1 / 22

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)

kamil
Download Presentation

EET 450 – Advanced Digital

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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.

More Related