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Method for printing a two-dimensional bitmap image with multiple pixels per line

A technology of bit mapping and pixels, applied in printing and other directions

Active Publication Date: 2017-06-23
TONEJET CORP PTY LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Such a solution works but is difficult to implement in practice, since the control electronics and software must be able to handle pulses of highly variable duration, which expand to be larger than the pixel period, resulting in the need to specify a greater degree of pulse length without loss of sharpness. Large data bit depths and thus require more complex electronics

Method used

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  • Method for printing a two-dimensional bitmap image with multiple pixels per line
  • Method for printing a two-dimensional bitmap image with multiple pixels per line
  • Method for printing a two-dimensional bitmap image with multiple pixels per line

Examples

Experimental program
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Embodiment Construction

[0065] Before describing an example of the method according to the invention, two types of The method of the volume of ink droplets printed (or ejected) may be useful.

[0066] Figure 4 Shows a block diagram of the circuit 30, which can be used to control the ejection voltage pulse V to each ejector (the column 2 and the tip 21) of the print head 1 E Therefore, the value Pn of the bitmap pixel to be printed (8-bit number, which has a value between 0 and 255) is converted into a low voltage amplitude through the digital-to-analog converter 31, and the output of the digital-to-analog converter 31 Passes a pulse of fixed duration V G Strobe, pulse V of fixed duration G Limit the high voltage pulse V applied to the ejector of the print head P Duration. This low-voltage pulse is then amplified by a high-voltage linear amplifier 32 to generate a high-voltage pulse V whose amplitude is usually 100 to 400V depending on the pixel bit value. P , Which in turn applies a bias voltage V B An...

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PUM

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Abstract

The present invention relates to a method of printing a two-dimensional bit-mapped image having a plurality of pixels per row, a printhead having rows of jetting channels, each jetting channel having an associated jetting electrode, to which a voltage is applied, in use, to the associated jetting electrode, and wherein, in During printing, in order to cause a volume of fluid to be ejected from a selected firing channel of the printhead for printing, a voltage pulse having a value of a predetermined magnitude and duration is applied to the electrodes of the selected firing channel at a given pulse period, the predetermined magnitude and duration are determined by the corresponding image pixel bit values ​​generated by the raster image processor. scanning the portion of the raster image corresponding to the ejection channel to determine the number of periods of non-printing pixels adjacent to the pixel to be printed, and immediately before the pixel to be printed, applying a voltage pulse having a value predetermined as a function of time to the ejection electrode, This time is measured in units of a given pixel period between the last pixel to be printed and said pixel to be printed.

Description

Background technique [0001] The present invention relates to electrostatic inkjet printing technology, and more specifically, to print heads and printers of the type described in WO93 / 11866 and related patent specifications. [0002] This type of electrostatic printer first gathers and then ejects charged solid particles dispersed in a chemically inert insulating carrier fluid by using an applied electric field, and ejects the solid particles. Aggregation occurs because the applied electric field causes electrophoretic and charged particles to move towards the substrate in the electric field until they meet the surface of the ink. Ejection occurs when the applied electric field creates an electrophoretic force large enough to overcome surface tension. The electric field is generated by creating a potential difference between the ejection location and the substrate; this can be achieved by applying a voltage to the electrodes at and / or around the ejection location. A specific adv...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B41J2/06B41J2/045
CPCB41J2/04536B41J2/04576B41J2/06B41J2/065B41J2/095B41J2/085B41J2/04573B41J2/04586
Inventor 彼得·詹姆士·布朗罗宾·蒂莫西·培根安德鲁·约翰·科里平戴尔伊万·亨德里克·康拉迪艾马尔·列奇奇比约翰·劳顿·夏普
Owner TONEJET CORP PTY LTD