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Here we examine the basic processes performed by konicaminolta's colour copiers.
(1) Scanning the original
White light is shined on the original, which has been set on the scanning bed. Filters are used to separate
the reflected light into
blue (B), green (G), and red (R), and CCD sensors convert the filtered light into electrical signals.
These image signals are sent to the brain (computer) of the copier, where they are converted into colour data.
(2) Developing
Based on the image signals sent from the scanner, an invisible image, is formed on each of four photo conductor drums.
The process by which toner affixes to the drums to create the images formed there is referred to as developing.
A colour copier uses four colours of toner for development: the three primary colours of pigment, yellow (Y), magenta (M), and cyan (C),
plus black (Bk). It is possible to reproduce black by mixing the three primary
colours of pigment only, but employing black toner as well results in improved reproduction
of black. At this point, the photo conductor drums are like stamps with ink
on them. The next step is to transfer the ink (toner) to the paper.
(3) Image transfer
The image created in the developing process is copied to the paper in the image transfer step.
Toner is applied to an intermediate transfer medium called the transfer belt in the sequence yellow, magenta, cyan, black.
Once the colour image is complete, it is transferred to the paper.
(4) Fixing
After being transferred to the paper, the four colours of toner are merely lightly stuck in place.
One good puff of breath is sufficient to blow them off.
In the fixing step, the toner, which consists of minute particles of plastic, is melted using heat.
Then pressure is applied to fix it firmly to the paper.
This process is called Fixing, and it results in the image being permanently affixed to the
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The Three Primary Colours of Pigment |
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| The three primary colours of pigment are yellow (Y),
magenta (M), and cyan (C). Mixing these three colours equally produces
black. Examples of reproducing colours by mixing the three primary
colours of pigment are colour copiers and colour printers. |
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Reproduction of Black |
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| Colour copiers and colour printers use the three primary
colours of pigment (yellow, magenta, and cyan) to reproduce colours.
Theoretically, it should be possible to reproduce black as well by
mixing the three primary colours. In practice, however, a perfect black
cannot be achieved due to the properties of the pigments. For this
reason, black pigment is used in addition to yellow, magenta, and cyan
to provide improved reproduction of black areas. |
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