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EET 450 – Advanced Digital

EET 450 – Advanced Digital. Printers, Plotters and other hard copy output devices. Printers. The object is to get ‘hard copy’ output from the computer Output is in a variety of forms Letters/numbers Graphics. Printers. The competition is speed versus quality (and price)

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EET 450 – Advanced Digital

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  1. EET 450 – Advanced Digital Printers, Plotters and other hard copy output devices

  2. Printers • The object is to get ‘hard copy’ output from the computer • Output is in a variety of forms • Letters/numbers • Graphics

  3. Printers • The competition is speed versus quality (and price) • Speed determined by Characters per Second (cps) or Pages per Minute (ppm) • Quality is measured by a variety of factors • Dots per inch (dpi) • ‘Letter Quality’

  4. Printing Engines • Historically, printers were fabricated from typewriter mechanisms • Dot Matrix • Characters are constructed using ‘dots’ of ink or other marks • Typically a 5x7 matrix at least

  5. Printing Engines • ‘Letter Quality’ • Originally used to describe output of the quality of a professional letter • Impact LQ printers use ‘Letter at once’ technology • Laser and Ink Jet printers now have high enough quality to be determined as LQ

  6. Printing Engines • Line Printer • Prints an entire line of print at one time • Used for ‘High Volume’ output • Color versus Monochrome • Available in each of the above technologies +

  7. Printer types • Impact Dot Matrix • Uses a set of magnet actuated wires (pins) which strike a ribbon, leaving the imprint of the character as an array of dots • Ribbons may be in a variety of (primary) colors, allowing color output.

  8. Printer types • Ink Jet (dot matrix) • Thermal Inkjet – uses pigment bearing ink heated to steam – which is emitted to form characters • Piezo Inkjet – uses piezo crystal actuator to ‘spray’ a liquid ink

  9. Printer types • Phase Change Inkjet – wax based inks • Electrostatic Inkjet – ink droplets are charged/propelled by electrostatics • Thermal & electrostatic Printers • Use thermally reactive paper darkens when a very small heating element is activated • Electrostatic discharge into coated paper, burns dots into the surface of electrostatic printers

  10. Printer types • Laser printers • Image is ‘written’ using a laser LED, onto an electro statically charged surface • A powdered, pigment bearing, ‘toner’ is adhered to the surface by the charge • The image is transferred to paper, by pressing the powdered image to the surface • The powdered toner is fused (heated) to the paper by a heating element, at the same time it is pressed into the surface of the paper. • Voila

  11. Laser Printer

  12. Printer Types • Thermal Transfer • Pigment is carried on a ribbon, and melted to the paper by an element – a form of DM • Dye Diffusion/Dye sublimation • High quality – photo output • Similar to thermal transfer, but using penetrating dyes

  13. Paper handling • Sheet Feeders • Most printers now use some form of cut sheet feeder to supply paper to the mechanism • Friction feed/continuous paper • Use a roller, pressing into the platten to feed a continuous roll of paper • Not very accurate

  14. Paper handling • Pin Feed • Generally describes a set of pins, at the sides of the platten • Requires ‘tractor feed’ paper • Tractor Feed • Using the holes in ‘tractor feed’ paper, PULLS the paper from the head area or pushes the paper into the head area

  15. Paper handling • Duplex printing • Usually only available in laser printers • A complex mechanical mechanism, reverses the paper from output back to feed into the printer. • Both sides of the paper are used • Form feeders • Alternate paper bins • Envelope feeders

  16. Consummables • Ink • Inkjet cartridges • Refilling • Ribbons • Laser printers • Toner cartridge

  17. Paper • Quality of paper is measured by • Weight - pounds per 500 sheet ream of uncut C size paper • Or per 2000 8.5”x11” sheets • Brightness • Ie 84 - % of light reflected from the surface

  18. Papers • Coating/specialty papers • High quality – photo quality • Canvas/other surfaces • Transparencies • Cloth • Card stock, etc.

  19. Plotters • Uses x-y control to move paper/pen • Draws the image using vectors

  20. Other output devices • Photo plot • Photo film image created through projected light

  21. Other output devices • 3D – output • Photo lithography • Rapid prototyping technique • UV Curable resin used to ‘build’ a 3 dimensional image • Milling • Material is removed to leave the 3D image • CAD

  22. Exam • A short review next Tuesday • Although not scheduled yet, I thought it would be good to scare the bejesus out of everyone by bringing it up.

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