The First and important from technological innovation - a transition on printer architectures, basing on use resource leading PC. Earlier in printing device for shaping taken out on seal the scene, as a rule, were used languages of management printer. The Lazer printers subdevided on two categories: running under PCL (Printer Control Language - a language of management printer) to companies Hewlett-Packard and PostScript company Adobe. In jet printer was used basically language PCL or one of the standard command languages for matrix printer (such, as emulators mode Epson and IBM).

The Advantage of such approach consists in that that computer sends relatively compact instructions in controller of the printer, but controller will then convert them in scene on page. Thereby, issue by system it is enough complex pages occurs by leaps and bounds; while controller of the printer by occupied intensive quick-and-dirty work (formatting the scene), computer can return to execution of the other problems. The Defect - a functions of the controller can execute only more perfect микрокомпьютер with powerful processor and big volume to memories. The Velocity under colour seal, as a rule, vastly lower, when printing by one black colour.

While personal computers were not united between itself, seal did not cause the difficulties. Or printer was connected to your computer, or you carried its file, in whose that computer with connected by printer. But as soon as users have begun to work with the general file in network, they have wanted also to have and the general printers. And such printers appeared.

The Heart of the lazer printer is фотопроводящий cylinder (organic photoconduction cartridge), which often name the printing drum. By means of drum is produced carrying the scene on paper. He presents itself metallic cylinder, coated by fine film фотопроводящего semiconductor, usually oxides of the zinc or than-or like. The Surfaces of this covering possible to add positive or negative charge, which is saved on surfaces, but only until drum not lit. If what or a part of drum проэкспонировать, that covering gains the conductivity and charge стечет with illuminated area, having formed unloaded zone. The Givenned moment very important for understanding the principle of the functioning(working) the lazer printer. The Following important his(its) part is a lazer and презиционно optometrist-mechanical system, moving ray.

The Small-dimensioned lazer generates the fine light ray, reflecting from revolvinging mirrors (as a rule, шестигранного) discharges positively charged surface of the drum. To was got scene, lazer is included and switched off controlling microcontroller. The Revolvinging mirror unwinds the ray in line on surfaces printing drum. All this together creates on his(its) surfaces line hidden scene, in which that area, which must be black, have one charge, but white opposite. After shaping the line of the scene, special презиционный crossbar engine turns the drum so that possible was form the necessary line. This offset is equal the allowing abilities of the printer and usually forms 1/300,1/600 inches. This stage of the print reminds the building of the scene on screen of the television monitor.

But what image charge appears on surfaces of the drum, required for making the scene? For this serves the fine wire or net, named "коронирующим wire". But why "коронирующий"? This is because on this wire is given high power, causing arising the luminous ionized area around it, which and is identified the corona and will add the drum necessary steady-state charge.
The Ithaca, on drum is formed scene like steady-state charge and unloaded area. That further? Further, the drum goes by platen, giving from special container black colorific powder toner. The Small parts of the toner, charged positively, adhere to neutral area only, repulsing from positively charged. This looks like that, as dust is going to on screen of the television set.

The Small remark: here goes the speech about printer of the type Hewlett Packard LazerJet. However exists and the other method of the imaging. He is used in printer Epson and other like, using engine of the company Ricon. The area run down In these printer, which must be white. In this case toner, charged is negativly attracted to positively charged area of the drum. The Imprint made on such printer, have hardly perceptible differences as: when use the first way is reached transmission of the details, but when work with the second more qualitative black areas. The Following stage is a carrying the toner (but, signifies, and scenes) on paper. The Paper is extended from giving pallet and by means of systems platen moves to printing drum. Before most drum to paper communicates the statistical charge by means of one more коронирующего wire, like that that is used for preparing the drum to экспонированию. Then, the paper snuggles to surfaces of the drum. The Charges to polarity miscellaneous, dug on surfaces of the paper and on surfaces of the drum, cause carrying the particles of the toner on paper and their reliable adhesion to the last. After carrying the toner paper abandons the surface of the drum.

At, the platens continue to move the paper to output pallet of the printer. The Following section of the printer, meeting paper with scene on this way, is an element фиксации scenes. The Toner contains the material, capable easy melts. Usually this some polymer or resin. When heating before 200-220 degrees and increasing of the pressure powder is melted and firmly unites with surface of the paper. Right before вышедшие from printer sheets warm, but too impatient user, being enough appeared slip, risks to burn the finger.

Hereinafter paper is dragged to output pallet. Herewith if sheets are removed stright, upper last sheet turns out to be in foot imprint. Many printers, however, turn over the paper by person downwards, packing foot in correct order that is to say upper will be a first sheet, lower last.

The Imprint ready, remained not considered last important position clearing the drum. When carrying the scene on paper not all small parts of the toner adhere to her, and small quantity their remains on drum. For this on he is given electric charge, drum is cleaned and ready to print the following sheet.

Important is a device of control, as a rule, microcontroller on the base of the microprocessor. The Controller services the ports, operative memory, realizes the diagnostics of the printer, gives the messages on panel of control, emulates the different standards of the connection and, certainly, gives the groups of ten a signal, controlling all elements of the printer.
The Material by means of which printer creates the scene a TONER is identified on paper. The Toner-certain material (most often him are or polymer, or resin) in powdery condition. Modern technology of the fabrication of the toner so developed in recent years that on blade of the razor possible to place before 3 particles of the toner.

The Monochrome lazer printers use only black toner, but colour four colours (black, red, green and blue) and is sewn on them in determined proportions on paper, get the certain colour or tone.

The Toner is kept in special картриджах and (depending on type of the printer) one картриджа is enough from 2000 before 20000 pages (for monochrome print) and from 3000 before 6500 pages (for colour). In this connection the last modern printers are delivered with compartment for two картриджей immediately but some also give information on amount remained toner in them.

Author: А. V. Savin It Is Added: 03.05.2007