CN101622133A - 从喷墨打印机喷射滴尺寸可变的滴 - Google Patents

从喷墨打印机喷射滴尺寸可变的滴 Download PDF

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CN101622133A
CN101622133A CN200880006806A CN200880006806A CN101622133A CN 101622133 A CN101622133 A CN 101622133A CN 200880006806 A CN200880006806 A CN 200880006806A CN 200880006806 A CN200880006806 A CN 200880006806A CN 101622133 A CN101622133 A CN 101622133A
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威廉·莱滕德里
罗伯特·哈森贝因
迪恩·A·加德纳
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Abstract

一种使墨从喷墨打印机的墨室喷出的方法，包括：使第一团墨从墨室排出；并且在经过选定间隔后，使第二团墨从墨室排出。所述间隔选定为大于所述室的基本共振频率的倒数，并且选定为使所述第一团在所述第二团被排出时与所述墨室中的墨保持接触。

Description

从喷墨打印机喷射滴尺寸可变的滴
技术领域
本发明涉及喷墨打印机，具体说，涉及能够喷射滴尺寸可变的滴的喷墨打印机。
背景技术
在压电喷墨打印机中，打印头包括多个墨室，各墨室与喷孔和墨贮存器流体连通。墨室的至少一个壁与压电材料接合。当被致动时，该压电材料发生变形。该变形导致壁的变形，进而产生压力波，该压力波在从墨贮存器汲取出另外的墨的同时，最终将墨推出喷孔外。
为了在打印图像上提供更大的密度变化，通常有利的是从墨室喷射尺寸不同的墨微滴。这样做的一种方法是依次致动压电材料。对压电材料的每次致动会泵送一团墨到喷孔外。如果以高于墨室的共振频率的频率进行致动，则在第一团开始飞向基材前，后续团将到达喷孔板。因此，所有团合并在一起而形成一个微滴。这个微滴的尺寸取决于该微滴从喷孔飞向基材前发生的致动次数。2004年3月15日提交的共同待审申请10/800467中公开了这种喷墨打印机，其内容通过引用并入本文。
发明内容
一方面，本发明涉及一种使墨从喷墨打印机的墨室喷出的方法。这种方法包括：使第一团墨从墨室排出；并且在经过选定间隔后，使第二团墨从墨室排出。所述间隔选定为大于所述室的基本共振频率的倒数，并且选定为使所述第一团在所述第二团被排出时与所述墨室中的墨保持接触。
一些实施例包括：使第二团喷出包括向所述第二团施加大于第一团的速度的速度。
其它实施例包括：在经过选定间隔后，使第三团墨从墨室排出。在部分这些实施例中，使第三团墨排出包括向所述第三团施加大于所述第二团的速度的速度。在这些实施例中，有些还包括：使所述第一团、第二团和第三团具有相应的第一动量、第二动量和第三动量，所述第一动量、第二动量和第三动量选定为使包含所述第一团、第二团和第三团的墨滴的滴寿命等于由两团墨形成的墨滴的滴寿命。
其它实施例包括这样的实施例，其中：将所述间隔选定为约15微秒到16微秒之间。
还有其它实施例包括：使所述第一团和第二团具有第一动量和第二动量，所述第一动量和第二动量选定为使包含所述第一团和第二团的墨滴的滴寿命等于由单团墨形成的墨滴的滴寿命。
另外的实施例包括这样的实施例，其中：使第一团墨和第二团墨排出包括从预定的喷射脉冲模板(palette)中选择喷射脉冲的组合。
另一方面，本发明还涉及一种使墨从喷墨打印机头的墨室喷出的方法。这种方法包括：确定生成具有选定滴尺寸的墨滴所需的墨团的第一数量；排出墨以形成长度随时间而增加的自由表面流体引导部，所述自由表面流体引导部在所述墨室中的墨与移动远离喷孔的领先墨团之间延伸；以及使一组跟随墨团沿所述自由表面流体引导部朝所述领先团前进。这组跟随团中的团的数量比所述第一数量少一个。这些团被大于所述墨室的基本共振频率的倒数的间隔暂时分开。
在一些实施例中，使一组跟随墨团沿自由表面流体引导部前进的步骤包括使所述跟随团以大于领先团的速度的速度前进。
本发明的其它方面包括一种机器可读介质(machine-readable media)，在该介质上编码有使任意上述方法得以执行的软件。
另一方面，本发明涉及用于喷墨打印机的压电打印头。这种打印头包括：限定出墨室的壁；与所述墨室机械连通的压电致动器；和用于控制所述压电致动器的控制器。所述控制器配置成使所述压电致动器完成以下动作：使第一团墨从所述墨室排出，并且在经过选定间隔后，使第二团墨从所述墨室排出。所述间隔选定为大于所述室的基本共振频率的倒数。另外，所述间隔选定为使所述第一团在所述第二团被排出时，与所述墨室中的墨保持接触。
除非另有说明，否则本文所使用的全部技术和科学术语的意思与本发明所属领域的技术人员通常了解的相同。下面将描述适当的方法和材料，但在本发明的实施和测试中也可使用与本文所述方法和材料相似或相等的方法和材料。本文所提及的所有出版物、专利申请、专利和其它参考文献通过引用而整体并入本文。在有冲突的情况下，将以本说明书(包括定义)为准。另外，所述材料、方法和实例只起示例作用，并非旨在用于限制。
本发明的其它特征和优点将在以下详细描述以及权利要求书中变得清楚明了。
附图说明
图1示出来自喷墨打印头的墨室；
图2示出喷射脉冲；
图3示出具有三个喷射脉冲的模板；
图4示出前往基材途中的独立墨微滴；
图5示出前往基材途中的单个大墨滴；
图6示出结合而形成墨滴的墨团；
图7示出由图3的激励波形生成的墨团；
图8示出滴寿命和脉冲延迟期。
具体实施方式
图1示出墨室10，该墨室10与喷墨打印机的压电打印头中的多个喷墨器之一相关联。墨室10具有与压电材料接合的主动壁(active wall)12，所述压电材料连接至受控制器16控制的电源14。位于墨室10的一端的通道18提供与墨贮存器20的流体连通，该墨贮存器20被打印头的多个其它墨室(未示出)共享。在墨室10的另一端，由喷孔板24形成的喷孔22实现与墨室10外部的空气的流体连通。
操作中，控制器16接收指示待喷出的滴的尺寸的指令。基于所需的尺寸，控制器16向主动壁12施加激励波形(excitation waveform)。
该激励波形包括从预定喷射脉冲的模板中选择一个或多个喷射脉冲。每个喷射脉冲经由喷孔22排出墨团。从模板中选出的且组成特定激励波形的喷射脉冲的数量取决于所需滴的尺寸。总之，需求的滴(drop)越大，所需用来形成滴的团(bolus)的数量就越多，因此激励波形将包含更多的喷射脉冲。
图2示出来自一喷射脉冲模板的一个这种预定的喷射脉冲。该喷射脉冲以汲取相位(draw phase)开始，其中压电材料发生变形以使墨室10的体积扩大。这使得墨被从贮存器20中汲取出来，并进入墨室10中。
在汲取相位期间发生的变形产生第一压力波，该第一压力波源于扰动源，即主动壁12。该第一压力波沿两个方向远离其源头前进，直到到达该第一压力波发生声音阻抗变化的位置。在该位置，第一压力波中的至少一部分能量被反射回源头。
在经过汲取时间td后，开始等待相位(waiting phase)。等待相位的持续时间，称为“等待时间tw”，被选择为允许上述压力波从源头向外传播、在阻抗骤变点发生反射、并返回起点。因此，该持续时间取决于墨室10内的波传播速度以及波源与阻抗骤变点之间的距离。
在等待相位后，控制器16开始喷射相位(ejection phase)，该喷射相位的持续时间由喷射时间te限定。在喷射相位，压电材料发生变形，以使墨室10恢复为原始体积。这引发第二压力波。通过正确地设置等待相位的持续时间，可将第一压力波和第二压力波设置成同相位，从而使其相长地(constructively)叠加。因此，组合的第一和第二压力波协同经由喷孔22排出墨团。
汲取相位期间压电材料发生的变形程度调控与由喷射脉冲形成的团相关联的动量(momentum)。
图3示出具有三个喷射脉冲的喷射脉冲模板。在所有属性中，各个喷射脉冲的特征是脉冲振幅和脉冲延迟期。脉冲振幅控制由喷射脉冲形成的团的动量。喷射脉冲的脉冲延迟期是基准时间与特定事件之间的时间间隔，该特定事件与该喷射脉冲相关联。基准时间优选为打印机控制电路发送触发脉冲的时间。该时间可被视为激励波形的开始时间。用于标明脉冲延迟期的另一端点的事件优选为喷射脉冲的开始时间。
图3也可看作是使用在激励模板中可用的全部三个喷射脉冲的激励波形。其它激励波形可包括这三个可用喷射脉冲的子组。例如，两团式墨滴可由只具有第一和第三喷射脉冲、只具有第一和第二喷射脉冲或只具有第二和第三喷射脉冲的激励波形形成。一团式墨滴可由只具有三个可用喷射脉冲中的一个喷射脉冲的激励波形形成。
在第一操作模式中，连续脉冲之间的间隔相对较长。当以这种方式操作时，由第一脉冲排出的团开始从喷孔板24飞行至基材，然后排出第二团。因此，该第一操作模式生成一系列独立的微滴，这些微滴如图4所示那样飞向基材。这些微滴在飞行中或在基材上彼此结合，以形成更大的滴。
图4所示的与微滴连接的长尾状物在飞行期间破碎成伴随体(satellite)。于是，这些尾状物可以以非受控方式降落在基材上。因此，源于这些尾状物的墨的非受控分布在基材上形成杂散标记，从而破坏打印质量。
在第二操作模式中，喷射脉冲之间的间隔非常短。当以这种快速喷射方式操作时，团的排出如此迅速，以致团在仍与喷孔板24上的墨相连时就彼此结合。这导致形成单个大的滴(如图5所示)，然后，该大的滴在完全形成后离开喷孔板24。该第二操作模式避免了形成多个尾状物。
在第三操作模式中，喷射脉冲之间的间隔选择成长到足以避免修整的扩散(rectified diffusion)，而又短到足以使由脉冲序列排出的团在离开喷孔板24前往基材的途中，通过带状部(ligament)保持彼此相连。图6示出了示例性的一串这种团。
在该第三操作模式中，与团之间的带状部相关联的表面张力倾向于将团吸在一起而形成单个滴。这避免了形成多个可能会不可控制地飞溅到基材上的长尾状物。
与喷射脉冲相关联的确切数字参数取决于特定墨室10的详细情况以及墨的性质。然而，作为一般规则，喷射脉冲之间的时间间隔对应于这样一种频率，该频率低于墨室10的基本共振频率，但又不会低到致使团彼此分开而形成如图4所示的离散微滴。因此，喷射脉冲之间的该时间间隔大于表示为每秒周期数(cycles per second)的基本(即最低)共振频率的倒数。
对于墨在40℃具有11cps的粘性的情况，图3是一个示例性激励波形，该激励波形用于形成质量高达20ng的滴，并通过足以每50微秒就喷出一个这种滴的速率(即以20kHz的滴喷射频率)来达成。喷射脉冲彼此间隔约为15-16微秒(即脉冲重复频率为63.5kHz)。
可用于组成激励波形的喷射脉冲的脉冲延迟期和振幅选择为使激励波形的开始时间与由该波形形成的墨滴撞击基材的时间之间的间隔(本文称为“滴寿命(drop lifetime)”)独立于墨滴的尺寸。如本文所使用的，并如图8所示，激励波形的开始时间不必与用于该波形中的第一喷射脉冲的开始时间一致。例如，如果用于特定滴的激励波形只使用了三个可用喷射脉冲中的第二个，则可认为激励波形的开始时间是假设使用第一喷射脉冲时第一喷射脉冲开始的时间。以这种方法审慎选择喷射脉冲的振幅和延迟期意味着打印头驱动电路发送触发信号的时间是独立于滴尺寸的。更确切地，根据滴尺寸而变化的是从喷射脉冲模板中选择构成用于该墨滴的特定激励波形的那些喷射脉冲。这大大地简化了驱动电路的设计。
虽然图8示出了朝上延伸的脉冲，但这并非旨在表示任何关于用在驱动电路中的电流和电压的实际信号。图8的纵轴省略了任何关于极性的基准就是为了确保该一般原则。
在图3所示的喷射脉冲的特定模板中，电压下降随脉冲延迟而增大。因此，所形成的第一团的动量最低，而随后形成的团依次具有更高的动量。这允许后形成的团更容易追上早形成的团。
虽然图3所示的喷射脉冲模板只具有三个喷射脉冲，但本文所描述的原则可轻易地应用于具有任意数量喷射脉冲的激励波形。
图7示出了每隔5微秒所拍摄的照片，这些照片并排放置以示出三个团结合而形成单个滴。在30微秒标记时，慢速移动的第一团即将脱离喷孔板，并开始飞向基材的行程。然而，该第一团通过带状部继续与墨室10内的墨接触。
然后，在35微秒处，在第一团仍然与墨室10内的墨接触的同时，移动更快的第二团开始赶上第一团。在该过程中，第二团沿使第一团与墨室10中的墨相连接的带状部前进。
在40微秒处，第一团和第二团开始合并，并在45微秒时，滴通过第二团的质量而长大。同时，带状部继续伸展。
在50微秒时，快速移动的第三团从喷孔中出现，并迅速地沿带状部移动，以与第一团和第二团形成的滴接合。在以下15微秒内，第三团赶上所述滴，并与之合并。然后，在以下10微秒内，此时已经聚集了三个团的质量的所述滴终于脱离了喷孔板，并开始了飞向基材的行程。
用于形成较小的滴的激励波形将排出较少的团。因此，这种激励波形将与图3所示的相同，但喷射脉冲更少。例如，可通过只从图3的预定喷射脉冲中选择一个喷射脉冲来生成小墨滴，或者可从图3所示的三个预定喷射脉冲中选择两个喷射脉冲来生成稍大的墨滴。在一个实施例中，图3的第二喷射脉冲本身生成一团式墨滴，图3的第一和第三喷射脉冲协作以生成两团式墨滴，而图3所示的全部三个喷射脉冲协作以生成三团式墨滴。然而，可根据喷射脉冲模板中可用的脉冲延迟期和振幅的特定组合，来选择喷射脉冲的不同组合。例如，在某些情况下，可使用第一或第三喷射脉冲来生成一团式滴。在其它情况下，可使第一和第二脉冲协作或者使第二和第三脉冲协作来生成两团式墨滴。
在一些打印机中，可获得四种或四种以上的墨滴尺寸，在该情况下，喷射脉冲的模板将具有四个或四个以上的可用喷射脉冲。
总之，可用于组成激励波形的全体喷射脉冲包括振幅和延迟期选定为使不同墨滴尺寸的数量最大化的喷射脉冲，所述不同墨滴尺寸可在滴寿命独立于滴尺寸的限制条件下生成。在某些情况下，这包括提供大滴，该大滴具有足够的动量，以使该大滴的速度与较小的滴的速度相同。或者，如果大的滴和小的滴具有不同的速度，则可为移动较快的滴选择延迟期较长的喷射脉冲，从而让移动较慢的滴先出发。在这种情况下，移动较快的滴和移动较慢的滴将同时到达基材。
在多团式墨滴的情况下，与尾状物相关联的墨质量由最后一个喷射脉冲所形成的团的墨质量限制(capped)。因此，尾状物的质量与墨滴的质量不成比例。相反，随着墨滴变大，尾状物的质量与墨滴的质量的比率逐渐变小。
在图7所示的滴形成过程中，带状部实际上为压力脉冲从墨室10向第一团的传播形成了动态拉长的自由表面流体引导部或传输线。这些压力脉冲使其余团沿传输线朝第一团前进。
因为流体引导部的表面也是流体的表面，所以流体引导部是“自由表面”流体引导部，因此，流体引导部由形成带状部的墨的表面张力保持在一起。因此，墨的表面张力越大，流体引导部可维持得越长，并且后续团沿着引导部前进以与领先的团合并的时间就越多。
以上描述了本发明及其优选实施方式，其新颖性和要求专利保护的内容见权利要求。
权利要求书(按照条约第19条的修改)
1、一种使墨从喷墨打印机的墨室喷出的方法，该方法包括：
使第一团墨从所述墨室排出；
在经过选定间隔后，使第二团墨从所述墨室排出；
其中，所述间隔选定为大于所述室的基本共振频率的倒数，并且所述间隔选定为使所述第一团在所述第二团被排出时与所述墨室中的墨保持接触，
由此，在包括所述第一团和第二团的墨滴中，当所述墨滴离开所述喷墨打印机的喷孔板时，所述第一团和第二团通过带状部保持相连。
2、如权利要求1所述的方法，其中，使所述第二团喷出包括向所述第二团施加大于所述第一团的速度的速度。
3、如权利要求1所述的方法，其中，还包括：在经过所述选定间隔后，使第三团墨从所述墨室排出。
4、如权利要求3所述的方法，其中，使第三团墨排出包括向所述第三团施加大于所述第二团的速度的速度。
5、如权利要求1所述的方法，其中，还包括：将所述间隔选定为约15微秒到16微秒之间。
6、如权利要求1所述的方法，其中，还包括：使所述第一团和第二团具有第一动量和第二动量，所述第一动量和第二动量选定为使包含所述第一团和第二团的墨滴的滴寿命等于由单团墨形成的墨滴的滴寿命。
7、如权利要求1所述的方法，其中，使第一团墨和第二团墨排出包括从预定的喷射脉冲模板中选择喷射脉冲的组合。
8、如权利要求4所述的方法，其中，还包括：使所述第一团、第二团和第三团具有相应的第一动量、第二动量和第三动量，所述第一动量、第二动量和第三动量选定为使包含所述第一团、第二团和第三团的墨滴的滴寿命等于由两团墨形成的墨滴的滴寿命。
9、一种使墨从喷墨打印机头的墨室喷出的方法，该方法包括：
确定生成具有选定滴尺寸的墨滴所需的墨团的第一数量；
排出墨以形成长度随时间而增加的自由表面流体引导部，所述自由表面流体引导部在所述墨室中的墨与移动远离喷孔的领先墨团之间延伸；
使一组跟随墨团沿所述自由表面流体引导部朝所述领先团前进，所述一组跟随团的团数比所述第一数量少一个，这些团被大于所述墨室的基本共振频率的倒数的间隔暂时分开，
由此，当所述墨滴离开所述喷墨打印机的喷孔板时，所述墨团通过带状部保持相连。
10、如权利要求9所述的方法，其中，使一组跟随墨团沿所述自由表面流体引导部前进的步骤包括使所述跟随团以大于所述领先团的速度的速度前进。
11、一种机器可读介质，在该介质上编码有使墨从喷墨打印机的墨室喷出的软件，所述软件包括以下指令：
使第一团墨从所述墨室排出；
在经过选定间隔后，使第二团墨从所述墨室排出；
其中，所述间隔选定为大于所述室的基本共振频率的倒数，并且所述间隔选定为使所述第一团在所述第二团被排出时与所述墨室中的墨保持接触，
由此，在包括所述第一团和第二团的墨滴中，当所述墨滴离开所述喷墨打印机的喷孔板时，所述第一团和第二团通过带状部保持相连。
12、如权利要求11所述的机器可读介质，其中，用于使所述第二团喷出的指令包括以下指令：向所述第二团施加大于所述第一团的速度的速度。
13、如权利要求11所述的机器可读介质，其中，所述软件还包括以下指令：在经过选定间隔后，使第三团墨从所述墨室排出。
14、如权利要求13所述的机器可读介质，其中，用于使所述第三团墨排出的指令包括以下指令：向所述第三团施加大于所述第二团的速度的速度。
15、如权利要求11所述的机器可读介质，其中，所述软件还包括以下指令：将所述间隔选择为约15微秒到16微秒之间。
16、如权利要求11所述的机器可读介质，其中，所述软件还包括以下指令：使所述第一团和第二团具有第一动量和第二动量，所述第一动量和第二动量选定为使包含所述第一团和第二团的墨滴的滴寿命等于由单团墨形成的墨滴的滴寿命。
17、如权利要求11所述的机器可读介质，其中，用于使第一墨团和第二墨团排出的指令包括以下指令：从预定的喷射脉冲模板中选择喷射脉冲的组合。
18、如权利要求14所述的机器可读介质，其中，所述软件还包括以下指令：使所述第一团、第二团和第三团具有相应的第一动量、第二动量和第三动量，所述第一动量、第二动量和第三动量选定为使包含所述第一团、第二团和第三团的墨滴的滴寿命等于由两团墨形成的墨滴的滴寿命。
19、一种机器可读介质，在该介质上编码有使墨从喷墨打印机头的墨室喷出的软件，所述软件包括以下指令：
确定生成具有选定滴尺寸的墨滴所需的墨团的第一数量；
排出墨以形成长度随时间而增加的自由表面流体引导部，所述自由表面流体引导部在所述墨室中的墨与移动远离喷孔的领先墨团之间延伸；
使一组跟随墨团沿所述自由表面流体引导部朝所述领先团前进，所述一组跟随团的团数比所述第一数量少一个，这些团被大于所述墨室的基本共振频率的倒数的间隔暂时分开，
由此，当所述墨滴离开所述喷墨打印机的喷孔板时，所述墨团通过带状部保持彼此相连。
20、如权利要求19所述的机器可读介质，其中，使一组跟随墨团沿所述自由表面流体引导部前进的指令包括以下指令：使所述跟随团以大于所述领先团的速度的速度前进。
21、一种用于喷墨打印机的压电打印头，所述打印头包括：
限定出墨室的壁；
与所述墨室机械连通的压电致动器；
用于控制所述压电致动器的控制器，所述控制器配置成使所述压电致动器完成以下动作：
从所述墨室排出第一团墨，并且在经过选定间隔后，
从所述墨室排出第二团墨，
其中，所述间隔选定为大于所述室的基本共振频率的倒数，并且所述间隔选定为使所述第一团在所述第二团被排出时与所述墨室中的墨保持接触，
由此，在包括所述第一团和第二团的墨滴中，当所述墨滴离开所述喷墨打印机的喷孔板时，所述第一团和第二团通过带状部保持相连。

Claims (21)

1、一种使墨从喷墨打印机的墨室喷出的方法，该方法包括：
使第一团墨从所述墨室排出；
在经过选定间隔后，使第二团墨从所述墨室排出；
其中，所述间隔选定为大于所述室的基本共振频率的倒数，并且所述间隔选定为使所述第一团在所述第二团被排出时与所述墨室中的墨保持接触。
2、如权利要求1所述的方法，其中，使所述第二团喷出包括向所述第二团施加大于所述第一团的速度的速度。
3、如权利要求1所述的方法，其中，还包括：在经过所述选定间隔后，使第三团墨从所述墨室排出。
4、如权利要求3所述的方法，其中，使第三团墨排出包括向所述第三团施加大于所述第二团的速度的速度。
5、如权利要求1所述的方法，其中，还包括：将所述间隔选定为约15微秒到16微秒之间。
6、如权利要求1所述的方法，其中，还包括：使所述第一团和第二团具有第一动量和第二动量，所述第一动量和第二动量选定为使包含所述第一团和第二团的墨滴的滴寿命等于由单团墨形成的墨滴的滴寿命。
7、如权利要求1所述的方法，其中，使第一团墨和第二团墨排出包括从预定的喷射脉冲模板中选择喷射脉冲的组合。
8、如权利要求4所述的方法，其中，还包括：使所述第一团、第二团和第三团具有相应的第一动量、第二动量和第三动量，所述第一动量、第二动量和第三动量选定为使包含所述第一团、第二团和第三团的墨滴的滴寿命等于由两团墨形成的墨滴的滴寿命。
9、一种使墨从喷墨打印机头的墨室喷出的方法，该方法包括：
确定生成具有选定滴尺寸的墨滴所需的墨团的第一数量；
排出墨以形成长度随时间而增加的自由表面流体引导部，所述自由表面流体引导部在所述墨室中的墨与移动远离喷孔的领先墨团之间延伸；
使一组跟随墨团沿所述自由表面流体引导部朝所述领先团前进，所述一组跟随团的团数比所述第一数量少一个，这些团被大于所述墨室的基本共振频率的倒数的间隔暂时分开。
10、如权利要求9所述的方法，其中，使一组跟随墨团沿所述自由表面流体引导部前进的步骤包括使所述跟随团以大于所述领先团的速度的速度前进。
11、一种机器可读介质，在该介质上编码有使墨从喷墨打印机的墨室喷出的软件，所述软件包括以下指令：
使第一团墨从所述墨室排出；
在经过选定间隔后，使第二团墨从所述墨室排出；
其中，所述间隔选定为大于所述室的基本共振频率的倒数，并且所述间隔选定为使所述第一团在所述第二团被排出时与所述墨室中的墨保持接触。
12、如权利要求11所述的机器可读介质，其中，用于使所述第二团喷出的指令包括以下指令：向所述第二团施加大于所述第一团的速度的速度。
13、如权利要求11所述的机器可读介质，其中，所述软件还包括以下指令：在经过选定间隔后，使第三团墨从所述墨室排出。
14、如权利要求13所述的机器可读介质，其中，用于使所述第三团墨排出的指令包括以下指令：向所述第三团施加大于所述第二团的速度的速度。
15、如权利要求11所述的机器可读介质，其中，所述软件还包括以下指令：将所述间隔选择为约15微秒到16微秒之间。
16、如权利要求11所述的机器可读介质，其中，所述软件还包括以下指令：使所述第一团和第二团具有第一动量和第二动量，所述第一动量和第二动量选定为使包含所述第一团和第二团的墨滴的滴寿命等于由单团墨形成的墨滴的滴寿命。
17、如权利要求11所述的机器可读介质，其中，用于使第一墨团和第二墨团排出的指令包括以下指令：从预定的喷射脉冲模板中选择喷射脉冲的组合。
18、如权利要求14所述的机器可读介质，其中，所述软件还包括以下指令：使所述第一团、第二团和第三团具有相应的第一动量、第二动量和第三动量，所述第一动量、第二动量和第三动量选定为使包含所述第一团、第二团和第三团的墨滴的滴寿命等于由两团墨形成的墨滴的滴寿命。
19、一种机器可读介质，在该介质上编码有使墨从喷墨打印机头的墨室喷出的软件，所述软件包括以下指令：
确定生成具有选定滴尺寸的墨滴所需的墨团的第一数量；
排出墨以形成长度随时间而增加的自由表面流体引导部，所述自由表面流体引导部在所述墨室中的墨与移动远离喷孔的领先墨团之间延伸；
使一组跟随墨团沿所述自由表面流体引导部朝所述领先团前进，所述一组跟随团的团数比所述第一数量少一个，这些团被大于所述墨室的基本共振频率的倒数的间隔暂时分开。
20、如权利要求19所述的机器可读介质，其中，使一组跟随墨团沿所述自由表面流体引导部前进的指令包括以下指令：使所述跟随团以大于所述领先团的速度的速度前进。
21、一种用于喷墨打印机的压电打印头，所述打印头包括：
限定出墨室的壁；
与所述墨室机械连通的压电致动器；
用于控制所述压电致动器的控制器，所述控制器配置成使所述压电致动器完成以下动作：
从所述墨室排出第一团墨，并且在经过选定间隔后，
从所述墨室排出第二团墨，
其中，所述间隔选定为大于所述室的基本共振频率的倒数，并且所述间隔选定为使所述第一团在所述第二团被排出时与所述墨室中的墨保持接触。
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