Inkjet[ edit ] Inkjet printers are not capable of printing white. So, anywhere that the image requires white, the garment's existing colour shows through.
Diagram of a laser printer The sound of a laser printer A laser beam typically, an aluminium gallium arsenide AlGaAs semiconductor laser projects an image of the page to be printed onto an electrically charged, selenium -coated, rotating, cylindrical drum  or, more commonly in subsequent versions, a drum called an organic photoconductor made of N-vinylcarbazolean organic monomer.
Photoconductivity allows the charged electrons to fall away from the areas exposed to light. Powdered ink toner particles are then electrostatically attracted to the charged areas of the drum that have not been laser-beamed. The drum then transfers the image onto paper which is passed through the machine by direct contact.
There are typically seven steps involved in the process: The raster image processor converts the page description into a bitmap which is stored in the printer's raster memory.
Each horizontal strip of dots across the page is known as a raster line or scan line. Laser printing differs from other printing technologies in that each page is always rendered in a single continuous process without any pausing in the middle, while other technologies like inkjet can pause every few lines.
To avoid a buffer underrun where the laser reaches a point on the page before it has the dots to draw therea laser printer typically needs enough raster memory to hold the bitmap image of an entire page.
Memory requirements increase with the square of the dots per inchso dpi requires a minimum of 4 megabytes for monochrome, and 16 megabytes for color still at dpi.
At dpi, there are 90, dots per square inch dots per linear inch. In a color printer, each of the four CMYK toner layers is stored as a separate bitmap, and all four layers are typically preprocessed before printing begins, so a minimum of 4 megabytes is needed for a full-color letter-size page at dpi.
During the s, memory chips were still very expensive, which is why entry-level laser printers in that era always came with four-digit suggested retail prices in US dollars. Memory prices later plunged, and dpi printers have been widely available in the consumer market since Charging[ edit ] Applying a negative charge to the photosensitive drum In older printers, a corona wire positioned parallel to the drum or, in more recent printers, a primary charge roller, projects an electrostatic charge onto the photoreceptor otherwise named the photo conductor unita revolving photosensitive drum or belt, which is capable of holding an electrostatic charge on its surface while it is in the dark.
An AC bias voltage is applied to the primary charge roller to remove any residual charges left by previous images. The roller will also apply a DC bias on the drum surface to ensure a uniform negative potential. Numerous patents[ specify ] describe the photosensitive drum coating as a silicon sandwich with a photocharging layer, a charge leakage barrier layer, as well as a surface layer.
One version[ specify ] uses amorphous silicon containing hydrogen as the light receiving layer, Boron nitride as a charge leakage barrier layer, as well as a surface layer of doped siliconnotably silicon with oxygen or nitrogen which at sufficient concentration resembles machining silicon nitride.
Laser light selectively neutralizes the negative charge on the photoreceptive drum, to form an electrostatic image Laser unit from a Dell P The white hexagon is the rotating scanner mirror.
A laser printer uses a laser because lasers are able to form highly focused, precise, and intense beams of light, especially over the short distances inside of a printer. The laser is aimed at a rotating polygonal mirror which directs the light beam through a system of lenses and mirrors onto the photoreceptor drum, writing pixels at rates up to sixty five million times per second.
The stream of rasterized data held in the printer's memory rapidly turns the laser on and off as it sweeps. The laser beam neutralizes or reverses the charge on the surface of the drum, leaving a static electric negative image on the drum's surface which will repel the negatively charged toner particles.Use a slightly warm iron to transfer images of pencil drawings, newsprint and freshly printed ink jet and laser print images Turn your most treasured sketch into a stamp $ FOREVER Flex-Soft laser heat transfers are produced with a 2-Layer-System, utilising an A-Film Coloured film, B-Paper Opaque White Adhesive Paper, heat press and a sheet fed A3/A4 laser.
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