What is the electrophotographic process?

An electrophotographic printer consists of six processes: charging, exposure, developing, transfer, fusing and cleaning1. For printing, charged toner, which is a coloring agent, is selectively transferred to the recording paper primarily by static electricity.

What is electrophotographic drum?

Electrophotographic definition It uses electrostatic charges, dry ink (toner) and light. A selenium-coated, photoconductive drum is positively charged. Using a laser or LEDs, a negative of the image is beamed onto the drum, cancelling the charge and leaving a positively charged replica of the original image.

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).

Is LED printer better than laser?

Today there’s no real difference between laser and LED in terms of image quality, but with fewer moving parts, LED printers have the potential to be faster, cheaper and more reliable.

How does a corotron work?

A strong electric field forms between the wire and the walls of the corotron. The electric field lines also extend to the surface of the photoreceptor. Free ions that are normally present in air are attracted to the wire while the free electrons are repelled from the wire.

How does xerography work?

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). The process was invented in the 1930s by U.S. physicist Chester F.

Who invented xerography?

Chester Carlson
Pál Selényi

What are three disadvantages of impact printers?


  • The output is not high resolution.
  • The printer creates great deal of noise while the pins strike the ribbon to the paper.
  • The pins get bended easily destroying the print head.
  • The single sheet of paper has to wound and aligned by hand which is time-consuming and hectic.

What are common uses of electrophotography?

Electrophotography is commonly used in photocopying machines and certain printers, such as LED and laser printers. The copying procedure happens in less than a minute but goes through a five step process each time.

What are the disadvantages of LED printers?

An LED printer does require a higher initial investment than some other styles, but the cost per print is much lower than most other available print technologies. PROs: High quality prints, fast print speeds, low cost per print. CONs: High initial cost, high energy consumption.

What are LED printers used for?

LED printers are available from inexpensive personal printers to huge digital printing presses that print more than 700 pages per minute (ppm). See LED. The LED mechanism is much simpler, because it is a stationary array of light emitting diodes (LEDs) rather than a number of moving parts.

What does the corona wire do?

The corona wire uses static electricity to coat both the photoreceptive drum and the copy paper with a layer of positively charged ions. For a photocopier to work, a field of positive charges must be generated on the surface of both the drum and the copy paper. These tasks are accomplished by the corona wires.

What is electrophotographic printing?

Also known as xerography, electrophotographic printing is an imaging technique wherein a digital file is printed onto a paper via charging, exposure, developing, transfer, fusing and cleaning processes.

What is electrophotography (EP)?

Electrophotography, or EP, is the oldest of the non-impact printing technologies, having been invented in the mid 1930’s by Chester Carlson. Electrophotographic printing is also often referred to as Xerography (meaning dry writing) and/or laser printing.

What are the basic principles of electrophotography?

To understand electrophotography, we must first understand some basic electrostatic principles. When certain materials come in contact then separate from each other, these materials can become electrically charged. Rubbing these materials together can increase this effect. This is called the

What are the advantages of electrophotography?

Photoconductor (Often referred to as the photoreceptor) The principal advantages of Electrophotography, or EP, over other non-impact printing or digital printing technologies are: Excellent print quality for text, graphics, and pictorials Large speed range – products from 4 PPM to 1,000 PPM