Laser printer printing principle. The world of pc peripherals. Basic inkjet technologies

Today I want to talk about device and principle of operation of a laser printer... Everyone is familiar with this device, but few people know about the principle of its operation and the reasons for its malfunctions. In this article I will try to illustrate the principle of operation of "lasers", and in subsequent articles about the malfunctions of laser printers, the reason for their occurrence, and the way to eliminate them.

Laser printer device

At the heart of any modern laser printer is photoelectricprinciple xerography... Based on this method, all laser printers structurally consist of three main parts (nodes):

- Block of laser sanitation.

- Image transfer unit.

- Image fixing unit.

The transfer unit is usually understood as a laser printer cartridge and a charge transfer roller (Transferroller) in the printer itself. We will talk about the device of the laser cartridge later in more detail, but in this article we will consider only the principle of operation. It should also be noted that instead of laser scanning in some printers (mainly from OKІ» ) LED scanning is applied. It performs functions tehowever, only LEDs play the role of a laser.

For example, consider laser printer HP LaserJet 1200 (Fig. 1). The model is quite successful and well-proven with a long service life, convenience and reliability.

We print on any material (mainly paper), and the paper feed unit is responsible for sending it to the “throat” of the printer. As a rule, it is divided into two types structurally different from the other. Lower Tray Feeder, called - Tray 1, and top feed mechanism (bypass) - Tray 2. Despite the structural differences in their composition, they have (see Fig. 3):

- Pick-up roller - needed to pull paper into the printer,

- Brake pad and separator assemblyrequired to separate and capture only one sheet of paper.

Directly involved in the formation of the image printer cartridge (fig. 4) and laser scanning unit.

The laser print cartridge consists of three main elements (see Figure 4):

Photocylinder,

Pre-charge shaft,

Magnetic shaft.

Photocylinder

Photocylinder(OPC- organicphotoconductivedrum), or also drum, is an aluminum shaft coated with a thin layer of photosensitive material, which is additionally covered with a protective layer. Previously, photocylinders were made on the basis of selenium, therefore they were also called selenium shafts, now they are made on the basis of photosensitive organic compounds, but their old name is still widely used.

Main property photocylinder- change the conductivity under the influence of light. What does it mean? If any charge is given to the photocylinder, it will remain charged for a rather long time, but if its surface is exposed to light, then in places where the light is exposed, the conductivity of the photo coating increases sharply (resistance decreases), the charge "drains" from the surface of the photocylinder through the conducting inner layer and in this place a neutral charged area will appear.

Figure: 2 HP 1200 laser printer with cover removed.

The numbers indicate: 1 - Cartridge; 2 - Image transfer unit; 3 - Image fixing unit (stove).

Figure: 3 Paper feed unitTray 2 , rear views.

1 - Paper picking roller; 2 - Braking platform (blue strip) with a separator (not visible in the photo); 3 - Charge transfer roller (transferroller) transmitting static charge.

Figure: 4 Disassembled laser print cartridge.

1- Photocylinder; 2- Pre-charge shaft; 3- Magnetic shaft.

Image overlay process.

Photocylinder with precharge shaft (PCR) gets an initial charge (positive or negative). The amount of charge itself is determined by the printer's print settings. After the photocylinder is charged, the laser beam passes over the surface of the rotating photocylinder, and the places where the photocylinder is illuminated becomes neutrally charged. These neutral areas correspond to the desired image.

The laser scanning unit consists of:

Semiconductor laser with focusing lens,
- A rotating mirror on the motor,
- Forming lens groups,
- Mirrors.

Figure: 5 Laser scanning unit with cover removed.

1,2 - Semiconductor laser with focusing lens; 3- Rotating mirror; 4- Forming lens group; 5- Mirror.

The drum is in direct contact magnetic shaftm (Magneticroller), which feeds the toner from the cartridge hopper to the photo cylinder.

The magnetic shaft is a hollow cylinder with a conductive coating, inside which a permanent magnet rod is inserted. Toner in the hopper in the hopper is attracted to the magnetic shaft under the action of the magnetic field of the core and the additional charge supplied, the value of which is also determined by the printer's print settings. This determines the density of the future print. From the magnetic shaft, under the action of electrostatics, the toner is transferred to the image formed by the laser on the surface of the photocylinder, since it has an initial charge, it is attracted to the neutral areas of the photocylinder and is repelled from the equally charged ones. This is the image we need.

There are two main mechanisms for creating an image here. Most printers (HP,Canon, Xerox) toner with a positive charge is used, which remains only on the neutral surfaces of the photocylinder, that is, the laser illuminates only those areas where the image should be. The photo cylinder in this case is charged negatively. The second mechanism (used in printersEpson, Kyocera, Brother) is the use of a negatively charged tuner, and the laser discharges the areas of the photocylinder that should not contain toner. The photocylinder initially receives a positive charge and the negatively charged toner is attracted to the positively charged areas of the photocylinder. Thus, in the first case, a finer transfer of details is obtained, and in the second, a denser and more uniform fill. Knowing these features, you can more accurately choose a printer to solve your tasks (printing text or printing sketches).

Before contacting the photocylinder, the paper also receives a static charge (positive or negative) through the charge transfer roller (Transferroller). This static charge transfers toner from the photo cylinder onto the paper during contact. Immediately thereafter, a static charge eliminator removes this charge from the paper, which removes the attraction of paper to the photocylinder.

Toner

Now we need to say a few words about toner. Tonerit is a finely dispersed powder consisting of polymer balls coated with a layer of magnetic material. The color tuner also contains colorants. Each company in its models of printers, MFPs and copiers uses original toners that differ in dispersion, magnetnspine and physical properties. Therefore, in no case should you refill the cartridges with random toners, otherwise you can very quickly ruin the printer or MFP (tested by experience).

If, after passing the paper through the laser scanning unit, remove the paper from the printer, we will see an already formed image that can be easily destroyed by touch.

Image fixation unit or "fuser"

In order for the image to become durable it needs fix. Freeze the image occurs with the help of additives included in the toner that have a certain melting point. The third main element of the laser printer is responsible for capturing the image (Fig. 6) - image fixation unit or "stove"... From a physical point of view, fixation is carried out by pressing the molten toner into the structure of the paper and then solidifying it, which gives the image durability and good resistance to external influences.

Figure: 6 Image fixing unit or fuser. Above is an assembly view, below with a paper separator bar removed.

1 - Thermal film; 2 - Pressure shaft; 3 - Paper separator bar.

Figure: 7 Heating element and thermal film.

Structurally, the “stove” can consist of two shafts: the upper one, inside which there is a heating element and the lower one, which is necessary for pressing the melted toner into the paper. In the considered HP 1200 printer, the "stove" consists of thermal films (fig. 7) - a special flexible, heat-resistant material, inside which there is a heating element, and a lower pressure roller, which presses the paper due to the retaining spring. The temperature of the thermal film is monitored thermal sensor(thermistor). Passing between the thermal film and the pressure roller, in the places of contact with the thermal film, the paper heats up to approximately 200 ° C˚ ... At this temperature, the toner melts and is pressed into the paper texture as a liquid. To prevent the paper from sticking to the thermal film, there are paper separators at the exit from the oven.

Here we actually considered - "How the printer works"... This knowledge will help us in the future to find out the causes of breakdowns and eliminate them. But in no case should you go into the printer yourself if you are not sure that you can fix it, this will only make it worse. It is better not to save money, but to entrust this business to professionals, because buying a new printer will cost you much more.

In everyday life, laser and inkjet printers are popular. The principle of printing such devices is radically different, which cannot but affect the operational features. In some cases, it is best to use laser products, while in others, inkjet products. However, it is possible to make the final choice in favor of this or that device only after considering the operation scheme.

Working principle of inkjet printing device

Still, it is an inkjet printer that is most often used at home. The principle of its printing is to form an image using liquid ink. They are transferred to the media through special nozzles located on the head. The number of these holes depends on the printer model. Usually their number ranges from 16-64 pieces.

Since the principle of printing an inkjet printer assumes the use of liquid ink, with prolonged downtime, they dry on the nozzles of the head. This requires cleaning the printing element, which involves additional consumption of dyes.

Such devices consist of the following components:

• supporting structure;
• power supply unit;
• print head;
• purification system;
• media feeding devices;
• control unit.

A color image is obtained by superimposing three basic colors on top of each other. Black ink is often added to them so that it is possible to use devices for conventional printing of texts and black-and-white drawings, saving on color inks.

Basic inkjet technologies

Different models can have their own advantages and disadvantages. The printing principle of representatives of inkjet printers may also differ slightly depending on the technology used. The only difference is in the way the ink is transferred to solid media.

1. The piezoelectric method involves the formation of ink dots on paper using special devices that have a connection with the diaphragm. The electric field has a direct effect on the piezoelectric element, and it expands the tube to fill the capillary system. The main advantage lies in the flexible control of the droplet size, which makes it possible to obtain high-quality images with high resolution.
2. The bubble method involves heating elements directly in the nozzles. An electric current is passed through them. During the heating process, gas bubbles are formed, which push the required portion of liquid ink through the holes. After the heater has cooled down, a fresh portion of the dye enters through the nozzles. High quality is noted for detailed line drawing, but when printing solid areas, there may be slightly fuzzy spots.
3. The thermal jet method, as in the previous case, involves the use of a heating element. However, together with it, a special mechanism is used that allows for a faster injection of dyes. In this regard, the performance of devices increases. The color palette of the resulting image is distinguished by contrast.

The ink used can have a different composition. Aqueous ink contains a soluble dye and certain additives to adjust the viscosity. Their advantage lies in their low cost. Pigment ink is UV and humid resistant. The print quality in this case is less dependent on the media.

Using continuous ink supply

With the principle of printing an inkjet printer, everything became clear. Special cartridges are used to store the dyes. However, there is a special system that allows you to provide continuous ink supply in order to save. In this case, the capsule tanks are installed directly on the printhead.

The system is a set of containers connected by a silicone loop through which ink is supplied from donors to the main unit. Thanks to such a device, the constant presence of the original dyes in the print head is achieved. Many large format office appliances have a built-in ink delivery system that cannot be seen from the outside.

How the laser works

A completely different branch of the development of printing devices is laser technology, with the help of which it is possible to achieve high-quality application of dyes on paper. The formation of symbols and images occurs due to the illumination of the beam of the elements of the device with photosensitivity. The resulting copies with textual or graphic information are resistant to fading and abrasion.

Inkjet and laser printers have completely different printing principles. The colorants are toners, which can be transferred to solid media in three ways.

1. Using a two-component development system. The dye particles required for transfer to a special photosensitive drum cannot be fixed on the magnetic shaft without a special magnetic carrier charged by stirring.
2. Using one-component toner without additional additives. Particles of matter in this case are endowed with magnetic properties. Some devices may carry out electrostatic deposition. With this option, the toner does not need to be magnetized.
3. Using a factory blended two-component colorant.

Unlike an inkjet printer, the principle of printing a laser analogue is based on building an image using a photographic method. The laser beam hits a special shaft, the surface of which is electrified due to impact ionization of the internal air.

Construction of laser devices

Laser printers manage to get high-quality printing due to technological features. They include the following elements.

1. The drum is an aluminum cylinder. It is treated with a light-sensitive material that tends to change its electrical resistance in the presence of light.
2. A magnetic roller is used to transfer toner from the reservoir directly to the drum or developing roller found in some modern printers.
3. The squeegee knife acts as a cleaning blade. It removes the excess dye from the raster roller. It can be made of plastic, steel, or fiberglass.
4. The waste toner hopper is designed as a container. This compartment can be located separately from the cartridge or with it. The filling speed of such a reservoir depends on the quality of the toner.
5. The laser unit is designed to create an invisible image on the surface of the drum by illuminating specific areas. The beam intensity can vary significantly.
6. The primary charge roller is made in the form of a metal rod covered with a rubber layer. This element allows for the uniformity of the negative charge.
7. Transfer belt is required for applying intermediate results from color cartridges.
8. The development unit allows toner to be transferred directly onto an electrostatic image created on the surface of the photoconductive element.

Laser printing process

Not everyone fully understands the principle of printing laser printers from computer science courses. Inkjet devices work according to a simplified scheme, so there are no special questions about them. How does the laser printing process take place?

1. The photoconductive roller is charged first. An electric charge is evenly distributed over its surface by rotating the roller. The rotating rod system reduces stress and reduces ozone emissions.
2. Laser scanning is performed. At this moment, the charged surface of the shaft passes under the light beam. The laser hits only those places where the dye will be applied in the future.
3. Toner is being applied. The roller, which has a negative charge, transfers it to the toner. The dye from the hopper is attracted directly to the magnetic shaft, after which it comes into contact with the photoconductive element in those areas where a negative charge remains.
4. The transfer roller in contact with the solid carrier is no longer negatively charged, but a positive one. Dye particles are electrostatically applied to the surface of the paper.
5. The toner dispersed throughout the media is cured by heat and applied pressure. The thermal chamber consists of two shafts between which the paper moves. The temperature is controlled by a special sensor. The colorant is melted and incorporated into the texture of the paper.

comparison table

It is suggested to look at the table to compare the properties of inkjet and laser printers, the printing principle of which is very different.

Having considered briefly the principle of printing an inkjet printer, one cannot fail to note the features of operation.

1. Using the device less than once a week is not recommended to avoid drying out the ink.
2. It is necessary to purchase high quality dyes, otherwise the head can quickly become clogged.
3. The paper should be suitable and marked for inkjet printing.
4. It is required to keep the product clean as dust leads to wear of moving parts.

Features of working with laser devices

The main advantage of laser printers is that there is no need for regular use. It can even be used once a month. This will not affect the quality of work or wear of parts. However, only original toner cartridges should be used, otherwise there is a high risk of damage to the device. In addition, third-party consumables may simply not work.

Before purchasing a device with many positive reviews, you need to find out additional information about the cost:

• supplies;
• wearing parts;
• printouts of one page.

Sometimes it turns out that it is easier to purchase a new device than to replace any parts.

Final part

Having considered briefly the principle of printing inkjet and laser printers, you can draw certain conclusions about the acquisition of certain devices. However, the final choice will depend on what goals are pursued during operation. For printing large volumes of text information, it is more profitable to buy laser devices. If you need to get high-quality photos, then it is better to give preference to inkjet analogs.

The history of laser printers began in 1938 with the development of dry ink technology. Chester Carlson, working on the invention of a new way of transferring images to paper, used static electricity. The method was called electrography and was first used by the Xerox Corporation, which released the Model A copier in 1949. However, for this mechanism to work, individual operations had to be performed manually. After 10 years, the fully automatic Xerox 914 was created, which is considered the prototype of modern laser printers.

The idea to "draw" what is later to be printed directly onto the copy drum with a laser beam belongs to Gary Starkweather. Since 1969, the company has been developing and in 1977 released the Xerox 9700 serial laser printer, which prints at a speed of 120 pages per minute.

The device was very large, expensive, intended exclusively for enterprises and institutions. And the first desktop printer was developed by Canon in 1982, a year later - the new model LBP-CX. HP launched the Laser Jet series with Canon in 1984 and immediately became a leader in the home laser printer market.

Today, monochrome and color printers are manufactured by many corporations. Each of them uses its own technologies, which can vary significantly, but the general principle of operation of a laser printer is typical for all devices, and the printing process can be divided into five main stages.

Drum charge

An Optical Photoconductor (OPC) drum is a metal cylinder coated with a photosensitive semiconductor on which an image is formed for printing. Initially, the OPC is supplied with a charge (positive or negative). This can be done in one of two ways using:

• corona wire, or corona wire;
• charge roller (Primary Charge Roller, PCR), or charging roller.

Corotron is a block of wire and a metal frame around it.

The corona wire is a tungsten filament with a carbon, gold or platinum coating. Under the action of a high voltage between the wire and the frame, a discharge occurs, a luminous ionized area (corona), an electric field is created, which transfers a static charge to the drum.

Usually, a mechanism is built into the unit that cleans the wire, since its contamination greatly deteriorates the print quality. The use of a corotron has certain disadvantages: scratches, accumulation of dust, toner particles on the filament or its bending can lead to an increase in the electric field in this place, a sharp decrease in the quality of prints, and, possibly, damage to the drum surface.

In the second version, a flexible film made of special heat-resistant plastic is wrapped around the supporting structure with a heating element inside. The technology is considered less reliable and is used in printers for small business and home use where heavy equipment loads are not expected. To prevent the sheet from sticking to the stove and twisting it around the shaft, a strip with paper separators is provided.

Color print

To form a color image, four primary colors are used:

• the black,
• yellow,
• purple,
• blue.

Printing is carried out according to the same principle as black and white, but first the printer breaks the image that needs to be obtained into monochrome images for each color. In the process of work, color cartridges transfer their drawings to paper, and their superposition on each other gives the final result. There are two color printing technologies.

Multi-pass

This method uses an intermediate medium - a roller or toner transfer belt. In one revolution, one of the colors is applied to the tape, then another cartridge is fed into the desired place and the second is superimposed over the first image. In four passes, a complete image is formed on the intermediate carrier, which is transferred to the paper. Color printers print at four times slower than monochrome printers using this technology.

Single-pass

The printer includes a set of four separate printing mechanisms under common control. Color and black cartridges are lined up, each with a separate laser unit and transfer roller, and the paper passes under the imaging drums, sequentially collecting all four monochrome images. Only then does the sheet go to the oven, where the toner is fixed to the paper.

Enjoy printing.

Before answering the question of how a laser-type printer works, it should be noted that the first image obtained by C. Carlson using static electricity and dry ink dates back to 1938. But the first prototype of a modern laser device was created in the mid-50s of the last century. It should be added that the principle of operation of a laser printer is based on the so-called process. laser scanning. After the document is scanned, the coloring matter is applied and transferred, as well as the final image is fixed. This principle of laser printing allows you to print text and graphics on plain paper at a fairly high speed. You can find out more about how a laser printer prints below.

If we talk about what a laser printer device is, then it must be said that any model of such a device consists of a drum unit, a laser unit, a transfer unit and a fixing unit. In addition, the cartridges use a magnetic roller or developer roller, depending on the model. Paper is fed for printing using a special unit responsible for this action.

To answer in more detail the question of how a laser-type printer works, it is also necessary to talk about the ink (toner) used in this office equipment. So, a toner is a substance consisting of very small particles of polymer coated with a dye with the inclusion of magnetite. In addition, it includes the so-called. charge regulator. Depending on the manufacturer, all such powders differ in such indicators as density, dispersion, grain size, magenta, etc. For this reason, it is not worth refueling the laser printer with any random powder paint. this will degrade print quality.

Office equipment such as a monochrome printer / mfp is widely used for personal use, i.e. houses. Its main advantage lies in its affordable cost, which is due to the fact that such devices do not need a large amount of software resources or memory. They only need a controller that will allow them to carry out the most basic function, which is to print all kinds of documents. In general, it can be used for printing plain text or some kind of black and white diagrams and diagrams where the presence of color does not matter much. Other advantages of monochrome laser-type devices are the low cost of consumables, withstand heavy loads and the ability to print a large number of pages. But such a printer device does not allow him to print color photographs and complex diagrams. In addition, such a device does not have high print quality.

When it comes to color laser printers, the advantages are good print speeds and the ability to print color schemes, images and photographs. But keep in mind that such a printing device is quite expensive, which, in turn, significantly narrows its availability. Its other drawbacks are low profitability due to the high cost of consumables, high power consumption and insufficient quality of color images. Those. such a device is not suitable for printing professional photographs.

But all types of laser printers usually have the same operating principle. The differences lie only in their cost and functionality and parameters, for example, such as the resolution of a laser printer. As for the printing process itself, it can be divided into five key stages, described below.

The first stage: the formation of a charge of the drum (photo drum)

To answer the question of how a laser printer works and how it works, it should be said that one of its main devices is a print drum covered with a special semiconductor that has a high photosensitivity. It is on it, at the first stage, that the image is formed, intended for further printing. For this, this part is supplied with a charge with a plus or minus sign. This is done, as a rule, using a corotron (corona wire) or a charging shaft (charge roller). The first is a block consisting of a wire around which there is a metal frame, the second is a metal shaft covered with foam rubber or conductive rubber.

The first method of imparting a certain charge to the photovale using a corona wire is that a discharge is generated under the action of a voltage between the frame and the wire (platinum / gold / carbon coated tungsten filament). After that, an electric field is formed, which, in turn, transfers a static charge to the drum unit.

The use of a corona wire has a number of disadvantages, which are that the accumulation of ink / dust particles on its filament or its bending can lead to a sharp decrease in print quality, an increase in the electric type field in a certain place and even damage to the drum surface.

As for the second method, the charge roller, when it comes into contact with the drum, supplies its surface with a high photosensitivity with a certain charge. In this case, the voltage on the roller is an order of magnitude lower, which, in turn, solves the problem with the appearance of ozone. But in order to transfer the charge, contact is necessary. Consequently, the parts of the printer will wear out faster in this case.

Stage two: exposure

The purpose of this stage is to form an invisible image from dots on the surface of the photodrum with increased light sensitivity, and without the use of static charge. For this, a thin laser beam shines on a four- or hexagonal-shaped mirror, after which it is reflected and hits the so-called. a distribution lens. He sends it to a specific place on the surface of the drum. Then the system, consisting of several lenses and mirrors, moves the laser beam along the photogallery, as a result of which a line is formed. Because printing is carried out using dots, the laser is constantly turned on and off. The charge is also removed in a point manner. After the line comes to an end, the photo roll begins to rotate with the help of the step motor and the exposure procedure continues.

Stage three: development

Another shaft in a laser printer cartridge is a metal tube that has a magnetic core inside it. The magnet inside the compartment attracts the toner to the surface of the shaft and, rotating, carries it out. A special metering blade allows you to adjust the thickness of the dye layer and thus prevent its even distribution.

The ink then flows between the drum unit and the magnetic roller. In the areas that have passed the exposure, the toner begins to be attracted to the surface of the photo roll, and in the charged areas, it repels. The colorant remaining on the magnetic roller usually goes on and passes through the hopper again. As for the toner that has moved to the surface of the drum, it makes the image visible on it, after which it follows on, i.e. to paper.

Stage four: transfer

The sheet of paper that was fed into the device passes under the photo. Under the paper is the so-called. transfer roller, which helps to ensure that toner on the drum surface hits the paper surface. A plus sign is applied to the metal core of the roller, which is transferred to the paper through a rubber coating. Microscopic particles of toner transferred to the surface of the sheet are adhered to it exclusively due to static attraction. Any remaining powder particles, paper lint and dust remaining on the drum unit are sent using a squeegee or wiper to a specially designed waste bin. Once the drum unit completes the entire cycle, the charge roller / corotron again helps to restore the charge on its surface and all the work is repeated again.

Fifth stage: consolidation

The toner used in laser printers must necessarily have the ability to melt at high temperatures. Only thanks to this property can it finally fix on the surface of the paper.

To do this, the sheet is pulled between two shafts, one of which presses it down, and the other heats it up. Thanks to this, microscopic particles of the coloring matter are fused into the structure of the page. After leaving the oven, the powder hardens quickly enough, as a result of which the printed picture or text becomes sufficiently stable.

It should also be added that the upper roller, which heats up the sheet of paper, is in the form of a thermal film or a Teflon roller. Moreover, the second option is considered more durable and reliable. However, it is expensive and is used most often in devices that have to withstand heavy loads. The first option is less reliable, and is usually used for printers intended for small offices and home use.

Many believe the laser printer is so named because it burns images onto paper with a laser. However, the laser alone is not enough to obtain a quality print.

The most important element of a laser printer is the drum unit. It is a cylinder covered with a photosensitive layer. Another essential component of the toner is dye powder. Its particles are fused into a sheet of paper, leaving the desired image on it.

The drum unit and toner hopper are most often part of one single cartridge, which in addition has many other important parts - charge and development rollers, a cleaning blade and a waste toner hopper.

Now let's look at how all this happens in more detail.

Stages of the printer

The electronic document is sent to print. At this point, the printed circuit board processes it, and the laser sends digital pulses to the cartridge. By charging the imaging drum with negative particles, the laser transfers the image or text to be printed onto it.

When the laser beam hits the drum, it removes the charge and uncharged zones remain on its surface. Each toner particle is negatively charged and when it comes into contact with the drum unit, the toner adheres to the uncharged fragments due to static electricity. This is called image development.

A special positively charged roller pushes the sheet of paper against the drum unit. Since oppositely charged particles are attracted, toner adheres to the paper.

Then the paper with the toner is heated to a temperature of about 200 degrees using the so-called stove thermal roller. This straightens the toner and the image is securely fixed to the paper. Therefore, documents freshly printed on a laser printer are always warm.

The last step is to remove the charge from the drum unit and clean it of the remaining toner using a cleaning blade and a waste toner box.

This is how the printing process works. The laser paints the future image with charged particles. The imaging drum catches and transfers the coloring powder onto the paper. The toner adheres to the paper by static electricity and fuses to it.

The copying technique works on the same principle.

Benefits of a laser printer

It is believed that the print speed of a laser printer is faster than an inkjet printer. On average, this is 27-28 prints per minute. Therefore, they are used to print a large number of documents.

The device does not make much noise during operation. The print quality is very high at a low cost per page, which is achieved due to the low consumption and price of toner. The cost of most models of laser printers is also quite affordable.

For many years, there has been a debate over whether a laser printer is harmful to health. The particles of toner used in laser printing are so small that they easily penetrate the human body, settle and accumulate in the respiratory tract. Continuous contact with toner for 15-20 years can lead to headaches, asthma and other illnesses.

However, printer manufacturers assure that there is no harm in daily use of the printer. Production technologies are constantly being improved, and cartridges are tested in laboratories.

The danger can arise only when you try to open and refill the cartridge yourself. Toner particles can get into the lungs and are very poorly excreted from the body, so it is better to entrust the refueling of the printer to a specialist.

The speed, durability and print quality of laser printers is really great. This device is indispensable in the work and daily life of many users and is not as whimsical as the capricious inkjets, which often have problems with printing when refilling.

If you still got a not very successful model of a laser printer and you did not use it a lot, then do not despair. KupimToner buys new printers from different brands, as well as accessories for them, offering a decent price.