Printers Printers The Laser Laser Printer Printers Here are the main components of an laser printer Components of a Laser Printer Components Laser Printer Printers Components of ID: 500689
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Laser Printers
PrintersSlide2
The Laser
Laser
Printer
Printers
Here are the main components of an
laser
printer
Components of
a Laser PrinterSlide3
Components
Laser
Printer
Printers
Components of
a Laser
Printer
Controller circuitry
Photoconducting drum
Charging roller
Laser beamRotating mirrorDeveloper roller
Toner hopper
Belt or roller assembly
Paper tray
Charging wire
Cleaning blade
FuserSlide4
Electric Charge
Laser
Printer
Printers
Balanced atoms
Static Electricity
Static Electricity occurs when electric charge is built up in an insulated object. Since oppositely charged atoms are attracted to each other, then objects with opposite static electricity cling together.
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(Net charge zero)
Deficiency of Electrons
(Net
positive
charge)
Excess of electrons
(Net negative charge)
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-Slide5
The Basics
Laser
Printer
Printers
The Corona Wire
Initially, the photoconducting drum is given a total positive charge by the charge corona wire (or sometimes use a charging roller).
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The Corona Wire
Photoconducting drumSlide6
The Basics
Laser
Printer
Printers
Laser Beam
As the drum revolves, a tiny laser beam is focused across the surface of the drum. The charge on the roller is discharged at certain points, reversing the charge, creating an electrostatic image.
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Photoconducting drum
Laser Beam
Reverses the charge
Positive charge
The Corona Wire
Electrostatic patterned image is setSlide7
The Basics
Laser
Printer
Printers
Toner
After the pattern is set on the drum, the printer coats the drum with positively charged toner (powder). The positively charged toner is attracted to the discharged (negatively charged) areas on the drum.
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Photoconducting drum
Laser Beam
Reverses the charge
Positive charge
Developer roller
The Corona Wire
Toner hopperSlide8
The Basics
Laser
Printer
Printers
Paper
The photoconducting drum now rolls over a sheet of paper, which is moving along a belt below.
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Photoconducting drum
Laser Beam
Reverses the charge
Positive charge
The Corona Wire
Paper
Developer roller
Toner hopper
The Corona WireSlide9
The Basics
Laser
Printer
Printers
Paper: negatively charged
The paper is negatively charged using a corona wire.
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Photoconducting drum
Laser Beam
Reverses the charge
Positive charge
The Corona Wire
Paper
Developer roller
Toner hopper
The Corona Wire
Negative charge
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-Slide10
The Basics
Laser
Printer
Printers
Toner displaced
Toner transferred to paper
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+
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Photoconducting drum
Laser Beam
Reverses the charge
Positive charge
The Corona Wire
Paper
Developer roller
Toner hopper
The Corona Wire
Negative charge
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Positive toner is transferred onto strongly negatively charged paper. The paper is then immediately discharged. Slide11
The Basics
Laser
Printer
Printers
The Fuser
Toner transferred to paper
Heated rollers
Paper
Negative charge
Finally, the paper passes through a pair of heated rollers that melts the loose toner paper, fusing the fibers in the paper.
Melts the loose toner
No negative charge
Melted toner
Powdered toner
(Discharge)Slide12
Laser Printer
Printers
Summary
Data
is transferred, buffered and sent to the printer’s processor.
The photoconducting drum is given a positive charge by a corona wire or a charging drum.
As the drum revolves, a tiny
l
aser beam is focused on the drum, discharging the drum at certain points forming an electrostatic image.
The developer roller coats the drum with positively charged toner. The positively charged toner is attracted towards the discharged areas. The photoconducting drum now rolls over negatively charged paper, attracting the positively charged toner.The paper passes between two heated rollers that melt the powdered toner fusing the fibers in the paper.