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Five Processes of Xerography

Printing

Let's take a look at the five printing processes by xerography, taking a simple document image as an example.

1.Charging2.Exposure3.Development4.Transfer5.Fusing

1.Charging

The entire photoreceptor is negatively charged by delivering negatively-charged ions using a wire with high-voltage.

Photoreceptor a semiconductor which generate positive charges when exposed to light.Xerography uses this characteristic to perform printing.*The above photoreceptor in plate form is provided for the purpose of illustration.Actual color multifunction machines use cylindrical photoreceptors

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2.Exposure

A laser beam according to the image of the original document is irradiated onto the negatively-charged photoreceptor. The irradiated region of the photoreceptor generates positive charges, and negative charges were cancelled out.
A mirror image of the original document image provided by negative charges is formed on the photoreceptor.

?The irradiated region becomes positively charged, canceling out negative charges.

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3.Development

Since toner immediately after transfer is just put on paper, it soon comes off.Accordingly, toner is fixed to prevent it from coming off by applying heat and pressure with a fixing roll to melt toner into paper.
In such a way, toner is permanently bonded on paper and copying is completed.

Negatively charged toner particles/Toner is fixed on the region with no negative charges

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4.Transfer

Positively-charged paper is brought close to the photoreceptor. By using the characteristic that positive charges attract negative charges, negatively-charged toner is absorbed onto paper.
The image of the original document formed by toner is transferred onto paper.

  • *Actual multifunction machines have a transfer roller to perform a transfer by exerting an electrical force from the backside of paper.

Negatively-charged toner is absorbed onto positively-charged paper.

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5.Fusing

Since toner immediately after transfer is just put on paper, it soon comes off.Accordingly, toner is fixed to prevent it from coming off by applying heat and pressure with a fixing roll to melt toner into paper.
In such a way, toner is permanently bonded on paper and copying is completed.

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