公开(公告)号：EP0323991B1

公开(公告)日：1993-05-12

申请号：EP88905825.1

申请日：1988-07-11

申请人： Hertz, Hans Martin ,  Hertz, Thomas Gustav

发明人： SAMUELSSON, Bo, A. ,  HERTZ, Carl, Helmut (deceased)

IPC分类号： B41J2/115

CPC分类号： B41J2/115

摘要： In an ink jet recording apparatus, the generation of insufficiently charged or discharged drops is avoided which may occur when a charge controlling signal (print pulse) is switched within a forbidden zone of the period of the drop formation process. The region of the drop formation process period, during which the switching is permitted, is determined by detecting the charge carried by trains of drops which are produced by probe charge control signals of varying phase relative to the drop formation process.

公开(公告)号：EP0293496B1

公开(公告)日：1991-06-26

申请号：EP87105560.4

申请日：1987-04-14

申请人： Hertz, Hans Martin ,  Hertz, Thomas Gustav

发明人： Hertz, Carl Hellmuth ,  Samuelsson, Bo A.

IPC分类号： B41J2/07

CPC分类号： B41J2/2128 ,  B41J2/115 ,  B41J2002/1853

公开(公告)号：EP0323989B1

公开(公告)日：1992-01-22

申请号：EP88905812.9

申请日：1988-07-06

申请人： Hertz, Hans Martin ,  Hertz, Thomas Gustav

发明人： Hertz, Carl Hellmuth

IPC分类号： B41J2/07

CPC分类号： B41J2/12

摘要： An improved ink jet recording method comprises the steps producing at least one ink jet (6) which disintegrates into a series of minute drops, selectively charging the drops to determine whether an individual drop, in a recording mode, is intended to travel along a recording path to impinge onto a predetermined location on an ink receiving surface (12) or is prevented to produce a record on said surface, deflecting each charged drop by an electric deflecting field by an amount depending on the charge of the drop (6), and effecting relative transverse motion between the path of the record producing drops and the record surface, determining any deviation between said predetermined location and an actual location of impingement of the jet, and applying an adjustable bias charge being chosen so that the deflection of the drop caused by the action of said electric deflecting field on said bias charge carried by said drop minimizes said deviation.

公开(公告)号：EP0210251B1

公开(公告)日：1990-05-09

申请号：EP86901159.3

申请日：1986-01-28

申请人： Hertz, Hans Martin ,  Hertz, Thomas Gustav

发明人： HERTZ, Carl Hellmuth ,  SAMUELSSON, Bo

IPC分类号： B41J2/005 ,  B41J2/08

CPC分类号： B41J2/2103 ,  B41J2/185 ,  H04N1/40031

摘要： Method and apparatus for making high resolution color prints using ink jet techniques. The method and apparatus of providing for precise control of the number of droplets of printing fluid which is deposited in a pixel on recoding paper. The precise control is achieved by incremental control of the print pulse width or time duration. Further precision can be obtained by synchronizing droplet formation with for example, the leading edge of the print pulse. The number of droplets charged during the time duration of the print pulse are the number of droplets which impinge on the paper and at the pixel location. The number of droplets creates therefore a color density. Use of a plurality of nozzles and ink colors will permit the production of very high resolution and high quality color prints.

公开(公告)号：EP0293496A1

公开(公告)日：1988-12-07

申请号：EP87105560.4

申请日：1987-04-14

申请人： Hertz, Hans Martin ,  Hertz, Thomas Gustav

发明人： Hertz, Carl Hellmuth ,  Samuelsson, Bo A.

IPC分类号： B41J2/07

CPC分类号： B41J2/2128 ,  B41J2/115 ,  B41J2002/1853

摘要： An ink jet printing method is disclosed, wherein a record is produced by applying varying amounts of ink on a plurality of pixel locations of a record medium, said method comprising the steps:

a) generating an ink jet directed towards said record medium, said ink jet breaking up into a series of drops with a predetermined drop formation rate,
b) applying an electric charge of predetermined magnitude to selected drops,
c) deflecting each charged drop as a function of its charge to determine whether the drop travels along a recording path to reach said recording medium or is intercepted,
d) producing relative transverse movement between said drop path and said recording medium,
e) generating a first signal indicative of the drop formation rate,
f) generating a second signal from said relative movement, the second signal being indicative that pixel position on the record medium is aligned with said drop path,
g) deriving a density value for the aligned pixel position in response to said a second signal,
h) generating a print pulse signal of predetermined length between leading and trailing edges in response to said derived density value and said first signal, said density value controlling the length and said first signal controlling the time of occurrence of the leading edge of said print pulse signal,
i) controlling said charging step (b) by means of said print pulse signal.

To reduce the graininess of the image recorded by the jet, said first and second signals are synchronized to establish a predetermi­ned time relationship between the time at which said density value deriving step (g) occurs and the time when the leading edge of the print pulse occurs.

摘要翻译： 公开了一种喷墨打印方法，其中通过在记录介质的多个像素位置上施加不同量的墨来产生记录，所述方法包括以下步骤：a）产生朝向所述记录介质的喷墨，所述墨 射流以预定的液滴形成速率分裂成一系列液滴，b）对所选择的液滴施加预定大小的电荷，c）根据其电荷使每个充电液滴偏转，以确定液滴是否沿着记录路径行进 到达所述记录介质或被截取，d）在所述液滴路径和所述记录介质之间产生相对的横向运动，e）产生指示液滴形成速率的第一信号，f）从所述相对运动产生第二信号， 信号指示记录介质上的像素位置与所述液滴路径对准，g）响应于所述液滴路径导出对齐的像素位置的浓度值 第二信号，h）响应于所述导出的密度值和所述第一信号产生在前缘和后缘之间的预定长度的打印脉冲信号，所述密度值控制长度，并且所述第一信号控制前缘的出现时间 所述打印脉冲信号，i）通过所述打印脉冲信号控制所述充电步骤（b）。 为了减少由射流记录的图像的颗粒度，所述第一和第二信号被同步，以在所述浓度值导出步骤（g）发生的时间与所述打印脉冲的前沿之间的时间之间建立预定的时间关系 发生。