What is a xerography process?

What is a xerography process?

Xerography, also known as electrophotography, is a printing and photocopying technique that works on the basis of electrostatic charges. The xerography process is the dominant method of reproducing images and printing computer data and is used in photocopiers, laser printer s and fax machines.

What are the major steps of processing of charging in xerography?

Printing

• Charging. The entire photoreceptor is negatively charged by delivering negatively-charged ions using a wire with high-voltage.
• Exposure. A laser beam according to the image of the original document is irradiated onto the negatively-charged photoreceptor.
• 3.Development.
• Transfer.

What are the 3 types of electrophotography?

Electrophotography, also called xerography, is the primary technique used in photocopiers and laser printers. This is the most commonly used toner printing system. Others include ion deposition (ionography), electrostatic, magnetographic (magnetography), and electrographic (electrography).

Which modern technology works on xerography process?

Xerography is now used in most photocopying machines and in laser and LED printers.

What are the advantages of xerography?

The advantages of xerography include high resolving power, very rapid controlled development in any colour, over-printing capacity, and low cost.

What is the main difference between xerography and earlier photocopying processes?

A process somewhat similar to that used in xerography is electrostatic copying. The major difference between these two processes is that in electrostatic copying, the endless photoconducting surface is omitted from the machine and the copy paper is specially treated to pick up the toner.

Why is selenium used in xerography?

Selenium is used because it is able to hold and conduct charges in the absence and presence of light. Once the photo-conductor is charged a document begins to pass over the rotating drum. In most printing devices a laser is used to illuminate the document which projects an image onto the drum.

Who invented xerography?

Chester Carlson
Rasmus Malling-HansenPál Selényi
Xerography/Inventors

What is the role of selenium in xerography?

What is xerography machine?

xerography, Image-forming process that relies on a photoconductive substance whose electrical resistance decreases when light falls on it. Xerography is the basis of the most widely used document-copying machines (see photocopier).

How electrostatic is used in xerography?

The basic xerography process makes uses of electrostatic charge to create the image, to then use light from the image to remove charge selectively, and then apply a toner to the remnant charge. The toner must be fixed to the paper using a thermal process.

What are the process of printing?

Each printing process is divided into prepress, press, and postpress steps. Prepress operations encompass steps during which the idea for a printed image is converted into an image carrier such as a plate, cylinder, or screen.

Why was the xerography made?

It is the text of the first xerographic image ever fashioned. It was created in a makeshift laboratory in Queens, NY. by a patent attorney named Chester Carlson, who believed that the world was ready for an easier and less costly way to make copies.

What are the four printing processes?

The main industrial printing processes are:

• Offset lithography.
• Flexography.
• Digital printing: inkjet & xerography.
• Gravure.
• Screen printing.

How many types of printing processes are used?

When it comes to professional printing processes there are three main types: Offset litho printing. Digital Printing. Screen printing.

Who has invented xerography?

What is the basic xerography process?

The basic xerography process makes uses of electrostatic charge to create the image, to then use light from the image to remove charge selectively, and then apply a toner to the remnant charge. The toner must be fixed to the paper using a thermal process. Figure 18.6. Printing/copying machine.

What is the difference between xerography and electrophotography?

“Electrophotography” redirects here. For the photographic technique, see Kirlian photography. Xerography is a dry photocopying technique.

What is the difference between direct xerography and image transfer?

In direct xerography, the P/R is factory-coated onto the image substrate, usually paper, and remains there after imaging. There is no requirement for image transfer or P/R cleaning and recycling, which significantly reduces the mechanical complexity of the copier.

How does a xerographic copier work?

As a sheet of paper is passed close to the drum, a positive electric charge under the sheet attracts the negatively charged ink particles, transferring the image to the copy paper. Heat briefly applied fuses the ink particles to the paper. The first commercially successful xerographic copier was introduced in 1959.