CN100584614C - 打印头的可变驱动 - Google Patents

打印头的可变驱动 Download PDF

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CN100584614C
CN100584614C CN200480027289A CN200480027289A CN100584614C CN 100584614 C CN100584614 C CN 100584614C CN 200480027289 A CN200480027289 A CN 200480027289A CN 200480027289 A CN200480027289 A CN 200480027289A CN 100584614 C CN100584614 C CN 100584614C
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W·S·伊顿
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Hewlett Packard Development Co LP
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Abstract

同时驱动打印头的可变数量的点火电阻器的驱动器包括用于提供对可变数量的点火电阻器点火的驱动信号的驱动电路以及用于根据要同时点火的点火电阻器的可变数量来调节驱动信号的电压或电流幅度的电路。

Description

打印头的可变驱动
技术领域
一般来说，本发明涉及打印机，更具体来说，本发明涉及打印机中的打印头的驱动电路。
背景技术
[0001]热喷墨打印头采用墨滴喷射器，它包括点火电阻器，以便在点火室中蒸发液体，从而通过分别与点火室关联的喷嘴产生液滴喷射。有一种趋势是增加打印头上的点火室及关联电阻器的数量，从而引起驱动点火电阻器的增加的复杂度。过去，通常采用多个驱动器向点火电阻器的不同组施加点火信号。给定驱动器一次仅对一个电阻器点火减少或防止因寄生效应而可能发生的能量变化误差项，但是以增加的互连复杂度和性能为代价。由于这些及其它原因，需要本发明。
发明内容
[0002]同时驱动打印头的可变数量的点火电阻器的驱动器包括用于提供对可变数量的点火电阻器点火的驱动信号的驱动电路以及用于根据要同时点火的点火电阻器的可变数量来调节驱动信号的电压或电流的幅度。
在本发明的一个方面，提供一种用于为打印头中的关联喷嘴同时驱动可变数量的点火电阻器的驱动器电路，所述驱动器电路包括：电压源，用于提供具有预定幅度的电源电压；喷嘴计数器，用于确定其电阻器要在给定点火周期中被点火的可变数量的喷嘴的喷嘴计数；可编程偏移发生器，用于根据所述喷嘴计数来计算和产生偏移电压，其中所述偏移电压等于电源电压减去固定偏移电压再减去数据可变偏移电压；驱动电路，其输出连接到用于与打印头连接的电路输出端子，所述驱动电路用于产生点火脉冲和选择性地向电路输出端子施加点火脉冲，所述点火脉冲的峰值幅度等于所述偏移电压的幅度。
在本发明的另一个方面，一种用于驱动具有一组点火电阻器的喷墨打印头的方法，各点火电阻器响应用于从相应喷嘴喷射墨水的点火脉冲，各电阻器可选择性地连接到驱动器电路，使得可变数量的电阻器可同时连接到驱动器电路，以便在脉冲周期中接收能量脉冲，所述方法包括，在所述驱动器电路中：确定在脉冲周期中要同时连接到能量源的电阻器的可变数量；提供具有预定幅度的电源电压；根据电阻器的所述确定的可变数量来计算和产生偏移电压，其中所述偏移电压等于电源电压减去固定偏移电压再减去数据可变偏移电压；产生点火脉冲，所述点火脉冲的峰值电压幅度等于所述偏移电压的幅度，以及把所述点火脉冲施加到用于与打印头连接的电路输出端子。
附图说明
[0003]通过结合附图阅读以下详细说明，本领域的技术人员易于理解本公开的特征和优点，附图包括：
[0004]图1是简化示意框图，说明打印头和打印头控制器的根据本发明的一个实施例。
[0005]图2是简化的打印头电路。
[0006]图3是作为要点火的打印头电阻器的数量的函数所施加的点火信号电压的根据本发明的一个实施例的图形说明。
[0007]图4是简化示意图，说明图1的打印头控制器电路的点火驱动器电路的根据本发明的一个实施例。
[0008]图5是作为时间的函数的示范点火脉冲的图形说明。
[0009]图6是包括图4的示范电路的偏移发生器的根据本发明的一个实施例的原理框图。
[0010]图6A是示范偏移电压的表。
[0011]图7是用于实现包括图4的电路的偏移发生器的根据本发明的示范电路的原理图。
[0012]图8是用于实现包括图4的电路的栅极驱动和电平移位电路、dv/dt感测电路以及栅极驱动电路的功能的根据本发明的示范电路的电路原理图。
[0013]图9是简化示意框图，说明打印头和打印头控制器的根据本发明的一个备选实施例。
具体实施方式
[0014]在以下详细说明以及附图的若干图中，相似的元件采用相似的参考标号来标识。
[0015]打印头点火配置的一个实施例以图1中的简化形式来说明。喷墨打印头50具有一组点火电阻器60，它们被激励而使液体、例如墨水的液滴从相应点火室通过相应喷嘴射出，如本领域已知的那样。这个示范实施例中的打印头50从打印头控制100接收一组控制信号和一组点火脉冲。控制信号在点火周期中选择要点火的特定电阻器，以及点火脉冲施加到被选择要点火的电阻器。
[0016]在这个示范实施例中，控制信号和点火脉冲由打印头控制电路100提供。电路100接收标识连续点火周期的点火模式的打印数据。这个数据由控制逻辑110转换为控制信号，控制信号被提供给打印头，以及点火控制信号被提供给点火驱动电路130。打印数据还被施加到电阻器求和电路或喷嘴计数器120。考虑多个点火驱动电路可用来驱动点火电阻器的通常称作“基元”的相应子集。例如，点火驱动电路驱动的点火电阻器的各子集在一个实施例中可包括八个点火电阻器、在另一个实施例中包括十六个点火电阻器以及在又一个实施例中包括六十四个点火电阻器。给定控制电路100的点火驱动电路的具体数量将取决于具体打印头、即打印头上的点火电阻器的数量以及其它应用特定参数。各点火电路具有关联电阻器求和或计数器电路，以便确定在点火周期中具体子集中要点火的电阻器的数量。
[0017]电阻器求和电路120分析点火周期的打印数据，以便确定可由点火电路130驱动的电阻器中的多少电阻器将在此周期中被点火。在一个示范实施例中，电路120实现为逐位加法器。电路120产生信号DSUM，它的值表示电阻器的那个数量。例如，如果可由点火电路130驱动的电阻器的数量为八，则DSUM信号值可表明对于给定的点火周期从0个电阻器到最多8个电阻器。下表描述一个实施例的示范输出，其中基元大小为八个喷嘴。
DSUM输出解码
输入                    输出
要点火的电阻器数量      DSUM
0                       0
1                       1
2                       2
3                       3
4                       4
5                       5
6                       6
7                       7
8                       8
[0018]示范点火电路130接收来自控制逻辑110的点火控制信号以及来自电阻器求和120的DSUM信号，并且在点火周期中产生点火脉冲，其电压幅度取决于点火数据，并且具体作为DSUM信号的函数而变化。在示范实施例中，点火脉冲电压的幅度与此周期中要点火的电阻器的数量成正比，以及具体地随着要点火的电阻器数量增加而单调增加。
[0019]考虑图2所示的简化示范打印头电路模型。打印头点火电压V点火通过寄生电阻64、即共模误差电阻Rc施加到打印头点火电阻器60-1...60-n。点火电阻器中的每个与FET开关串联，FET开关的电阻表示为相应电阻62-1...62-n。FET开关的状态由施加到打印头的打印头控制信号来控制。共模误差电阻对于点火电阻和FET电阻的并联组合用作分压器。施加到各点火FET电阻器引脚的电压V喷嘴根据被点火的喷嘴数量而改变，使送往各被点火喷嘴的电流I1...In以及因而使能量变化。这个变化是由于从共模电阻产生的分压器作用引起的。
[0020]为了补偿能量的这个变化，点火电压的幅度V点火根据给定点火周期中被点火的喷嘴数量而变化。图3以图解方式说明对于示范实施例作为被点火喷嘴数量的函数的这种变化。V点火随着被点火的喷嘴数量增加而单调增加，使得施加到各喷嘴的电压V喷嘴实质上保持恒定。VP为点火驱动电路的电源电压，并且也是恒定的。
[0021]在另一个实施例中，可根据给定点火周期中被点火的喷嘴数量来控制电阻器驱动信号的电流特性，而不是如上所述的电压特性。在这种备选实施例中，电流I点火的幅度随着此周期中同时被点火的喷嘴数量增加而增加。
[0022]点火驱动电路130的一个实施例如图4示意表示。在电路的输出侧是串联连接在电压节点VP与地之间的两个FET晶体管132、134。点火电压V点火在两个FET之间的节点133上、在VP下的可变偏移电压下产生。可变偏移电压由偏移发生器140来设置，它根据值DSUM、即给定点火周期中要点火的电阻器数量来设置偏移发生器的输出电压值ΔV。响应点火数据、偏移发生器的输出电压值AV以及来自dv/dt感测电路160的信号，栅极驱动和电平移位电路150设置FET 132上的栅极驱动。响应点火控制信号和来自电路160的信号，栅极驱动电路170设置FET 134上的栅极驱动。
[0023]通过设置高端FET 132上的适当驱动，栅极驱动电路150用于将点火电压脉冲最大值设置为偏移发生器140的输出电压值，以及还提供适当的脉冲接通整形。图5说明示范点火电压脉冲，其中栅极驱动电路150设置斜坡一直到由偏移发生器所设置的电压。dV/dt感测电路160用于控制上斜坡特性，以及通过栅极驱动电路170和FET134，响应来自电路110(图1)的点火控制信号而在脉冲结束时下拉节点133上的电压。因此，电路160在点火脉冲结束时设置下斜坡斜率。
[0024]图6是可编程偏移发生器140的原理框图。存在由固定偏移140A提供的固定偏移电压以及由可变偏移140B提供的取决于DSUM的数据可变偏移电压(DSUM偏移)。图6A表示对于点火驱动电路对多达八个喷嘴点火的情况的从VP的示范偏移电压的表，其中，偏移电压四舍五入到最接近的0.1伏特。对于这个实例，固定偏移为1.0伏特。在这个实施例中，偏移发生器140的输出为电压值ΔV＝VP-固定偏移电压-DSUM偏移电压。
[0025]图7是用于实现偏移发生器140的示范电路的原理图。或者可采用其它电路配置。图7的电路实现数模转换功能，从而将数字值(DSUM)转换为相应电压。电路140包括串联连接在电压VP与地之间的电阻器140-1和FET 140-2。电流镜像电路包括温度稳定参考电压VREF，其中电阻器140-3和FET 140-4串联连接在参考电压与地之间。参考电流驱动晶体管140-2、140-5、140-6、140-7和140-8的栅极。FET 140-5至140-8的结的大小不同，其中晶体管140-5具有大小x，140-6具有大小2x，140-7具有大小4x，以及140-8具有大小8x。因此，晶体管140-6在导通状态传导140-5两倍的电流，晶体管140-7在导通状态传导140-5四倍的电流，以及晶体管140-8在导通状态传导140-5八倍的电流。电路140的输出在节点140-20上取出。晶体管140-5至140-8的每个通过相应的晶体管开关140-9至140-12连接在地与节点140-20之间。各晶体管开关的栅极通过解码器140-13的输出来驱动，解码器140-13在由使能信号(ENABLE_ΔV_ADJ)启用时将DSUM解码为在输出140-14至140-17处相应的导通或截止状态。解码器输出根据DSUM的值来接通开关140-9至140-12中所选的一些，它们又通过相应FET 140-5至140-8将节点140-20连接到电流镜像电路。这将增加通过电阻器140-1汲取的电流以及相应的偏移发生器的输出电压ΔV。
[0026]图8是用于实现图4的栅极驱动和电平移位电路150、dv/dt感测电路160以及栅极驱动电路170的功能的示范电路180的电路原理图。在这个电路配置中，晶体管Q1和Q2经过连接，以便将偏移发生器的输出电压ΔV传送到驱动器运算放大器O1的输入端。电容器C1和电流I1控制点火脉冲的上升沿dV/dt。电流I3和电容器C2控制下降沿dV/dt。放大器O1主动控制FET 132的栅极以传递预期输出电压(ΔV)和dV/dt特性。FET Q3响应点火数据而接通/断开高端FET132。FET Q4响应点火数据而接通/断开低端驱动器134。或者也可采用其它电路配置。
[0027]在另一个实施例中，点火脉冲的脉冲宽度取决于如US5677577所述的被点火喷嘴数量以及点火电压V点火的幅度。图9说明采用可变脉冲宽度和可变电压的点火脉冲来驱动打印头的打印头控制100’的一个实施例。在这种情况中，控制逻辑110’响应打印数据，产生发起打印头点火周期开始的“触发点火”信号以及打印头的控制信号。如打印头控制100(图1)的实施例中那样，打印数据也被施加到电阻器求和电路120。电阻器求和电路120分析点火周期的打印数据，以便确定可由点火电路130驱动的电阻器中的多少电阻器将在此周期中被点火。
[0028]打印头控制100’还包括脉冲宽度调节电路功能112以及点火定时器电路114。脉冲宽度调节电路112将DSUM信号转换为点火脉冲宽度信号，它确定要由点火驱动电路130提供给打印头的点火脉冲的宽度。电路112在一个示范实施例中可提供查找表转换功能，因而DSUM信号值提供相应点火脉冲宽度值的地址。一般来说，越多电阻器在给定点火周期中被点火，则脉冲宽度越长。
[0029]点火定时器电路114响应触发点火信号和点火脉冲宽度信号，以便对点火驱动电路130产生点火控制信号。因此，点火脉冲的开始由控制逻辑110’来触发，以及脉冲的长度由点火定时器114来设置。在一个示范实施例中，点火定时器电路114可包括状态机，但是也可采用其它实现。
[0030]示范点火电路130接收来自控制逻辑110的触发点火信号以及来自电阻器求和120的DSUM信号，并且在点火周期中产生点火脉冲，其电压幅度和脉冲宽度取决于点火数据，具体作为DSUM信号的函数而变化。在示范实施例中，点火脉冲电压的幅度与此周期中要点火的电阻器的数量成正比，具体随着要点火的电阻器数量增加而单调增加。脉冲宽度随着要点火的电阻器数量增加而单调增加。
[0031]图9的实施例允许可变点火电压的幅度和脉冲宽度最大值的灵活性。通过在一个示范实施例中采用两种变量，与仅采用可变脉冲宽度或点火电压的实施例相比，最大点火电压和脉冲宽度可减小。
[0032]虽然以上所述是本发明的具体实施例的描述和说明，但是，本领域的技术人员可对它们进行各种修改和变更，而没有背离以下权利要求所规定的本发明的范围和实质。

Claims (8)

1.一种用于为打印头中的关联喷嘴同时驱动可变数量的点火电阻器的驱动器电路，所述驱动器电路包括：
电压源，用于提供具有预定幅度的电源电压；
喷嘴计数器，用于确定其电阻器要在给定点火周期中被点火的可变数量的喷嘴的喷嘴计数；
可编程偏移发生器，用于根据所述喷嘴计数来计算和产生偏移电压，其中所述偏移电压等于电源电压减去固定偏移电压再减去数据可变偏移电压；
驱动电路，其输出连接到用于与打印头连接的电路输出端子，所述驱动电路用于产生点火脉冲和选择性地向电路输出端子施加点火脉冲，所述点火脉冲的峰值幅度等于所述偏移电压的幅度。
2.如权利要求1所述的驱动器电路，其特征在于，当所述喷嘴的数量增加时，所述点火脉冲的所述峰值幅度增大。
3.如权利要求1所述的驱动器电路，其特征在于，所述偏移电压被作为喷嘴的所述可变数量的单调增加函数来计算。
4.如权利要求1所述的驱动器电路，其特征在于，还包括dV/dt感测电路，用于控制点火脉冲的前沿和后沿的梯度。
5.一种用于驱动具有一组点火电阻器的喷墨打印头的方法，各点火电阻器响应用于从相应喷嘴喷射墨水的点火脉冲，各电阻器可选择性地连接到驱动器电路，使得可变数量的电阻器可同时连接到驱动器电路，以便在脉冲周期中接收能量脉冲，所述方法包括，在所述驱动器电路中：
确定在脉冲周期中要同时连接到能量源的电阻器的可变数量；
提供具有预定幅度的电源电压；
根据电阻器的所述确定的可变数量来计算和产生偏移电压，其中所述偏移电压等于电源电压减去固定偏移电压再减去数据可变偏移电压；
产生点火脉冲，所述点火脉冲的峰值电压幅度等于所述偏移电压的幅度，以及把所述点火脉冲施加到用于与打印头连接的电路输出端子。
6.如权利要求5所述的方法，其特征在于，当所述电阻器的数量增加时，所述点火脉冲的所述峰值电压幅度增大。
7.如权利要求5所述的方法，其特征在于，所述偏移电压是电阻器的所述可变数量的单调增加函数。
8.如权利要求5所述的方法，其特征在于，还包括利用dV/dt感测电路控制点火脉冲的前沿和后沿的梯度。
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