One unit print using multiple picture elements as hus reproducing

A pixel position and pixel technology, applied in the field of printing technology, can solve the problems of limited local tone reproducibility and low degree of freedom of local tone reproducibility

Inactive Publication Date: 2002-12-18
SEIKO EPSON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, in the case of using one type of drive signal, the average ink discharge amount per pixel can only be changed in about three steps at most.
Therefore, the local tone reproducibility of each pixel is also limited by this
In other words, local tone reproducibility achieved by adjusting the ink discharge amount on each pixel has a problem that its degree of freedom is rather low

Method used

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  • One unit print using multiple picture elements as hus reproducing
  • One unit print using multiple picture elements as hus reproducing
  • One unit print using multiple picture elements as hus reproducing

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0168] In each of the above-mentioned embodiments, the ejection of the ink droplets on one main scanning line is completed by three main scans, but the number of main scans performed on one main scanning line is not limited to three times, and may be more than four times. .

Deformed example 2

[0170] In each of the above-described embodiments, a pixel pair is constituted by consecutive pixels in the main scanning direction, but a pixel pair may be constituted by consecutive pixels in the sub-scanning direction. In addition, in each of the above-described embodiments, a pixel pair is used as a unit of partial tone reproduction, but three or more consecutive pixels may be used as a unit of partial tone reproduction. In general, N pixels (N is an integer greater than or equal to 2) continuous in one of the main scanning direction and the sub scanning direction may be set as one unit of tone reproduction. At this time, the amount of ink that can be discharged at at least one pixel position among the N pixels is set to a value different from the amount of ink that can be discharged at other pixel positions.

[0171] In addition, in each of the above-described embodiments, the number of tones that can be partially reproduced is five, but the number of tones may be set to ...

Deformed example 3

[0173] The invention can also be applied to drum scan printers. In a drum scanning printer, the drum rotation direction is the main scanning direction, and the carriage running direction is the sub scanning direction. Furthermore, the present invention can be applied not only to inkjet printers but also to printing devices that generally print on the surface of a printing medium with a print head having a plurality of nozzles. Examples of such printing devices include facsimile devices, copying devices, and the like.

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PUM

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Abstract

In the first embodiment, tone reproduction is performed with the same ink as follows: (i) N pixels (N is an integer greater than or equal to 2) that are continuous along one of the main scanning direction and the sub-scanning direction are set as the tone 1 unit of reproduction; (ii) setting the amount of ink that can be spit out at least one pixel position among the above N pixels to a value different from the amount of ink that can be spit out at other pixel positions; (iii) by adjusting The amount of ink at each pixel position of the above-mentioned N pixels reproduces M tones (M is an integer greater than or equal to N+2) for each of the above-mentioned N pixels. In the second embodiment, low-resolution image data is generated from high-resolution image data. This low-resolution image data is generated as a pixel group consisting of a plurality of adjacent pixels at high resolution. Using this image data, ink droplets are ejected from a plurality of nozzles to each pixel at high resolution.

Description

technical field [0001] The present invention relates to a printing technique for printing by ejecting ink droplets. Background technique [0002] In recent years, inkjet printers that discharge ink from a print head have been widely used as output devices for computers. In addition, conventional inkjet printers can only reproduce each pixel with binary values ​​of "ON" and "OFF". Reproduced multivalue printer. Multi-valued pixels can be reproduced by, for example, adjusting the size of dots formed at each pixel position. In forming dots of various sizes, a drive signal having a complex waveform is used to enable selective ejection of various amounts of ink. Then, by shaping the driving signal, the ink discharge amount at each pixel position is adjusted. [0003] However, when one type of drive signal is used, the average ink discharge amount per pixel can only be changed in about three steps at most. Therefore, the local tone reproducibility of each pixel is also limite...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N1/40H04N1/405
CPCH04N1/40043H04N1/40087H04N1/4057
Inventor 藤森幸光
Owner SEIKO EPSON CORP
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