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Non Impact Printer
Introduction
The modern xerographic process used today was pioneered by Chester Carlson
Chester Carlson developed the first mass produced office copier with the Haloid Company, which later became Xerox.
The first xerographic image
1938 Chester Carlson made the prototype photocopier
First commercial photocopier
5
Cost per Page
$0.00
$0.20
$0.40
$0.60
$0.80
$1.00
1992
1996
1998
1999
2000
2001
Year
Uni
ts Color LPColor IJ
HP Printer Cost Comparison
$0
$500
$1,000
$1,500
$2,000
$2,500
$3,000
$3,500
$4,000
$4,500
1992 1994 1996 1998 2000 2002 2004 2006
Monochrome
Color
6
Laser Printers
• Interaction of mechanical, electrical and optical technologies
• Use toner, a dry, powdered electrically charged ink
• Performs various steps in printing process
Non Impact Printer
How its works?
Cleaning
The Six Stages of Operation in a Laser Printer include:
Conditioning
Writing
Developing
Transferring
Fusing
Six Steps of Laser Printing
1. Cleaning
2. Conditioning
3. Writing
4. Developing
5. Transferring
6. Fusing
Take place inside toner cartridge
12
How a Laser Printer Works
• Cleaning
Drum is cleaned of residual toner and electric charge
• Conditioning
Drum is conditioned to contain high electrical charge
• Writing
A laser beam discharges a lower charge only to places where toner should go
13
How a Laser Printer Works
• Developing Toner is placed on the drum where charge has been
reduced
• Transferring Strong electrical charge draws toner off the drum onto the
paper
Takes place off the drum
• Fusing Heat and pressure fuse toner to the paper
Step 1: Cleaning
• The drum is cleaned of any residual toner and electrical charge
Step 2: Conditioning
The drum is conditioned to contain a high electrical charge. This drum assembly is made out of highly photoconductive material that is discharged by light photons.
As the drum revolves, the printer shines a tiny laser beam across the surface to positively charge certain points. In this way, the laser "draws" the letters and images to be printed as a pattern of electrical charges , an electrostatic image.
Step 3: Writing
Step 3: Writing
• Data from PC is received by formatter (1) and passed to DC controller (2) which controls laser unit (3)
• Scanning mirror (4) is turned clockwise by scanning motor
• Laser beam is reflected off scanning mirror, focused by focusing lens (5) and sent to the mirror (6)
• Mirror deflects laser beam to a slit in the removable cartridge and on to the drum (7)