Background
description
Transcript of Background
Background• Electrophotographic Printing (EP) test rig
originally from Kodak• P09503 modified for improved usability and
automation• LabView controls implemented for automation• Has station for major steps:
Charging, Exposure, Toner, TransferFusing occurs on a different rig
• Exposure step is performed with a negative. Cannot print file from computer.
• Our Problem: Test pattern cannot be specified from computer
EP Process (Part 1 of 2)
Stepper motor to turn screw to move carriage
Photoconductor carriage
Charging Station Exposure Station
Negative
Screw to move carriage
EP Process (Part 2 of 2)
Transfer drum
Toner StationTransfer Station
Tray for paper
Fusing: On one of several other rigs, heat and pressure are applied to fuse toner to paper.
Stakeholder InterviewsFirst Interview (Dr. Esterman & Alvaro) Second Interview (Alvaro) Prelim Specs
Convert computer file into light output Accepts computer input to specify test pattern
Integrates into current rig (software:LabView and hardware)
Current exposure station has a space of 12" height, 10" along direction of carriage motion, and 15" width
Integrates into LabView softwareFits into 10"x15"x12" available space of current exposure system
Current Stepper motor should be sufficient if moving during exposure is required
Uses current stepper motor if motion is required
High resolution preferred 1200 DPI target; 600 DPI min. Higher is better. 1200*20±1 DPI Resolution
Controls exposure time OR intensity Current exposure step takes a sec or two. Controls exposure time or intensity
Current PC is 5" wide x 9" long Capable of exposing entire PC Exposes a min area of the 5"x9" photoconductor
$2-3k available to accomplish goal, but can potentially get more if required Built within budget ($2-3K)
Powered from wall outlet, or off current 24V supply that powers exposure station and stepper controller
Powered by available sources (wall outlet, current power supply)
Voice of Customer - Needs• Accepts computer input to specify test pattern• Integrates into LabView software• Fits into 10"x15"x12" available space of current exposure system• Uses current stepper motor if motion is required • 1200*20±1 DPI Resolution (1200 DPI target, 600 DPI min)• Controls exposure time or intensity• Exposes a min area of the 5"x9" photoconductor • Built within budget ($2-3K)• Powered by available sources (wall outlet, current power supply)
Moving Forward - Possible Solutions
• Xerox HiQ LED Print Head• Can achieve resolutions of 1200 x
2400 dpi• The LEDS selectively flash to
create a pattern of dots on the photo receptor drum
• Laser Printing assembly• Common laser printers achieve
1200 dpi• Laser scans photo receptor drum
as it rotates, creating the latent image