge and non-discharge of ink is irrelevant, the guard electrode are alternately repeatedly applied a positive voltage and a negative voltage Vg Vg + 20. . 即,即使不喷出墨水的情况下在保护电极20上施加正电压Vg+和负电压Vg,。 That is, even if the ink is not discharged is applied a positive voltage and a negative voltage Vg Vg + on the protective electrode 20 ,. 据此,在墨水的非喷出时,喷出口的墨水中的颜色材料粒子以及弯液面摇动,能防止墨水的过度浓縮引起的堵塞。 Accordingly, at the time of non-ejection of ink, the color material particles in the ink ejection outlet and shaking the meniscus, the ink can be prevented from clogging due to excessive concentrated.

在特愿2003-203824号中公开的方法中,对图1 (A)所示的对置电极24施加脉冲电压,使喷出口28的墨水的颜色材料粒子以及弯液面摇动, 防止堵塞。 In the method disclosed in Japanese Application No. 2003-203824, the application of FIG. 1 (A) represented by the counter electrode voltage pulse 24, so that the ink discharge port 28 of the coloring material particles and shaking the meniscus, to prevent clogging. 可是,对置电极24比较远离喷出电极18,所以当提高在对置电极24上施加的脉冲电压的频率时,即驱动频率提高时,对置电极24和喷出电极18之间产生的电场不跟踪该频率,有可能无法充分摇动喷出口的墨水中的颜色材料粒子以及弯液面。 However, when the counter electrode 24 further away from the discharge electrode 18 to increase the frequency when the pulse voltage applied to the counter electrode 24, i.e., the driving frequency is increased, an electric field generated between the discharge electrode 24 and the counter electrode 18 It does not track the frequency may not be sufficiently shaken color material particles in the ink discharge opening and the meniscus. 而在本发明中,施加脉沖电压的保护电极20接近喷出电极18,所以即使提高脉冲电压的频率,也能可靠地摇动喷出口28的墨水中的颜色材料粒子以及弯液面,能进一步有效地防止堵塞。 In the present invention, the pulse voltage applied to the guard electrode 20 is close to the discharge electrode 18, even if increasing the frequency of the pulse voltage, discharge can be reliably shaken color material particles in the ink outlet 28 and the meniscus can be more effectively to prevent clogging.

另外,可以只设置用于驱动保护电极的保护电极控制部,所以能大幅度降低驱动电路全体的成本。 Further, protection may be provided only for driving the guard electrode control portion of the electrode, it is possible to significantly reduce the cost of the whole driving circuit. ,

以上说明了在喷墨头的保护电极20上施加交流偏压(脉冲电压)时 The above-described AC bias is applied (pulse voltage) on the protective electrode 20 of the ink jet head

的动作。 Actions.

下面通过说明喷墨头10中的墨滴R的喷出作用,更加详细说明本发明。 The following description is ejected by action of the ink droplets R of the ink jet head 10, the present invention is further described in detail.

如图l (A)所示,在喷墨头10中,通过包含未图示的泵的墨水循环机构,包含与记录时在喷出电极18上施加的电压同极性,例如带正(+) 电的颜色材料粒子的墨水Q在墨水流道30的内部在箭头方向(图中从左向右)循环。 FIG. L (A), in the ink jet head 10, the ink circulation mechanism including a pump (not shown), comprising the recording in the same polarity as the voltage applied to the discharge electrode 18, for example, with a positive (+ ) material particles electrically Q color inks from left to right) circulates in the direction of arrow (in FIG. 30 of the interior of the ink flow path.

另外,在记录时,把记录介质P提供给对置电极24,通过带电部件26带上与颜色材料粒子相反极性即负的高电压(作为一例,'-1500[V]), 在偏压带电的状态下,.静电吸附在对置电极24上。 Further, at the time of recording, the recording medium P is supplied to the counter electrode 24, a charging member 26 by the belt material particles with the opposite polarity i.e. color negative high voltage (as one example, '- 1500 [V]), bias the charged state. electrostatically attracted on the counter electrode 24. 在该状态下,进行控制,从而一边使记录介质P (对置电极24)和喷 In this state, control is performed so that while the recording medium P (counter electrode 24) and the discharge

墨头10相对移动, 一边按照供给的图像数据,用驱动电压控制部33在喷出电极18上施加脉冲电压(以下称作驱动电压)。 Relatively moving the ink head 10, while the image data supplied in accordance with 33 ejection pulse voltage is applied on the electrode 18 with a drive voltage control unit (hereinafter referred to as a drive voltage). 而且,基本上通过驱动电压的施加的on/off,使喷出on/off,按照图像数据把墨滴R调制喷出, 在记录介质P上记录图像。 Further, the drive voltage is substantially applied to on / off, the discharge on / off, ejecting ink droplets R modulated according to the image data, the image recorded on the recording medium P.

这里,在喷出电极18上不施加驱动电压的状态下(或施加电压为低电压水平的状态下),即在对置电极24上施加偏压的状态下,在墨水Q中作用对置电极24和墨水Q的颜色材料粒子(带电粒子)之间作用的库^^ 引力、颜色材料粒子间的库仑斥力、载液的粘性、表面张力、感应极化力等。 A state in the state where no driving voltage is applied on the discharge electrode 18 (or the applied voltage to a low voltage level state), i.e., bias voltage applied on the counter electrode 24, acting on the opposing electrode ink Q 24 and libraries ^^ attraction, Coulomb repulsion among the color material particles, a carrier liquid viscosity, surface tension, the force acting between the induced polarization Q ink color material particles (charged particles) and the like. 而且,而这些力合成颜色材料粒子或载液移动,如图1 (A)所示, 墨水Q成为从喷出口28隆起若干的弯液面,取得平衡。 Moreover, these synthetic color material particles or the force moving the carrier liquid, as shown in FIG 1 (A), the ink Q is raised several outlet 28 from the discharge meniscus balance. 这时如上所述, 在喷出电极18上不施加驱动电压的状态下,基本上在保护电极20不施加正的脉冲电压或高电压的脉冲电压。 In this case as described above, the state where no drive voltage is applied on the discharge electrode 18, guard electrode 20 is not substantially applied to the positive pulse voltage or a high voltage pulse voltage. 即产生从保护电极20到喷出电极18 的电场。 I.e., produced from the field guard electrode 20 to the discharge electrode 18. 因此,向着保护电极20的静电力与在保护电极20上不施加偏压时相比,从保护电极20产生的电场的部分变小。 Thus, as compared with when no bias is applied to the protective electrode 20, an electrostatic force toward the protective electrode 20, an electric field from the protective electrode portion 20 becomes small. 即防止墨水从喷出口28 的溢出。 I.e. to prevent overflow of the ink from the discharge port 28. 而且,通过基于向着对置电极24的静电力的库仑引力的合成, 颜色材料粒子用所谓的电泳向由对置电极24带电的记录介质P —侧移动。 Side movement - and, by an electrostatic force based on toward the counter electrode 24 Coulomb attraction synthetic, charged color material particles 24 from the counter electrode to the recording medium P so-called electrophoresis. 因此,在喷出口28中形成的弯液面M中,成为墨水Q浓縮的状态。 Accordingly, the meniscus M formed in the discharge port 28, the ink Q to become a concentrated state. 这样, 不但防止墨水的溢出,而且在喷出口28使墨水浓縮。 Thus, not only prevent spillage of the ink, and the ink discharge port 28 was concentrated.

从该状态对喷出电极18施加驱动电压。 Driving voltage is applied from the discharge electrode 18 in this state. 这时如上所述,在保护电极20上施加负电压或低电压的偏压。 In this case as described above, a negative bias voltage is applied or a low voltage at the guard electrode 20. 据此,在墨水上,来自施加偏压的对置电极的作用上,重叠来自施加驱动电压的喷出电极的作用和来自施加脉冲电压或交流偏压的保护电极的作用,引起在刚才的复合上进而由于这些作用的重叠复合的运动。 Accordingly, in the ink, the effect of the counter electrode from a bias voltage is applied, the overlapping effect of the discharge electrode from the driving voltage is applied from the guard electrode and the effect of applying a pulsed voltage or AC bias is caused in the composite just Further on the composite due to the overlapping effect of the movement of these. 而且,由于对喷出电极18施加驱动电压和对保护电极20施加脉冲电压或交流偏压而产生的电场,,颜色材料粒子以及载 Further, since the electric field is applied to the driving voltage to the discharge electrode 18 and the AC bias or pulse voltage is applied to the protective electrode 20 ,, generated color material particles and a carrier

液作用静电力。 Liquid electrostatic force. 通过该静电力,颜色材料粒子以及i液向偏压(对置电极) By this electrostatic force, and the color material particles to bias the liquid i (the counter electrode)

一侧即记录介质P吸引,喷出口28中形成的弯液面M向上方成长,在喷出口28的上方形成大致圆锥状的墨水液柱即所谓的液锥。 That side of the ink liquid column P to attract the recording medium, the meniscus M formed in ejection outlet 28 upward growth, a substantially conical shape over the discharge outlet 28, i.e. a so-called liquid cone. 另外,与刚才同样,弯液面的墨水Q浓縮,成为具有多个颜色材料粒子的几乎均匀的高浓度状态。 Further, with just the same, the meniscus of the ink Q concentrated become nearly uniform state having a high concentration of a plurality of color material particles. .对喷出电极IS开始施加驱动电压后,如果经过有限的时间,则根据颜色材料粒子的移动,在电场强度高的弯液面的顶端部分,颜色材料粒子和载液的表面张力的平衡崩溃,弯液面急剧拉伸,形成称作曳丝的直径数 After the start of the discharge electrode IS driving voltage is applied, if after a limited period of time, according to the movement of the color material particles, at high electric field intensity of meniscus tip portion, the color balance of the surface tension of the carrier liquid and the material particles collapse meniscus abruptly stretched form known as drag wire diameter of several

)im〜数十^m的细长的墨水液柱。 ) Im~ tens m ^ elongated liquid column of ink.

如果经过有限的时间,则曳丝成长,由于曳丝的成长、瑞利/晶片不稳定性引起的振动、弯液面内的颜色材料粒子的分布不均匀、与弯液面有关的静电场的分布不均匀等的相互作用,曳丝截断。 If the elapsed time is limited, the growth of the drag wire, vibrations due to the growth of the drag wire, Rayleigh / wafer instability caused by uneven distribution of the color material particles within the meniscus, the meniscus associated electrostatic field interaction uneven distribution of the drag wire cut. 然后截断的曳丝成为墨滴R并喷出,向记录介质P飞翔,并且由对置电极的偏压吸引,弹落到记录介质P上。 Then drag the wire to become cut and the ink droplet R is ejected to fly to a recording medium P, and the suction by the bias of the counter electrode, bombs dropped onto the recording medium P. 而且,曳丝的成长和截断、颜色材料粒子向弯液面(曳丝) 的移动是在施加驱动电压时连续发生。 Moreover, growth and trailing wire cut, the color material particles are continuously moved or meniscus (drag wire) when the drive voltage is applied. 因此,通过调整施加驱动电压的时间,能调整l像素或l点的墨滴的喷出量。 Thus, by adjusting the time for applying the driving voltage, the discharge amount of ink droplets can be adjusted l l pixels or dots.

另外,在结束(喷出off)电压的施加的时刻,回到在对置电极24和保护电极20上施加偏压的刚才的弯液面的状态。 Further, at the time of application of the end (discharge off) voltage is applied back to the state just bias of the meniscus on the counter electrode 24 and guard electrode 20.

这里,在本实施例的喷墨头中,如图l (A)所示,喷出电极1S在墨水流道30露出,与墨水Q接触。 Here, in the ink jet head of the present embodiment, FIG. L (A), the discharge electrode 1S ink flow path 30 is exposed in contact with the ink Q. 因此,如果在墨水流道30中与墨水Q 接触的喷出电极18上施加驱动电压(喷出on),就把提供给喷出电极18 的电荷的一部分注入墨水Q,位于喷出口28和喷出电极18之间的墨水Q 的电传导率提高。 Accordingly, if the driving voltage is applied (ejected on) on the discharge electrode 18 in the ink flow passage 30 is in contact with the ink Q, a portion is provided to put the charge injection electrode 18 discharge ink Q, located discharge outlet 28 and discharge the ink Q, the electrical conductivity between the electrode 18 is improved. 因此,在本实施例的喷墨头IO中,在喷出电极iS上施加驱动电压时(喷出on时),成为容易喷出墨滴R的状态(喷出性提高)。 Thus, in the ink jet head IO embodiment of the present embodiment, the drive voltage is applied on the discharge electrode iS (ejection ON time), a state of easy ejection of ink droplets R (ejection improved). 而且,在该状态下,按照上述的喷出原理喷出墨水,所以在记录介质上形成高质量的图像。 Further, in this state, in accordance with the principles of the above-described discharge ink discharge, so a high-quality image on a recording medium.

进而,在本实施例中,喷墨头10的喷出口28在墨水流方向为细长的长孔形状,所以墨水容易流入喷出口28的内部,对喷出口28的墨水供给性提高。 Further, in the present embodiment, the discharge port 10 of the ink jet head 28 in the ink flow direction of the elongated long hole shape, the ink easily flows inside the discharge port 28 to discharge port 28 of the ink supply is improved. 因此,对顶端部分14a的墨水粒子供给性也提高。 Thus, the ink particles supplying property to the tip portion 14a is also improved. 因此,即使提高图像记录时的喷出频率,以高速连续使墨滴喷出,也能在记录介质上稳定地形成所需尺寸的点。 Thus, even if the ejection frequency to improve the image recording, a high speed continuous eject ink droplets, it is possible to stably form dots of the desired size on the recording medium. 根据本发明,如果考虑图像的输出时间,就能实现5kHz,优选10 kHz,更优选15 kHz。 According to the present invention, in consideration of the image output time can be achieved 5kHz, preferably 10 kHz, and more preferably 15 kHz. 通过使喷出口28的纵横比为1 以上,墨水流变得平滑,能防止在喷出口28的堵塞。 By making the discharge port 28 of an aspect ratio of 1 or more, the ink flow becomes smooth and can be prevented from clogging the discharge port 28.

下面说明本发明的喷墨头10中使用的墨水。 The following describes an ink jet head 10 according to the present invention is used. . 通过把颜色材料粒子分散到载液中,得到墨水Q。 By the color material particles are dispersed in the carrier liquid, to obtain an ink Q. 载液优选是具有高的电阻率(109Q 'cm以上,优选101()0 'cm以上)的介电性液体(非水溶液)。 The carrier liquid preferably having a high resistivity (109Q 'cm or more, preferably 101 () 0' cm or more) a dielectric liquid (non-aqueous). 如果载液的电阻低,则通过喷出电极上施加的驱动电压,载液自身受到电荷注入而带电,不发生颜色材料粒子的浓縮。 If the resistance of the carrier liquid is low, the drive voltage applied to the ejection electrodes, the carrier liquid itself is charged by charge injection, and concentrated color material particles does not occur. 另外,电阻低的载液有可能产生相邻的喷出电极之间的电导通,所以不适合。 Further, the carrier liquid has a low resistance electrical conduction may occur between the adjacent discharge electrodes, it is not suitable.

作为载液而使用的介电性液体的介电常数优选为5以下,更优选为4 以下,进而优选为3.5以下。 Dielectric liquid used as the carrier liquid is preferably a dielectric constant of 5 or less, more preferably 4 or less, further preferably 3.5 or less. 通过采用这样的介电常数的范围,对载液中的颜色材料粒子有效地作用电场,容易产生泳动。 By using such a dielectric constant range, electric field effectively acts on the color material particles in the carrier liquid, prone to migrate.

而且,该载液的固有电阻的上限值优选为1016Q *cm左右,介电常数的下限值优选为1.9左右。 Further, specific resistance of the carrier liquid of the upper limit is preferably about 1016Q * cm, a dielectric constant lower limit is preferably about 1.9. 载液的电阻之所以为所述范围是因为如果电阻变低,则低电场下的墨水喷出变差,优选介电常数为所述范围的理由是如果介电常数提高,则由于溶剂的极化,电场缓和,据此形成的点的颜色变淡,或产生渗出。 Reason why the resistance of the carrier liquid to the range is because if the resistance is reduced, the ink discharge is deteriorated at low electric field, the dielectric constant preferably ranges if the dielectric constant is increased, the polar solvents since of the electric field relaxation, whereby formation of a color point fades, or bleed out.

作为载液而使用的介电性液体,有优选直链状或支链状的脂肪族烃、 脂环式烃、或芳香族烃、以及这些烃的卤素取代物。 Dielectric liquid used as carrier liquid, there is preferably a linear or branched aliphatic hydrocarbons, alicyclic hydrocarbons, or aromatic hydrocarbons, and halogen substitution products of these hydrocarbons. 例如能单独或混合使用己垸、庚烷、辛烷、异辛烷、癸烷、异癸烷、萘烷、壬烷、十二烷、异十二烷、环己烷、环辛烷、环癸烷、苯、甲苯、均三甲苯、合成异构烷油(isopar) C、合成异构垸油E、合成异构烷油G、合成异构烷油H、合成异构垸油L、合成异构垸油M(合成异构垸油:埃克森公司的商品名)、shell zo170、 shell zo171 (shell zol: shell公司的商品名)、阿姆斯科OMS、阿姆斯科460溶剂(阿姆斯科:Spirits公司的商品名)、硅油(例如信越硅公司的KF-96L)。 For example, can be used alone or in combination hexyl embankment, heptane, octane, isooctane, decane, isodecane, decalin, nonane, dodecane, isododecane, cyclohexane, cyclooctane, decane, benzene, toluene, mesitylene, Isopar (isopar) C, synthetic oils embankment isomers E, Isopar G, Isopar H, embankment synthetic isomerized oil L, synthesis isomerized oil embankment M (synthetic isomerized embankment oil: trade name of Exxon), shell zo170, shell zo171 (shell zol: shell under the trade name), the OMS Scott Armstrong, Neil Scott 460 solvent ( Scott Armstrong: Spirits trade names), silicone oils (e.g., the Shin-Etsu silicone Co., KF-96L).

分散在这样的载液中的颜色材料粒子可以把颜色材料自身作为颜色材料粒子分散在载液中,但是优选含有用于提高定影性的分散树脂粒子。 Such a color material particles are dispersed in a carrier liquid can be a color material itself as the color material particles are dispersed in the carrier liquid, but is preferably a dispersion containing the resin particles for improving the fixing property. 当含有分散树脂粒子时, 一般是用分散树脂粒子的树脂材料覆盖颜料等, 作为树脂覆盖粒子的方法, 一般是用染料等把分散树脂粒子着色,作为着 When the dispersion containing the resin particles, the pigment is usually covered with a resin material dispersed resin particles and the like, as a method of covering the resin particles, generally with a dye or the like to the dispersion resin particles colored with a

色粒子的方法。 Particle color.

作为颜色材料,从以往能使用流路墨水组合物、印刷用(油性)墨水组合物、或静电照相用液体显影剂中使用的颜料和染料。 As the coloring material, can be used from the previous passage of the ink composition, printing (oil-based) ink composition, or an electrostatic photographic liquid developer pigment and dye used.

作为颜色材料而使用的颜料,无论无机颜料、有机颜料,能使用在印刷技术领域中一般使用的颜料。 A color material used as the pigment, regardless of inorganic pigments, organic pigments, the pigment can be used in the printing art generally used. 具体而言,未特别限定,能使用例如碳黑、镉红、钼红、铬黄、镉黄、钛黄、氧化铬、浓绿色颜料、钴绿、群青蓝、 铁蓝、钴蓝、偶氮系颜料、酞菁系颜料、奎酮系颜料、异吲哚满酮系颜料、 Specifically, not particularly limited, and can be used, for example, carbon black, cadmium red, molybdenum red, chrome yellow, cadmium yellow, titanium yellow, chromium oxide, pigment dark green, cobalt green, ultramarine blue, iron blue, cobalt blue, azo pigments, phthalocyanine pigments, Kui-based pigments, isoindolinone-based pigments,

二噁垸系颜料、杜烯类颜料、茈系颜料、迫位酮(perinoe)系颜料、硫靛系颜料、奎酞酮系颜料、金属配位化合物颜料等以往公知的颜料。 Embankment dioxane pigment, Du-based pigments, perylene-based pigment, peri-one (perinoe) pigments, conventionally known pigments thioindigo pigments, quinophthalone pigments, metal complex pigments and the like.

作为颜色材料而使用的颜料,优选使用偶氮染料、金属配位化合物染料、奈酚染料、蒽醌染料、靛蓝染料、正碳染料、醌亚胺染料、吨(xanthene) 染料、苯胺染料、喹啉染料、硝基染料、硝酸灵染料、苯醌染料、萘醌染料、酞花青染料、金属酞花青染料等的油性染料。 Materials used as the color pigments, preferably azo dyes, metal complex dyes, naphthol dyes, anthraquinone dyes, indigo dyes, carbonium dyes, quinone imine dyes, t (xanthene) dyes, aniline dyes, quinoline morpholine dyes, nitro dyes, spirit nitric acid dyes, benzoquinone dyes, naphthoquinone dyes, phthalocyanine dyes, metal phthalocyanine dyes and the like oily dye.

作为分散树脂粒子,例如可以举出:松香类、松香改性酚醛树脂、醇酸树脂、甲基丙烯酸类聚合物、聚氨酯、聚酯、聚酰胺、聚乙烯、聚丁二烯、聚苯乙烯、聚乙酸乙烯、聚乙烯醇的聚甲醛改性物、聚碳酸酯等。 As the dispersion resin particles include, for example: rosin, rosin-modified phenolic resin, an alkyd resin, a methacrylic polymer, polyurethane, polyester, polyamide, polyethylene, polybutadiene, polystyrene, polyvinyl acetate, polyvinyl alcohol modified polyoxymethylene, polycarbonate and the like.

其中,从粒子形成的容易程度的观点出发,优选是重量平均分子量为2000-1000, 000的范围内,并且多分散度(重均分子量/数均分子量)为1.0-5.0范围内的聚合物。 Wherein, ease of particle formation from the viewpoint of, preferably a weight average molecular weight of 2000-1000, in the range of 000, and the polydispersity (weight average molecular weight / number average molecular weight) of the polymer in the range of 1.0 to 5.0. 进而,从所述定影的容易程度的观点出发,优选软化点、玻璃转变点或熔点的任意一个为4CTC〜12(TC的范围内的聚合物。 Further, from the viewpoint of ease of fixing, polymers within the scope of 4CTC~12 (TC is any preferred softening point, glass transition point or a melting point of.

在墨水Q中,优选颜色材料粒子的含量(颜色材料粒子或分散树脂粒子的合计含量)对于墨水全体,以0.5〜30重量%的范围包含。 In the ink Q, the content of the color material particles is preferably (color material particles or the resin particles dispersed total content) For all the ink, the range of 0.5~30 wt% contained. 如果颜色材料粒子的含量少,则容易发生印刷图像浓度不足,难以取得墨水Q和记录介质P表面的亲和性,无法取得牢固的图像的问题,而如果含量多,就产生难以取得均匀的分散液,或容易产生喷墨头等中的墨水Q的堵塞,无法取得稳定的墨水喷出的问题。 If the content of the color material particles is less prone to the printed image density is insufficient, the affinity of the ink is difficult to obtain Q and the surface of the recording medium P, the problem can not achieve a strong image, and if the content is more difficult to obtain produces a uniform dispersion liquid, an inkjet head or prone to clogging of the ink Q, the problem can not obtain a stable ink ejection.

另外,优选分散在载液中的颜色材料粒子的颜色材料粒子的平均粒径为0.1〜5)am,更优选为0.2〜1.5pm,进而优选为0.4〜1.0^im。 The average particle diameter of the color material particles is preferably a color material particles dispersed in the carrier liquid is 0.1~5) am, more preferably 0.2~1.5pm, more preferably 0.4~1.0 ^ im. 该粒径由CAPA-500(崛场制作所(株)制造的商品名)求出。 (Trade name, manufactured by HORIBA (KK)) of the particle diameter determined by a CAPA-500.

把颜色材料粒子分散到载液中后(按照必要,可以使用分散剂),通过在载液中添加带电控制剂,使颜色材料粒子带电,带电的颜色材料粒子分散到载液中构成墨水Q。 After the color material particles are dispersed in the carrier liquid (as necessary, a dispersant may be used), by adding a charge control agent in a carrier liquid, the color of the material charged particles, the charged color material particles dispersed in the carrier liquid constituting the ink Q. 而且,在颜色材料粒子的分散时,按照必要, 可以添加分散剂。 Further, when the dispersion of the color material particles, according to need, a dispersing agent may be added. . .

带电控制剂作为一个例子,可以使用电子照相液体显影剂中使用的各种控制剂。 As one example, charge control agent, various control agents in electrophotographic liquid developer used. 另外,也能利用"最近的电子照相显影系统和粉末材料的开发和实用化"D9〜148页、电子照相学会编辑的"电子照相技术的基础和应用"497〜505页(corona公司,1988年)、原崎勇次"电子照相"16 (No.2)、 44页(1977年)中记载的各种带电控制剂。 Further, use can also be "recent electrophotographic development systems, and development and practical use of the powder material" D9~148 page electrophotographic Institute edited "basic and applied electrophotography" pages 497~505 (Corona Company, 1988 ), Yuji Harasaki, "electrophotographic" 16 (No.2), 44 of various charge control agent this page (1977) are described.

而且,颜色材料粒子如果与施加在控制电极上的驱动电压为同极性, 就可以带电为正电荷和负电荷的任意一个。 Further, if the color material particles and the driving voltage applied to the control electrode of the same polarity, the charging can be any one of positive charge and negative charge.

另外,颜色材料粒子的带电量优选为5〜200 nC/g,更优选10〜 150pC/g,进而优选15〜100)aC/g的范围。 Further, the color material particles is preferably charged amount of 5~200 nC / g, and more preferably 10~ 150pC / g, more preferably 15~100) aC range / g.

另外,通过带电控制剂的添加,介电性溶剂的电阻变化,所以以下定义的分配率P优选为50。 Further, by the charge control agent is added, the variable resistance of the dielectric solvent, so the distribution ratio P defined below is preferably 50. /。 /. 以上,更优选60%以上,进而优选70%以上。 Or more, more preferably 60% or more, further preferably 70%.

P=100X(o l-o2)/ol P = 100X (o l-o2) / ol

这里,ol是墨水Q的电导率,0 2是把墨水放在离心分离器中的上部澄清的部分的电导率。 Here, ol is the conductivity of the ink Q, the ink 02 is placed on an upper portion of the electrical conductivity of the centrifugal separator clarified. 电导率是使用LCR计(安藤电器(株)公司制造的AG-4311)和液体用电极(川口电机制作所(株)公司制造的LP-05 型),在施加电压5[V]、频率lkHz的条件下进行测定的值。 Conductivity is the use of an LCR meter (Ando Electric (strain) manufactured by AG-4311) and a liquid electrode (manufactured by Kawaguchi Electric (strain) Manufacturing Company LP-05 type), the applied voltage 5 [V], frequency of lkHz values ​​measured under the condition. 另夕卜,使用小型高速冷却离心机(富精工(株)公司制造的SRX-201),在转速14500rpm、 温度23'C的条件下进行了30分钟的离心分离。 Another Bu Xi, using small high-speed cooling centrifuge (Seiko rich (Ltd.) SRX-201 manufactured), were centrifuged at 14500 rpm for 30 minutes, the temperature of 23'C speed conditions.

通过使用以上的墨水Q,容易发生带电粒子的泳动,容易浓縮。 By using the above ink Q, prone charged particles migrate easily concentrated.

墨水Q的电导率优选为100〜3000pS/cm,更优选为150〜2500pS/cm, 进而优选为200〜2000 pS/cm。 The conductivity of the ink Q is preferably 100~3000pS / cm, more preferably 150~2500pS / cm, more preferably 200~2000 pS / cm. 通过采用以上的电导率的范围,喷出电极上施加的电压不变得极端高,不用担心相邻的喷出电极间的电导通。 By using the above range of conductivity, the discharge voltage applied to the upper electrode does not become extremely high, not worry about electric conduction between adjacent ejection electrodes.

另外,墨水Q的表面张力优选为15〜50mN/m的范围,更优选为15.5〜 45mN/m,进而优选为16〜40 mN/m的范围。 Further, the surface tension of the ink Q is preferably in the range 15~50mN / m, more preferably 15.5~ 45mN / m, more preferably the range of 16~40 mN / m. 通过使表面张力为该范围, 喷出电极上施加的电压不变得极端高,墨水不会扩散到头周围,污染。 When the surface tension is within this range, the voltage applied to the discharge electrode does not become extremely high, ink does not spread around the head contamination.

再有,优选墨水Q的粘度为0.5〜5mPa • sec,更优选为0.6〜3.0 mPa • sec,进而优选为0.7〜2.0 mPa • sec。 Further, preferably the viscosity of the ink Q 0.5~5mPa • sec, and more preferably 0.6~3.0 mPa • sec, more preferably 0.7~2.0 mPa • sec.

作为一例,把颜色材料粒子分散到载液中,粒子化,并且在分散剂中添加带电调整剂,使颜色材料粒子产生带电,从而能调制这样的墨水Q。 As an example, the color material particles are dispersed in the carrier liquid into particles, and adding the charging control agent in the dispersing agent, the color of the charged particle generating material, which can modulate such an ink Q. 作为具体的方法,说明以下的方法。 As a specific method, a method described below. ' '

(1)在预先混今颜色材料或分散樹脂粒子后,按照必要,使用分散剂,分散到载液中,加入带电调整剂的方法。 (1) After this premixed or color material dispersion resin particles, according to need, a dispersing agent, dispersed in the carrier liquid, a charging control agent is added to the method. (2) 在载液中同时添加颜色材料或分散树脂粒子以及分散剂,加入带电调整剂的方法。 (2) simultaneously adding color or material-dispersed resin particles and a dispersant in a carrier liquid, a charging control agent is added to the method.

(3) 同时在载液中添加颜色材料以及带电调整剂、或分散树脂粒子以及分散剂,分散的方法。 (3) simultaneous addition of the coloring material in the carrier liquid and charge control agent, or a dispersing resin particles and a dispersant, dispersion method.

图8 (A)表示利用实施本发明的喷墨头的控制方法的喷墨头的本发明的喷墨记录装置之一实施例的概念图。 One example of a conceptual diagram in FIG. 8 (A) represented by the control method of the present invention an ink jet head of the ink jet recording apparatus according to the present invention, the inkjet head.

图8 (A)所示的喷墨记录装置60 (以下称作打印机60)是在记录介质P上进行单面4色印刷的装置,具有记录介质P的输送部件、图像记录部件、溶剂回收部件,把它们收藏在框体61中。 FIG 8 (A) an ink jet recording apparatus 60 (hereinafter, referred to as printer 60) shown is one-sided four-color printing apparatus on the recording medium P, the conveying member having the recording medium P, image recording means, solvent recovery means , they are housed in the housing 61.

另外,输送部件具有供纸辊对62、导向器64、辊66 (66a、 66b、 66c)、 输送皮带68、输送皮带位置检测部件69、静电吸附部件70、除电部件72、 剥离部件74、定影*输送部件76和导向器78。 Further, the conveying member having a pair of feed rollers 62, guide 64, rollers 66 (66a, 66b, 66c), the conveyor belt 68, conveyor belt position detecting means 69, electrostatic attraction means 70, in addition to the electrical member 72, the peeling member 74, * The fixing member 76 and the conveyance guide 78. 图像记录形成部件具有头部件80、墨水循环系统82、头驱动器84、以及记录介质位置检测部件86。 Recording an image forming member having a head member 80, the ink circulation system 82, a head driver 84, and recording medium position detecting means 86. 溶剂回收部件具有排出扇90和溶剂回收装置92。 Solvent recovery member 90 having the discharge fan 92 and a solvent recovery device.

在记录介质P的输送部件中,供纸辊对62是与设置在框体61的侧面的搬入口61a相邻设置的输送辊对。 In the recording medium P conveying member, the paper feed roller pair 62 is conveyed to the input port 61a is disposed adjacent to the side surface of the casing 61 is provided a roller pair. 供纸辊对62把从未图示的储纸器供给的记录介质P送入输送皮带68(支撑在辊66a上的部分)。 The recording medium P on the paper feed roller 62 (not shown) supplied into the reservoir paper transport belt 68 (portion 66a is supported on the roll). 导向器64设置在供纸辊对62和支撑输送皮带68的辊66a之间,把记录介质P向输送皮带68引导。 Guide 64 provided on the paper feed roller pair 62 between the conveyor belt and the supporting roller 66a is 68, the recording medium P guided to the conveyor belt 68.

而且,在供纸辊对62的附近优选设置除去附着在记录介质P上的尘埃和纸粉等异物的异物除去部件。 Further, the paper feed roller disposed on the recording medium P adhered to the dust and the dust removing paper dust removing member of the foreign matter is preferably near 62.

作为异物除去部件,可,以组合使用基于吸引除去、吹飞除去、静电除去等非接触法、基于刷子、辊等的接触法的除去的1以上。 As the foreign matter removal member may, in a combination use based removed suction, blowing off and removing static electricity removing a non-contact method, a contact method above on the basis of removing brush, a roller or the like. 另外,使供纸辊对62为微黏着辊,再设置供纸辊对62的清洁器,在基于供纸辊对62 的记录介质P的供纸时进行尘埃和纸粉等异物的除去。 Further, the paper feed roller pair 62 is a micro adhesive roller, and then removing the pair of feed rollers disposed the cleaner 62 for dust and foreign matter in the paper dust on the paper feed roller when the sheet feeding of the recording medium P 62.

输送皮带68是架裤在'3个辊66上的环形皮带。 Conveying belt 68 is an endless belt carrier in the pants' three rollers 66. 另外,辊66a、 66b、 66c中的至少一个与未图示的驱动源连接着,使输送皮带68旋转。 Further, the roller 66a, 66b, 66c connected to the at least one drive source (not illustrated), rotation of the conveying belt 68.

输送皮带68在基于头部件80的图像记录时,除了记录介质P的扫掉输送部件,还作为保持记录介质P的压盘起作用,在图像的记录后,直到护送到定影'输送部件76为止。 The conveyor belt 68 at the image recording section 80 based on the head, in addition to sweep the recording medium P conveying member, the recording medium P is also a holding function of the platen, after recording an image, until the fixing escorted to 'the delivery member 76 until. 因此,.输送皮带68在尺寸稳定性上优异,优选由具有耐久性的材料形成,例如由金属、聚酰亚胺树脂、氟树脂、其他树脂和它们的复合体形成。 Thus, the conveying belt 68 excellent in dimensional stability, is preferably formed of a durable material such as a metal, a polyimide resin, a fluorine resin, other resins and their complex formation.

在图示例中,记录介质P通过静电吸附保持在输送皮带68上,所以 In the illustrated example, the recording medium P held on the conveyor belt 68 by electrostatic adsorption, so

输送皮带68中,保持记录介质P—侧(表面)具有绝缘性,与辊66接触的一侧(背面)具有导电性。 Conveyor belt 68, the recording medium is held P- side (surface) having insulating properties, with one side (back surface) of the contact roller 66 having conductivity. 另外,在图示例中,辊66a为导电性辊,输送皮带68的背面通过辊66a接地。 Further, in the illustrated example, the roller 66a is a conductive roller, the conveying belt 68 by the back roller 66a is grounded.

即输送皮带68保持记录介质P时,作为图1 (A)所示的电极陈底24a 和绝缘薄板24b构成的对置电极24起作用。 That is, when the conveyor belt 68 holds the recording medium P, as in FIG. 1 (A) of the counter electrode substrate 24a shown in Chen and 24b made of an insulating sheet 24 functions.

作为这样的输送皮带68,可以使用在金属皮带的表面一侧进行氟树脂涂敷的皮带,即在金属皮带上用所述任意的树脂材料涂敷的皮带、用粘合剂把树脂薄板和金属皮带粘在一起的皮带、在由所述树脂构成的皮带背面蒸镀金属的皮带、由各种方法制作的具有金属层和绝缘物层的皮带。 Such a conveyor belt 68, a belt may be used for coating fluororesin on the surface side of the metal belt, i.e. the belt of any material coated with a resin on a metal belt with an adhesive resin sheet and metal belts stick together, the back of the belt in the belt made of metal deposition of the resin, various methods of making a belt having a metal layer and the insulating layer.

另外,输送皮带68的与记录介质P接触的表面优选是平滑的,据此, 能取得记录介质P的良好的吸附性。 Further, the conveyor belt in contact with the surface of the recording medium P 68 preferably is smooth, accordingly, we can achieve good adsorption of the recording medium P.

输送皮带68优选通过公开的方法抑制摆动。 Swinging conveyor belt 68 is preferably suppressed by the disclosed method. 作为抑制摆动的方法, 列举了例如把辊66c作为张力辊,按照输送皮带位置检测部件69的输出即输送皮带68的宽度方向的检测位置,使辊66c的轴对于辊66a以及辊66b的轴倾斜,在输送皮带的宽度方向的两端改变张力,抑制摆动的方法。 As a method of suppressing swing, include for example the roll 66c as a tension roller, in accordance with the output conveyor belt position detecting means 69, i.e., feeding detection position in the width direction of the belt 68, the roller 66c of the shaft to the roller 66a and a roller 66b of the shaft inclination , widthwise ends of the transfer belt tension is changed, a method of suppressing the swing.

这里,输送皮带位置检测部件69如上所述,为了抑制输送皮带的摆动,并且把图像记录时的记录介质P的扫描输送方法的位置限制在给定位置,是检测输送皮带68的宽度方向的位置的部件,使用光传感器等公开的检测部件。 Here, conveyor belt position detecting means 69 described above, the conveyor belt in order to suppress the swing, and the position of the scanning method of transporting a recording medium P when an image recording is limited to a given position, the position detection of the conveying belt 68 in the width direction detecting means disclosed member using an optical sensor.

静电吸附部件70在记录介质P上施加对于头部件80 (本发明的喷墨头)的给定偏压,并且为了通过静电力吸附保持在输送皮带68上,使记录介质P带有给定的电位。 Electrostatic adsorption member 70 is applied to the head of a given biasing member 80 (the ink jet head of the present invention) on the recording medium P, and the adsorption by electrostatic forces to remain on the conveyor belt 68, the recording medium P with a given potential.

在图示例中,静电吸附部件70具有使记录介质P带电的高压带电器70a、连接在高压带电器70a上的负的高压电压70b。 In the illustrated example, the electrostatic attraction member 70 having the recording medium P charged in the high-pressure charger 70a, is connected to the high-voltage charger 70a of the negative high voltage 70b. 记录介质P通过供纸辊对62和输送皮带68输送,通过连接在负的高压电压70b上的高压带电器70a,带上负的偏压,并且静电吸附在输送皮带68的绝缘层上。 68 recording medium P conveyed by the paper feed roller pair 62 and the conveyor belt, is connected via a negative high voltage on the high-voltage charger 70b 70a, with a negative bias, and electrostatically attracted onto the conveyor belt 68 of the insulating layer.

而且,使记录介质P带电时的输送皮带.68的输送速度可以是能稳定带电的范围,可以与图像记录时输送速度相同,也可以不同。 Further, when the conveyor belt .68 charged recording medium P conveying speed may be charged stable range, may be the same transport speed of image recording may be different. 另外,通过使记录介质P旋转多次,能多次在同一记录介质P上作用静电吸附部件, 进行均匀带电。 Further, by rotating a plurality of times, many times the electrostatic adsorption member on the same recording medium P, for uniformly charging the recording medium P.

而且,在图示例中,用静电吸附部件70进行记录介质P的静电吸附和带电,但是可以分别设置静电吸附部件和带电部件。 Further, in the illustrated example, by electrostatic attraction and the charging member for electrostatically attracting the recording medium P 70, but may be provided a charging member and the electrostatic adsorption means, respectively.

静电吸附部件并不局限于图示例的高压带电器70a,还能利用电晕管带电器、固体充电器、放电针等各种部件和方法。 Electrostatic attraction means is not limited to the example of FIG high-voltage charger 70a, various components and methods corotron charger, a solid charger, the discharge needles and the like can use. 另外如后所述,辊66 的至少一个为导电性辊,或者在对记录介质P的记录位置,在输送皮带68 的背面一侧(与记录介质P相反一侧)配置导电性压盘,通过把该导电性辊或导电性压盘连接在负的高压电源上,构成静电吸附部件70,或者也可以采用使输送皮带68为绝缘性皮带,把导电性辊接地,把导电性压盘连接在负的高压电源上的结构。 Further, as described later, at least one roller 66 is a conductive roller, or the recording position of the recording medium P (side opposite to the recording medium P) conductive platen disposed in the back side of the conveyor belt 68 by the conductive roller or a conductive platen is connected to the negative high voltage power supply, an electrostatic suction member 70, or may be employed so that the conveyor belt 68 is an insulating belt, the conductive roller is grounded, the conductive platen is connected structure on the negative high voltage power supply.

由静电吸附部件70带电的记录介质P,通过输送皮带68输送到后面描述的头部件80的位置。 Charged recording medium P 70 by the electrostatic attraction means 68 to the transport position of the head member 80 by a later-described conveyor belt.

头部件80使用实施所述本发明的喷墨头控制方法的喷墨头,按照图像数据喷出墨滴,在记录介质P上记录图像。 The head member of the ink jet head 80 using the embodiment of the present invention is a control method of an inkjet head, ejecting ink droplets in accordance with image data, the image recorded on the recording medium P. 这里,如上所述,本发明的喷墨头使记录介质P的带电电位为偏压,通过在喷出电极18上施加驱动电压,在偏压上重叠驱动电压,喷出墨滴R,在记录介质P上记录图像是如上所述的。 Here, as described above, the ink jet head of the present invention that the charge potential of the recording medium P is biased by the drive voltage applied on the discharge electrode 18, the driving voltage superimposed on a bias, ejecting ink droplets R, the recording P is the image recording medium as described above. 这时,设置输送皮带68的加热部件,通过提高记录介质P 的温度,能促进记录介质P上的墨滴R的定影,能进一步抑制浸出,实现图像质量的提高。 In this case, a heating member disposed conveyor belt 68, by increasing the temperature of the recording medium P, to promote the fixing of the ink droplets R on the recording medium P, leaching can be further suppressed, the image quality is improved.

而且,后面描述基于头部件80的图像记录。 Further, based on a later-described image recording member 80 of the head.

记录图像的记录介质P由除电部件72除电,由剥离部件74从输送皮带68剥离,向定影和输送部件76输送。 Recording an image recording medium P by the electric charge removing member 72 in addition, a release member 74 peeled off from the conveyor belt 68, conveyed to the fixing member 76 and the delivery. ,

在图示例中,除电部件72是具有电晕管除电器72a、交流电源72b、 一端接地的直流高压电源72c的所谓的AC电晕管除电器。 In the illustrated example, in addition to having the electrical component 72 is a corotron eliminator 72a, the AC power supply 72b, a DC high voltage power source grounded at one end a so-called AC corotron 72c except appliances. 而且,除电部件除此之外,还能利用电晕管带电器、固体充电器、放电针等各种部件或方法,另外如上述的静电吸附部件70那样,也适合使用导电性辊和导电性压盘的构成。 Further, in addition to the electrical components in addition, but also by various components or methodologies corotron charger, a solid charger, the discharge needles and the like, as described in further electrostatic attraction member 70 that is also suitable for a conductive roller and the conductive the configuration of the platen.

作为剥离部件74,能利用剥离用刮板、反旋转辊、气刀等公幵的技术。 As the release member 74, can be peeled off by using a blade, a counter-rotating roller in the art well-Jian, air knife or the like. 从输送皮带68剥离的记录介质P输送到定影和输送部件76,把由喷墨头形成的图像定影。 From the conveyor belt 68 is peeled off the recording medium P is conveyed to the fixing member 76 and the conveyor, the fixed image formed by the ink jet head. 作为定影和输送部件76,使用由加热辊76a和输送辊76b构成的辊对, 一边夹持输送记录介质P, 一边把记录的图像加热定影。 76 as a fixing member and conveyed, using a roll pair composed of a heating roller 76a and conveying rollers 76b, while holding the recording medium P conveyance, while the recorded image heat fixing.

图像定影的记录介质P由导向器78引导,排出到未图示的排纸盒中。 The image fixing the recording medium P guided by the guide 78, is discharged to a discharge tray (not shown).

作为加热定影部件,除了上述的加热辊定影以外,还能列举基于红外线或卤素灯或氙灯的照射、或利用加热器的热风定影等一般的加热定影。 As the heating of the fixing member, in addition to the above-described heat roller fixing, a fixing can include hot air or infrared rays and the like based on a halogen lamp or a xenon lamp, or heating with a heater is generally fixed. 另外,在定影*输送部件76中,加热部件只进行加热,可以分别设置输送部件和加热定影部件。 Further, in the fixing member 76 in the conveying *, heating only the heating member, the heating member and the conveyor may be provided a fixing member, respectively.

而且,在加热定影时,作为记录介质P,使用涂层纸或多层纸时,由于急剧的温度上升,纸内部的水分急剧蒸发,有可能发生在纸表面产生凹凸的疱状现象。 Further, at the time of heat fixing, the recording medium P, when using a multilayer paper or coated paper, due to the rapid temperature rise, rapid evaporation of moisture within the paper, there may occur irregularities on the paper surface of blister-like phenomenon. 为了防止它,配置多个定影器,改变个各定影器的电力供给和到记录介质P的距离的一方或双方,从而记录介质P渐渐升温。 To prevent it, a plurality of fixing device, changing the power supplied to a fixing device and a respective one or both of the distance to the recording medium P, whereby the recording medium P gradually warming.

而且,在打印机60中,至少从基于头部件80的图像记录到结束基于定影•输送部件76的定影,对记录介质P的图像记录面不接触。 Further, in the printer 60, based on the end fixed by the fixing member 76 • transporting, at least not in contact with the recording head section 80 to the image based on the image recording surface of the recording medium P.

另外,并未特别限定定影•输送部件76的定影时的记录介质P的移动速度,可以是与图像形成时的基于输送皮带68的输送速度相同,也可以不同。 Further, not particularly limited movement speed of the recording medium P when the fixing member 76 fixing • delivery, may be based on the same conveying speed of the conveyor belt 68 when the image is formed, may be different. 在与图像形成时的输送速度不同时,在定影*输送部件76之前, 优选设置记录介质P的速度缓冲器。 Conveying speed when the image is not formed at the same time, before the fixing member 76 * conveyance, the recording medium P is preferably set speed buffer.

下面详细描述打印机60的图像记录。 The image recording printer 60 described in detail below.

如上所述,打印机60的图像记录部件具有:喷出墨水的头部件80; 对头部件80进行墨水Q的供给和回收的墨水循环系统82;未图示的计算机、通过来自RIP (Raster Image Processor)等外部设备的输出描画信号驱动头部件80的头驱动器84;为了决定记录介质P的图像记录位置、检测记录介质P的记录介质位置检测部件86。 As described above, the image recording section 60 has the printer: an ink ejection head member 80; Q head member 80 of the ink supply and recovery of the ink circulation system 82; a computer (not shown), by from RIP (Raster Image Processor ) equal output signal for driving the drawing head member external device driver 80 of the head 84; in order to determine an image recording position of the recording medium P, the recording medium position detecting means 86 detects the recording medium P.

图8 (B)是模式地表示头部件80、其周围的记录介质P的输送部件的立体图。 FIG. 8 (B) is a schematic showing the head member 80, a perspective view of a transport member of the recording medium P around it.

头部件80与进行彩色图像的记录的蓝绿色(C)、洋红(M)、黄(Y)、 黑(K)等4色的墨水喷出对应,具有4个喷墨头80a,按照来自供给图像数据的头驱动器84的信号,把由墨水循环系统82供给的墨水Q作为墨滴R喷出,在通过输送皮带68以给定速度输送的记录介质P记录图像。 The head member 80 and the cyan (C) recording a color image, magenta (M), yellow (Y), black (K) and the like corresponding to four colors of ink ejection, having four inkjet heads 80a, follow from signal supplied to the image data of the head driver 84, the Q ejecting ink supplied by the ink circulation system 82 as the ink droplets R, the recording medium P to record an image by the conveying belt 68 is conveyed at a given speed.

各色的喷墨头80a排列在输送皮带68的输送方向上。 Color ink jet head 80a are arranged in the conveying direction of the conveyor belt 68.

而且,头部件80的各色的喷墨头80a是按照本发明的喷墨头。 Further, the head member 80a 80 color ink jet head is an ink jet head according to the invention. 在图示例中,喷墨头80a是把喷出口28排列在记录介质P的宽度方 In the illustrated example, the inkjet head 80a is arranged in the discharge port 28 in the width direction of the recording medium P

向全部区域中的行头,优选如图2所示,是具有彼此交错配置的多个喷嘴 The entire region in the first line, preferably 2, having a plurality of nozzles arranged staggered to each other

列的多通道头。 Multi-channel head of the column.

因此,在图示例中,在输送皮带68上保持记录介质P的状态下,通过输送使记录介质P对于头部件80通过1次,即只进行1次的扫描输送, 在记录介质P的全面形成图像。 Thus, in the illustrated example, the state holding the recording medium P on the conveyor belt 68, conveyed by the recording medium P to the head 80 by a single member, i.e. only once scanning conveyance, the recording medium P round an image is formed. 因此,与把喷出头串行扫描时相比,高速的图像记录(描画)成为可能。 Thus, compared to when the serial discharge head scanning high-speed image recording (drawing) becomes possible.

而且,本发明的喷墨头在所谓的串行头(往返类型)中利用,因此, 打印机60可以是该形态。 Further, the ink jet head of the invention in a so-called serial head (shuttle type) utilized, and therefore, the printer 60 may be of the form.

这时,使各喷墨头的喷出口28的列(可以是单列,也可以是多通道) 与输送皮带68的输送方向一致,构成头部件80,设置在与记录介质P的输送方向正交的方向扫描头部件80的扫描部件。 In this case the discharge outlet of each column of the ink jet head (which may be separate, or may be multi-channel) 28 coincides with the conveying direction of the conveyor belt 68, constituting the head member 80, disposed in the conveying direction of the recording medium P n post scanning direction of the scanning head member 80. the member. 作为扫描部件,能使用已经知道的扫描部件。 As the scanning means can be used already known scanning means.

图像记录可以与通常的往返类型的喷墨打印机同样进行,按照喷出口28的列的长度,通过输送皮带68间歇地输送记录介质P,与该间歇输送同步,在停止时扫描头部件80,在记录介质P的全面记录图像。 The image recording can be performed with the same conventional shuttle type ink jet printer, ejection port row 28 in accordance with the length of the conveying belt 68 by conveying the recording medium P is intermittently conveying synchronization with the intermittent member when the scanning head 80 is stopped, a comprehensive record of the image recording medium P.

这样,由头部件SO在记录介质P的全面形成的图像如上所述,记录介质P通过由定影•输送部件76夹持输送,由定影• 1输送部件76定影。 In this way, the head element described above, the image formed in the round SO recording medium P, the recording medium P is conveyed through the nip by the fixing member 76 • conveying member 76 fixed by the fixing • 1 delivery.

头驱动器84从外部装置取得图像数据,从进行各种处理的系统控制部(未图示)取得图像数据,根据该图像数据驱动头部件80。 The head driver 84 to obtain image data from an external device, image data acquired from the system control unit (not shown) of various processes, the head drive means 80 based on the image data.

该系统控制部是对从计算机、RIP、图像扫描仪、磁盘装置、图像数据传送装置等外部装置取得的图像数据进行色分解、到适当的像素数或灰度数的分割演算,头驱动器84驱动头部件80-(喷墨头)的图像数据的部位。 The system control unit is image data acquired from an external device of a computer, RIP, an image scanner, a magnetic disk device, an image data transfer means like color separation, to the appropriate division calculating the number or the number of pixel grayscale, the head driver 84 drives parts of the head member 80 (ink jet head) of the image data. 另外,系统控制部进行与基于输送皮带68的记录介质P的输送定时匹配的基于头部件80的墨水喷出定时的控制。 Further, the system control unit for controlling the discharge timing based on the recording medium P conveying timing of the conveyor belt 68 based on the matching of the head member 80 of the ink. 利用来自记录介质位置检测部件86的输出、来自对输送皮带68或输送皮带68的驱动部件配置的编码器的输出信号,进行喷出定时的控制。 Using the output from the recording medium position detecting means 86, on the conveyor belt 68 from the conveyor encoder output signals or drive belt member 68 arranged, for controlling the discharge timing. 而且,记录介质位置检测部件86是用于检测输送到基于头部件SO的 Further, the recording medium position detecting means 86 for detecting the conveying member on the head of SO

墨滴的喷出位置的记录介质p的,能使用光传感器等已知的检测部件。 P of the recording medium discharge position of ink droplets, using known detection means can be an optical sensor.

这里,头驱动器84当应用行头等时,控制的喷出部的数为多个时(通道数),分割描画,使用公开的电阻矩阵型驱动法或电阻二极管矩阵型驱动法。 Here, when the application head driver 84 top row, the number of ejection control portion is two or more (channels) divided drawing, using the disclosed resistive matrix drive method or resistance diode matrix type drive method. 据此,能减少头驱动器S4的使用IC数,能减少成本,抑制控制电路尺寸。 Accordingly, the head drive can be reduced using an IC number S4, the cost can be reduced, the circuit size suppression control.

墨水循环系统82用于使墨水Q流向头部件80的各色喷墨头80a的墨水流道30 (参照图1 (A)),包含:具有4色(C、 M、 Y、 K)等各色的墨水容器、泵和补给用墨水容器(未图示)的墨水循环装置82a;从墨水循环装置82a的墨水容器向头部件80的各色喷墨头的墨水流道30供给各色墨水Q的墨水供给系统82b;从头部件80的各色喷墨头的墨水流道30 向墨水循环装置82a回收墨水的墨水回收系统82c。 Ink flow passage 30 ink circulation system 82 for color ink Q flowing to the head member of the ink jet head 80a 80 (see FIG. 1 (A)), comprising: a four-color (C, M, Y, K) colors, etc. an ink container, an ink supply container and a pump (not shown) of the ink circulation device 82a; Q color inks supplied from the ink container of the ink circulation device 82a to the ink flow paths of each color ink jet head 30 of the head member 80 82b supply system; the head member 80 of the ink jet head of each color ink to the ink flow path 30 of the ink circulation device 82a recovering an ink recovery system 82c.

墨水循环系统82如果通过水循环装置82a从墨水容器通过墨水供给系统80b向头部件SO按各色供给墨水Q,并且通过墨水供给系统S0c从头部件80按各色把墨水Q能回收到墨水容器中,就可以任意的。 If the ink circulation system 82 from the ink container through the ink supply system 80b to the SO header for each color component of the ink Q is supplied through the water circulation apparatus 82a, and the head through the ink supply system member S0c 80 for each color to the ink Q in the ink container can be recovered, it It can be arbitrary.

墨水容器贮存着各色墨水Q,用泵吸出墨水Q,向头部件80输送。 Color ink container storing the ink Q, the ink is pumped out by Q, the conveying member 80 to the head. 通过从头部件80喷出墨水,用墨水循环系统82循环的墨水的浓度下降, 所以在墨水循环系统82中,通过墨水浓度检测器检测墨水浓度,按照它, 从补给用墨水容器适当补充墨水,把墨水浓度保证在给定的范围中。 The head member 80 by ejecting ink drops 82 concentration in the circulating system is circulated with the ink in the ink, the ink circulation system 82, an ink by an ink concentration detector detecting a concentration, according to which, from the replenishment ink appropriate to add the ink container, the ensure that the concentration of ink in a given range.

另外,在墨水容器中优选设置用于抑制墨水的固体成分的沉淀和浓縮的搅拌装置、用于抑制墨水的温度变化的墨水温度管理装置。 Further, in the ink container is preferably provided for suppressing precipitation of the solid and concentration of the ink stirring means, temperature control device for suppressing ink temperature change in the ink. 其理由是如果不进行温度管理,则由于环境温度的变化,墨水温度变化,墨水的物理特性变化,从而点直径变化,有可能无法稳定地形成高图像质量的图像。 This is because if the temperature control is not performed, since the change in ambient temperature, the ink temperature changes, changes in physical properties of the ink, so that the spot diameter changes, it may not be stably formed images of high image quality.

作为搅拌装置,能使用旋转叶片、超声波振子、循环泵等。 The stirring means can be used rotating blades, ultrasonic transducers, circulation pumps and the like.

作为墨水的温度控制装置,能使用在头部件80、墨水容器、墨水配管等系统中配置加热器或调温元件等发热元件或冷却元件,通过温度传感器例如恒温器控制的方法等公开的方法。 As the ink temperature control means, a heater can be used in the first member 80, the ink container, ink piping system, the temperature control element or the like heating element or a cooling element, by the temperature sensor, for example, a method disclosed in a method of control of a thermostat . 另外,用于把容器内的浓度分布保持一定的搅拌装置可以作为用于控制墨水的固体成分的沉淀和浓縮的搅拌装置公用。 Further, for the distribution of concentration in the vessel can be kept constant as a precipitate stirring means for controlling the solid content of the ink and stirring means common concentrated.

如上所述,打印机60具有由排出扇90和溶剂回收装置92构成的溶 As described above, the printer 60 having a solution composed of solvent recovery and the exhaust fan 90 92

44剂回收部件。 Recovery member 44. 溶剂回收部件回收从头部件80向记录介质P上喷出的从墨滴蒸发的载液,特别是在把由墨滴形成的图像定影时从记录介质P蒸发的载液。 Solvent recovery member 80 to the carrier liquid evaporated from the ink droplets ejected onto the recording medium P, in particular in the carrier liquid when the image is fixed is formed by the ink droplets from the recording medium P evaporated head member.

排出扇90用于吸入打印机60的框体61内部的空气,向溶剂回收装置92输送。 Fan 90 for discharging the air sucked inside the case 61 of the printer 60, fed to the solvent recovery device 92.

溶剂回收装置92具有溶剂蒸气吸收材料,把包含由排出扇90吸入的溶剂蒸气的气体的溶剂成分吸附到溶剂蒸气吸收材料上,把溶剂吸附回收后的气体排出到打印机60的框体61夕卜。 The solvent recovery device 92 has a solvent vapor absorbent material, the gas containing the solvent component of the solvent vapor sucked by the discharge fan 90 the solvent vapors are adsorbed on the absorbent material, the exhaust gas after recovering the solvent adsorbed to the frame 61 of the printer 60 Xi Bu . 作为溶剂蒸气吸收材料,适宜使用各种活性炭。 As a solvent vapor absorbent material, suitably using various activated carbon.

在上面的叙述中,说明了使用C、 M、 Y、 K等4色墨水记录彩色图像的静电式的喷墨记录装置,但是本发明并不局限于此,可以是黑白用的记录装置,也可以是使用任意数的淡色或特色的墨水来记录的装置。 In the above description, the described electrostatic ink jet recording apparatus uses C, M, Y, K, four-color ink recording a color image, but the present invention is not limited thereto, and may be a monochrome recording apparatus, but also It may be a device using any number of features or pale ink to the recording. 这时, 使用与墨水颜色数对应的数量的头部件80和墨水循环系统82。 In this case, the number of ink colors using a corresponding number of head member 80 and the ink circulation system 82.

另外,在以上的例子中,说明了均使墨水中的颜色材料粒子带正电, 使记录介质或记录介质P的背面的对置电极为负的高电压,喷出墨滴R的喷墨头,但是本发明并不局限于此,相反,也可以使墨水中的颜色材料粒子带负电,使记录介质或对置电极为正的高电压,进行基于喷墨头的图像记录。 Further, in the above described example, the color of the material particles are positively charged ink, the back surface of the opposing electrode or the recording medium, the recording medium P to a negative high voltage, the ink jet head ejecting ink droplets of R However, the present invention is not limited thereto, but may be the color of the ink material particles are negatively charged, the recording medium or the counter electrode as a positive high voltage, based on image recording ink jet head. 这样,当着色带电粒子的极性与所述之例相反时,只要使向静电吸附部件、对置电极、喷墨头的驱动电极的施加电压极性等与所述例子相反即可。 Thus, the polarity of the presence of charged particles of the ink ribbon of Example Conversely, so long as the electrostatic attraction means, the counter electrode, the driving electrode ink jet head applied voltage polarity opposite to the Examples.

以上详细说明了本发明的喷墨头、喷墨头的控制方法和喷墨记录装置,但是本发明并不局限于此,在不脱离本发明的要旨的范围中,当然可以进行各种改良和变更。 An ink jet head described above in detail the present invention, a control method of the ink jet head and an ink jet recording apparatus, but the present invention is not limited thereto, without departing from the scope of the gist of the present invention, of course, that various modifications and change.

Claims (16)

  1. 1. 一种喷墨头的控制方法,通过静电力使墨滴喷出,其中:所述喷墨头具有:形成喷出所述墨滴的多个喷出口的喷出口基板;与所述喷出口基板的所述多个喷出口分别对应形成,用于在所述多个喷出口上生成静电场的喷出电极;为了遮挡从相邻的所述喷出电极产生的电场,在相邻的所述喷出口之间,在比所述喷出电极更靠墨水喷出一侧的位置上,以与所述喷出电极绝缘的状态下在所述喷出口基板上形成、并公共地控制的保护电极;在所述喷出电极上按照描画信号施加驱动电压,同时在所述保护电极上施加具有与施加在所述喷出电极上的驱动电压相同的频率、而且交替重复第一电压和比该第一电压更低电压的第二电压的交流偏压。 1. A method of controlling an ink jet head, ink droplets are discharged by electrostatic force, wherein: the inkjet head having: a plurality of ejection outlets eject the ink droplets ejection port forming substrate; the spray the outlet of discharge ports corresponding to the plurality of substrate are formed, the discharge electrode for generating an electrostatic field in said plurality of ejection outlet; in order to block an electric field generated from the discharge electrode adjacent the, adjacent between the discharge outlet, the discharge electrode than the ink ejection position closer to the upper side, to a state of the ejection electrode insulated from said discharge port is formed on the substrate, and the common control guard electrode; applying a driving voltage on the discharge electrode in accordance with the drawing signal, while applying the protective upper electrode has the same drive voltage is applied on the electrodes of the discharge frequency, and alternately repeating a first voltage and the ratio a second AC bias voltage of the first voltage lower voltage.
  2. 2. 根据权利要求1所述的喷墨头的控制方法,其中: 所述第一电压是正电压,所述第二电压是负电压。 The control method of the ink jet head as claimed in claim 1, wherein: said first voltage is a positive voltage, the second voltage is a negative voltage.
  3. 3. 根据权利要求l所述的喷墨头的控制方法,其中:施加所述交流偏压,以使对于在记录介质上形成1点时的所述驱动电压的信号成为反相。 The control method of the ink jet head as claimed in claim l, wherein: said alternating current bias is applied, so that the signal to point 1 is formed on the recording medium drive voltage becomes inverted.
  4. 4. 根据权利要求1所述的喷墨头的控制方法,其中: 施加所述交流偏压,以使对于在记录介质上形成1点时的所述驱动电压的信号,相位以及脉冲宽度的至少一方不同。 The control method of an ink jet head according to claim 1, wherein: said alternating current bias is applied, so that for the point when a recording medium is formed on the driving voltage signal, a phase and a pulse width of at least different party.
  5. 5. 根据权利要求4所述的喷墨头的控制方法,其中: 控制所述交流偏压的相位和脉冲宽度的至少一方,以使在所述喷出电极上施加所述驱动电压之前将所述交流偏压切换为所述第二电压。 The control method of the ink jet head as claimed in claim, wherein: said controlling at least one of a width and pulse phase alternating current bias, so that prior to applying the driving The voltage across the discharge electrode said switching to the second AC bias voltage.
  6. 6. 根据权利要求4所述的喷墨头的控制方法,其中: 控制所述交流偏压的相位和脉冲宽度的至少一方,以使在向所述喷出电极的所述驱动电压的施加结束前将所述交流偏压切换为所述第一电压。 The control method of the ink jet head as claimed in claim, wherein: said controlling at least one of a width and pulse phase alternating current bias, so that the driving voltage is applied to the end of the discharge electrode before the handover to the first AC bias voltage.
  7. 7. 根据权利要求l所述的喷墨头的控制方法,其中: 所述墨水是把至少包含颜色材料的带电的微粒分散到绝缘性的分散介质中而构成的墨水。 The control method of the ink jet head as claimed in claim l, wherein: said ink is the ink containing at least an insulating dispersion medium and charged particles constituting the coloring material is dispersed.
  8. 8. —种喷墨头,利用静电力使包含带电的微粒的墨水喷出,在记录介质上记录图像,包括:形成了喷出所述墨水之液滴的多个喷出口的喷出口基板;与所述喷出口基板的所述多个喷出口分别对应形成,并在各自的喷出口上生成电场的喷出电极;为了遮挡从相邻的所述喷出电极产生的电场,在相邻的所述喷出口之间,在比所述喷出电极更靠墨水喷出一侧的位置上,在与所述喷出电极绝缘的状态下形成在所述喷出口基板上的保护电极;和连接在所述保护电极上,并用于将具有与施加在所述喷出电极上的驱动电压相同的频率、且交替重复第一电压和第二电压的交流偏压,对所述保护电极上一边控制一边施加的保护电极控制部。 8. - kind of the ink jet head using electrostatic force to the ink containing charged fine particles ejected to record an image on a recording medium, comprising: a substrate forming a plurality of ejection ports ejecting the ink droplets of the ejection outlet; and the ejection orifice substrate is formed a plurality of ejection ports respectively, and generates an electric field discharge in the respective discharge port; an electric field in order to block the discharge from the adjacent electrode produced in the adjacent between the discharge outlet, the discharge electrode at a position closer than the ink discharge side, the protective electrode is formed on a substrate, said discharge outlet is in a state insulated from the discharge electrode; and a connection on the guard electrode, and for having applied to said control electrode protection while at the same driving frequency of the voltage on the discharge electrode, and alternately repeating a first voltage and a second AC bias voltage, protective electrode while applying the control unit.
  9. 9. 根据权利要求8所述的喷墨头,其中: 所述第一电压是正电压,所述第二电压是负电压。 9. The ink jet head according to claim 8, wherein: said first voltage is a positive voltage, the second voltage is a negative voltage.
  10. 10. 根据权利要求8所述的喷墨头,其中:施加所述交流偏压,以使所述保护电极控制部对于在所述记录介质上形成1点时的所述驱动电压的信号成为反相。 10. The ink jet head according to claim 8, wherein: said alternating current bias is applied to the control electrode protection signal forming section 1 point when the driving voltage of the recording medium to be trans phase.
  11. 11. 根据权利要求8所述的喷墨头,其中:施加所述交流偏压,以使所述保护电极控制部对于在所述记录介质上形成1点时的所述驱动电压的信号,相位以及脉冲宽度的至少一方不同。 11. The ink jet head according to claim 8, wherein: said alternating current bias is applied to the control electrode protection signal forming section 1 point when the driving voltage to the recording medium, the phase and at least one different pulse widths.
  12. 12. 根据权利要求ll所述的喷墨头,其中:所述保护电极控制部控制所述交流偏压的相位和脉冲宽度的至少一方,以使在所述喷出电极上施加所述驱动电压之前将所述交流偏压切换为所述第二电压。 The driving voltage of the guard electrode control portion controls at least one of said bias phase alternating current and pulse width so that the electrode is applied to the discharge: an ink jet head as claimed in claim ll, wherein prior to the handover to the second AC bias voltage.
  13. 13. 根据权利要求12所述的喷墨头,其中:所述保护电极控制部控制所述交流偏压的相位和脉冲宽度的至少一方,以使在向所述喷出电极的所述驱动电压的施加结束前将所述交流偏压切换为所述第一电压。 13. The ink jet head according to claim 12, wherein: said control electrode protection unit controls at least one of said alternating bias voltage phase and pulse width, so that the drive voltage to the discharge electrode before the end of application of the AC bias voltage is switched to the first.
  14. 14. 根据权利要求8所述的喷墨头,其中:所述墨水是把至少包含颜色材料的带电的微粒分散到绝缘性的分散介质中而构成的墨水。 14. The ink jet head according to claim 8, wherein: said ink is at least charged particles containing the color material dispersed in an insulating ink dispersion medium constituted.
  15. 15. —种喷墨记录装置,具备喷墨头和移动部件,其中: 所述喷墨头利用静电力使包含带电微粒的墨滴喷出,在记录介质上记录图像,该喷墨头具有:形成了喷出所述墨滴的多个喷出口的喷出口基板; 与所述喷出口基板的所述多个喷出口分别对应形成,并用于在各自的喷出口上生成电场的喷出电极;为了遮挡从相邻的所述喷出电极产生的电场, 在相邻的所述喷出口之间,在比所述喷出电极更靠墨水喷出一侧的位置, 在与所述喷出电极绝缘的状态下形成在所述喷出口基板上、并公共控制的保护电极;连接在所述保护电极上,并且将具有与施加在所述喷出电极上的驱动电压相同的频率、而且交替重复第一电压和比该第一电压低的第二电压的交流偏压,对所述保护电极上一边控制一边施加的保护电极控制部; '所述移动部件用于使所述喷墨头和所述记录 15. - kind of the ink jet recording apparatus comprising an ink jet head and a movable member, wherein: the inkjet head using electrostatic force to the ink droplets containing charged particles is ejected to record an image on a recording medium, the ink jet head having: forming a plurality of ejection of the ink droplets ejection outlet of the ejection port substrate; the substrate with the discharge port respectively formed in the plurality of discharge ports, and discharge electrodes for generating an electric field in the respective ejection outlet; in order to shield an electric field generated from the discharge electrode adjacent the, in between the adjacent ejection outlet than a position closer to the discharge electrodes in the discharge side of the ink in the ejection electrode on the discharge port substrate, and a protective electrode common control state of forming a lower insulating; connected to the protective electrode, and having a drive voltage applied to the discharge electrode at the same frequency, and are alternately repeated a first voltage lower than the first voltage and the second AC bias voltage, while controlling the protection guard electrode control portion applied to the side electrode; 'said moving member for causing said ink-jet head and the said recording 介质相对移动。 Medium relatively.
  16. 16. 根据权利要求15所述的喷墨记录装置,其中: 所述第一电压是正电压,所述第二电压是负电压。 16. The ink jet recording apparatus according to claim 15, wherein: said first voltage is a positive voltage, the second voltage is a negative voltage.
CN 200510099996 2004-09-14 2005-09-13 Ink jet head, control method therefor, and ink jet recording apparatus CN100496981C (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0899106A2 (en) 1997-08-27 1999-03-03 NEC Corporation Electrostatic ink jet recording device
US6158844A (en) 1996-09-13 2000-12-12 Kabushiki Kaisha Toshiba Ink-jet recording system using electrostatic force to expel ink
CN1394747A (en) 2001-06-26 2003-02-05 兄弟工业株式会社 Ink-jet head preventing adjacent nozzle misspraying ink
CN1470381A (en) 2002-06-28 2004-01-28 富士胶片株式会社 Ink-jet recording device and recording method

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6158844A (en) 1996-09-13 2000-12-12 Kabushiki Kaisha Toshiba Ink-jet recording system using electrostatic force to expel ink
EP0899106A2 (en) 1997-08-27 1999-03-03 NEC Corporation Electrostatic ink jet recording device
CN1394747A (en) 2001-06-26 2003-02-05 兄弟工业株式会社 Ink-jet head preventing adjacent nozzle misspraying ink
CN1470381A (en) 2002-06-28 2004-01-28 富士胶片株式会社 Ink-jet recording device and recording method

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