UPSC » UPSC CSE Study Materials » Physics » A Brief Note On Printers

A Brief Note On Printers

A printer is a computer device that creates a permanent copy of visuals or text on paper. Bar code printers are just an example of an expanded usage for printers. Printers are important in our lives.

A printer is a piece of hardware that allows you to create hard copies and print any document. A document can be any form of a file, including text, images, or a combination. Users using a computer or even other devices give it information to print papers. If you need to submit a project report to your college, you’ll need to make a soft copy of your report and then print this with the printer. Printers are one of the most prevalent computer peripheral devices, and they are divided into two types: 2D and 3D printers.

What are Printers? 

A printer is a device that takes the text and graphic output from a computer and then converts it to paper, usually standard-size 8.5″ by 11″ sheets. Printers are available in various sizes, speeds, sophistication, and cost. For more frequent printing or high-resolution colour printing, relatively costly printers are typically used. There are two types of personal computer printers: impact but also non-impact. Earlier impact printers functioned similarly to an automatic typewriter, with each printed character being represented by an inked impression upon paper. A popular low-cost option is the dot matrix printer, an impact printer that strikes the paper one line by line. Inkjet or laser printers are mostly well non-impact printing technologies. In contrast, the laser printer uses a laser beam reflected from a mirror to attract ink (called toner) to selected paper areas as it rolls over a drum.

Laser Printer

A laser printer is a personal computer printer that uses non-impact photocopier technology (keys do not strike the paper). When a document is sent to the printer, a laser beam uses electrical charges to “draw” the document on a selenium-coated drum. After the drum has been charged, it is rolled in toner, a dry powder type of ink. The toner sticks to the drum’s charged picture. The toner is applied to a piece of paper and fused to it using pressure and heat. The electrical charge just on the drum is removed once the page is produced, and also the extra toner is gathered. A large percentage of laser printers are monochrome only. Colour laser printers can cost up to ten times as much as monochrome laser printers.

In several aspects, a laser printer differs from an inkjet printer. A laser printer’s toner and ink are dry. It’s wet in an inkjet. Although ink needs to be replaced more regularly, an inkjet printer is around ten times more expensive to operate over time than a laser printer. An inkjet printer’s printed paper will smear if it gets wet, but a laser-produced document will not. These types of printers are silent & enabled for the addition of fonts through font cartridges or the installation of soft fonts. 

Laser Printer Components

A modern laser printer comprises eight basic components essential to achieving the high print quality we’ve come to expect. The following are the parts of a printer’s anatomy:

Power supply

Since charging the drum requires a high voltage, the power supply converts AC into the higher voltages needed for the transfer process.

Photosensitive drum

The drum unit’s job is to attract positively charged toner particles to the surface of the drum. Laser printers typically use a corona wire, which carries a high voltage, to do this. After the drum has been sufficiently charged, the laser beam is steered onto the drum’s surface using mirrors that precisely scan the images onto the drum’s surface.

Toner cartridges

Toner is a powdered form of microscopic ink particles used by laser printers. The toner melts when heated by the fuser unit, enabling it to be fused to the paper fibres under pressure.

Toner, like inkjet cartridges, has been most typically used during CMYK colour schemes. These colours could be mixed to create any colour scheme.

Corona wires

The primary corona wire is in charge of positively charging the drum unit so it can attract toner particles to its surface. The transfer corona wire is given a negative charge to negatively charge the paper, thus attracting toner particles from the drum’s surface onto the sheet. High voltages are required for each of these wires to provide an appropriate charge supplied by the high voltage power source.


Printing technology seems to be more accessible than it has ever been. The printing world is continually evolving, from small, portable mobile printers to giant wide format printers to high-tech multipurpose printers. There are several types of laser printers and colour laser printers today, but laser and inkjet printers are the most common by far. Printers become faster, easier to use, and more reliable every day. Your company may use digital presses for high-volume printing or production print machines for many types of jobs. 3D print technology is also advancing at a breakneck pace, with the potential to save lives in the future via organ printing.


Frequently asked questions

Get answers to the most common queries related to the NEET UG Examination Preparation.

What is the process of using a colour laser printer?

Ans. Toner is a powdered form of microscopic ink particles used by c...Read full

What exactly does a printer explain?

Ans. A printer, often known as a computer printer, is an electronic device tha...Read full

Explain printers and types?

Ans. Printers are one of the most prevalent computer peripheral devices, and they are divided into two types: 2D and...Read full

What are the two most common printer types?

Ans. Inkjet printers and laser printers are the most common types of printers....Read full