Printers And Multifunction Devices Flashcards
Printer that creates an image on paper by physically striking an ink ribbon against the paper’s surface. Tend to be slow and noisy but when speed, flexibility, and print quality are not critical, they provide acceptable results
Impact Printer
Essentially an electric typewriter attached to the computer instead of directly to a keyboard; mostly disappeared
Daisy-Wheel Printer
Cousin of daisy-wheel printers; used in businesses. Use a grid of tiny pins (printwires) to strike an inked printer ribbon and produce image on paper
Dot-Matrix Printer
Case that holds printwires
Printhead
9-pin dot-matrix printers
Draft Quality
24-pin dot-matrix printers
Letter Quality/Near-Letter Quality (NLQ)
Printer that uses a printhead connected to a cartridge that contains the ink. A belt and motor move the carriage back and forth so the ink can cover the whole page
Inkjet/Ink-Dispersion Printer
Grabs paper from a paper tray (usually inside or under the printer) or feeder (usually on the back of the printer) and advanced it through the printer
Roller
How densely the printer lays down ink on the page. Measured in horizontal and vertical dots per inch (DPI) where higher numbers mean that the ink dots on the page are closer together, so your printed documents will look better
Print Resolution
Measured in pages per minute (ppm)
Print Speed
Cause something to change from a solid form into a vapor and then back into a solid
Sublimation
Used mainly for photo printing, high-end desktop publishing, medical and scientific imaging, and other applications for which fine detail and rich color are more important than cost and speed
Dye-Sublimation/Thermal Dye Transfer Printing
The printed image is not constructed of pixel dots but a continuous blend of overlaid differing dye colors. Documents printed through the dye-sublimation process display these
Continuous-Tone Images
Use closely packed, single-color dots to stimulate blended colors
Dithered Images
Printer that uses a heated printhead to create a high-quality image on special or plain paper
Thermal Printer
Use a heating element to burn dots into the surface of special heat-sensitive thermal paper. Examples: first generation fax machines, receipt paper
Direct-Thermal Printer
Work similarly yo dye-sublimation printers, except that instead of using rolls of dye-embedded film, the film is coated with colored wax. Doesn’t require special paper like dye-sublimation ones do
Thermal Wax Transfer Printer
Printer that uses a process called electro-photographic imaging to produce high-quality and high-speed output of both text and graphics. Rely on the photoconductive (particles of these compounds when exposed to light will conduct electricity) properties of certain organic compounds
Laser Printer
Supplies the toner that creates the image on the page in a laser printer. To reduce maintenance costs, many other laser printer parts, especially those that suffer the most wear and tear, have been incorporated into it
Toner Cartridge
An aluminum cylinder coated with particles of photosensitive compounds. Drum is grounded to the power supply, but the coating is not. When light hits these particles, whatever electrical charge they may have “drains” out throughout the grounded cylinder
Imaging/Photosensitive Drum
Exposes the entire surface of the imaging drum to light, making the photosensitive coating conductive
Erase Lamp
Located close to the photosensitive drum, never touches the drum. When it is charged with an extremely high voltage, an electrical (corona) forms, enabling voltage to pass to the drum and charge the photosensitive particles on its surface. The primary grid regulates the transfer of voltage, ensuring that the surface of the drum receives a uniform negative voltage of between 600 and 1000 volts
Primary Corona Wire/Charge Roller
The writing mechanism of the printer. Writes a positive image to the drum
Laser
In a laser printer, is a fine powder made up of plastic particles bonded to pigment particles. Particles of it are attracted to the areas of the photosensitive drum that have been hit by the laser
Toner
In older printers, a thin wire applies positive charge to the paper, drawing the negatively charged toner particles to the paper
Transfer Corona
In newer printers, accomplishes the same feat as transfer corona that draws the the toner onto the paper. The paper, with its positive charge, is also attracted to the negatively charged drum
Transfer Roller
Removes the charge from the paper preventing it from wrapping around the drum
Static Charge Eliminator
Most are located outside the toner cartridge, especially in large, commercial-grade machines. Prone to a build-up of dirt, toner, and debris through electrostatic attraction, and it must be cleaned. Quite fragile - usually finer than a human hair
Transfer Corona/Roller
Almost always separate from the toner cartridge. Usually close to the bottom of the toner cartridge and has two rollers to fuse the toner
Fuser Assembly
Uses friction to separate a single sheet from any others that were picked up
Separation Pad
Reverses the paper allowing for printing on both sides
Duplexing Assembly
Printer that uses melted material to create prints of 3D objects. Most commonly uses plastic filament on spools. Also need manual connection of the plastic filament(s) to the print device
3D Printer
Program that converts the output from your computer into a specific format and saves the result to a portable file that looks like the printed page would have
Virtual Printer
Contains a variety of control codes for transferring data, some of which can be used to control printers
American Standard Code for Information Interchange (ASCII)
Page description language developed by Adobe Systems as a device-independent printer language capable of high-resolution graphics and scalable fonts. Because it is understood by printers and not the computer’s CPU so they print faster. Sees a page as a single raster image
PostScript
Features a set of printer commands greatly expanded from ASCII. Designed with text-based output in mind; doesn’t support advanced graphical functions. Not a true page description language; uses a series of commands to define the characters on the page
HP Printed Command Language (PCL)
Windows uses this component of the OS to handle print functions. Uses the CPU rather than the printer to process a print job and then sends the completed job to the printer
Graphical Device Interface (GDI)
Print path introduced by Windows Vista a new printing subsystem. Provide several improvements over GDI, including enhanced color management and better print layout fidelity
XML Paper Specifications (XPS)
Most common variety of scanner. Place a photo or other object face down on the glass/platen, close the lid, and then use software to initiate the scan. The scanner runs a bright light along the length of the platen once or more to capture the image
Flatbed Scanners
The resolution a scanner achieves mechanically
Optical Resolution
Define the number of bits of information the scanner can use to describe each individual pixel. Determines color, shade, hue, and so forth. 24-bit and 48-bit common
Color Depth
A number that defines how many shades of gray the scanner can save per pixel. 8-bit, 12-bit, and 16-bit common
Grayscale Depth
Used by a multifunction device to grab pages to copy, scan, or fax. It is typically on top of a multifunction device and you place a stack of pages in the tray
Automatic Document Feeder (ADF)
Standalone network device that connects a printer to the network but may not be able to use all of the features of the multifunction device
Print Server
Print server in a router
Integrated Print Server
Enables you to queue up multiple print jobs that the printer will handle sequentially
Print Spooler
A pattern of dots
Raster Image
A chip that laser printers use to translate the raster image into commands to the laser. Needs RAM to store the data that it must process
Raster Image Processor (RIP)
Enables the printer to insert smaller dots among the characters, smoothing out the jagged curves that are typical of printers that don’t use it. Requires RAM
Resolution Enhancement Technology (RET)
Using a substitute printer driver for a printer, as opposed to using one made exclusively for that printer
Printer Emulation
Uses hardware to generate an International Color Consortium (ICC) color profile, a file that defines the color characteristics of a hardware device
Color Calibration
