At dpi, there are 90, dots per square inch dots per linear inch. In a commercial environment such as an officeit is becoming increasingly common for businesses to use external software that increases the performance and efficiency of laser printers in the workplace.
Static discharge from charged toner particles can ignite combustible particles in a vacuum cleaner bag or create a small dust explosion if sufficient toner is airborne.
The white hexagon is the rotating scanner mirror. To permit a high registration accuracy, some color laser printers use a large rotating belt called a "transfer belt".
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.
This permits the use of a very small and compact unit, where the photoreceptor is charged, rotates a few degrees and is scanned, Jet copier simulation a few more degrees and is developed, and so forth. Jet copier simulation the fuser roller does not reach a high enough temperature or if the ambient humidity is too high, the toner will not fuse well to the paper and may flake off after printing.
The drum then transfers the image onto paper which is passed through the machine by direct contact.
Software can be used to set rules dictating how employees interact with printers, such as setting limits on how many pages can be printed per day, limiting usage of color ink, and flagging jobs that appear to be wasteful. A radiant heat lamp is suspended in the centre of the hollow tube, and its infrared energy uniformly heats the roller from the inside.
Safety hazards, health risks, and precautions[ edit ] Toner clean-up[ edit ] Toner particles are formulated to have electrostatic properties and can develop static electric charges when they rub against other particles, objects, or the interiors of transport systems and vacuum hoses.
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.
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.
The fastest color laser printers can print over pages per minute pages per hour. Color printers usually have a higher cost per page than monochrome printers even if printing monochrome-only pages.
Toner consists of fine particles of dry plastic powder mixed with carbon black or coloring agents. Because negative charges repel each other, the negatively charged toner particles will not adhere to the drum where the negative charge imparted previously by the charge roller remains.
Some machines also use a positively charged "transfer roller" on the back side of the paper to help pull the negatively charged toner from the photoreceptor drum to the paper. Inkjet printers designed for printing photos can produce much higher quality color images.
Cleaning and recharging[ edit ] Magnification of color laser printer output, showing individual toner particles comprising 4 dots of an image with a bluish background As the drum completes a revolution, it is exposed to an electrically neutral soft plastic blade which cleans any remaining toner from the photoreceptor drum and deposits it into a waste reservoir.Liens externes (en) Site officiel (en) Les Bio-Teens sur l’ Internet Movie Database Les Bio-Teens sur Allociné.
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