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LASER PRINTERS

BY SUHANEE GIROTI

WHAT IS A LASER PRINTER

It is a printer that makes use of powdered ink and stat...

It is a printer that makes use of powdered ink and static electricity to print

- They use powdered ink instead of liquid ink to print

- They use static electricity to print characters and images

- They print the whole page in one go

- They are suitable for large print jobs since they have a high speed advantage

The main components of a laser printer

The main components of a laser printer

Laser printers primarily consist of:

Logic circuits

Photosensitive drum

Laser

Toner Hopper (location of powdered ink)

Fuser (melts the ink)

Erase lamp.

Photosensitive drum

Photosensitive Drum

This aluminum cylinder saves the image of what you are printing

HOW IT WORKS

1. THE DATA FROM THE FILE TO BE PRINTED IS SENT TO A PRINTER DRIVER

2. THE PRINTER DRIVER CHECKS THAT THE DATA IS IN UNDERSTANDABLE FORMAT

2. THE PRINTER DRIVER CHECKS THAT THE DATA IS ...

3. THE PRINTER DRIVER CHECKS IF THE PRINTER IS ABLE TO CARRY OUT THE TASK

4. THE DATA IS SENT TO THE PRINTER AND IS STORED IN A PRINTER BUFFER

4. THE DATA IS SENT TO THE PRINTER AND IS STORED IN...

5. THE PRINTING DRUM IS GIVEN A POSITIVE CHARGE

6. THE LASER BEAM REMOVES THIS POSITIVE CHARGE IN CERTAIN AREAS: THIS LEAVES CERTAIN NEGATIVELY CHARGED AREAS IN THE SHAPE OF THE IMAGE TO BE PRINTED

6. THE LASER BEAM REMOVES THIS POSITIVE CHARGE ...

7. THE DRUM IS COVERED IN POSITIVELY CHARGED TONER. THIS STICKS TO THE NEGATIVELY CHARGED PARTS OF THE DRUM

7. THE DRUM IS COVERED IN POSITIVELY CHARGED TONER. THIS STICKS TO THE NEGATIVELY CHARG...

8. A NEGATIVELY CHARGED PAPER IS THEN ROLLED OVER T...

8. A NEGATIVELY CHARGED PAPER IS THEN ROLLED OVER THE DRUM. THIS NEGATIVE CHARGE IS STRONGER THAN THE ONE ON THE DRUM, CAUSING THE TONER TO STICK TO THE PAPER

9. THE NEGATIVE CHARGE IS REMOV...

9. THE NEGATIVE CHARGE IS REMOVED FROM THE PAPER TO PREVENT IT FROM STCKING TO THE DRUM

10. THE PAPER GOES THROUGH A FUSER. THIS MELTS THE INK ONTO THE PAPER

11. A DISCHARGE LAMP REMOVES ALL THE CHARGE FROM THE DRUM, PREPARING IT FOR THE NEXT JOB

11. A DISCHARGE LAMP REMOVES ALL THE CHARGE FROM THE DRUM, PREPARING IT FOR T...

VIDEO

USES

- By businesses for mass production

- Preparing invoices in large numbers

- Account and corporate statements

- Advertising

- They are not usually used in homes due to their high price

Comparison with Ink-jet printer

laser printer

ink-jet printer

Comparison with Ink-jet printer

- It uses a type of powdered ink called toner, which sticks to the paper

Advantage: offers high quality, faster thank ink jet, efficient use of toner

Disadvantage: maintanence is expensive, produce ozone matter which may be harmful, larger in size, can be noisy

- works through spraying minute dots of ink onto paper

Advantage: smaller in size, cheaper than laser printers, high quality even in coloured ink

Disadvantage: slower than laser printers, the ink cartridges have to be replaced frequently, ink can smudge if touched early, expensive to run

VIDEO

QUIZ

Q1. Give two reasons why Laser Printers should be used over InkJet printers

Q2. What is the toner and where is it stored?

Q3. The Laser printer uses the static electricity and liquid ink to print (T/F)

Q4. Briefly explain the involvement of charges in the printing process.

RESOURCES

- http://support.brother.com/g/b/faqendbranchprintable.aspx?c=us&lang=en&prod=hl7050_all&faqid=faq00002882_000&printable=true

-https://www.slideshare.net/AbhijitJadhav9/laser-printers-69559771

- https://www.quora.com/What-are-laser-printers-used-for

- http://www.bbc.co.uk/schools/gcsebitesize/dida/graphics/printingrev2.shtml

- PREZI.COM

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