Laser is not in the future of LED printing technology will become a printer

Because of work reasons, used a friend asked me to buy what he bought is suitable for printers, inkjet printers and laser printers, of course, in accordance with tradition, I'll talk to him if you are at home or have requirements for color inkjet printer output, suggest to buy; if it is commercial, and there is a high requirement for speed and output. Not often output color documents, the proposed purchase of laser printer. However, with the inkjet printer output speed greatly improved, but also in color output and environmental protection than traditional laser printers have a great advantage. At this time the laser printer is very need a technique to help them recover this disadvantage. LED (light-emitting diode) technology came into being, and then we will give you a brief introduction to LED printing technology, we temporarily call it a page printer, so as to distinguish the traditional laser printer.

The difference between LED printer and laser printer

The imaging principle of laser printer and LED printer is basically the same, are relying on carrying the image signal light image latent image on a photosensitive drum is formed, and the image in the absorption of latent image after carbon transfer to the paper and fixing so as to complete the print job. The biggest difference is that the light source is different from the optical system.

Laser printer is a high power laser diode, the print control signals, according to the requirements of printing laser beam laser tube, the laser beam after focusing lens and projected onto a high-speed rotating prism, the prism rotation with the changing angle of reflected laser beam single point laser beam, thereby forming a change of position, the beam passes through the lens group in the shaping and change direction, forming an axial reciprocating scanning laser in the photosensitive drum and the photosensitive drum exposure in single photosensitive after the photosensitive drum rotation, the laser beam of light to continue to the next line, thus completing the photosensitive the process of the photosensitive drum.

The LED printer will tens of thousands of tiny LED light emitting diodes arranged in a queue, placed above the axial direction of the photosensitive drum, each corresponding to a physical resolution of the printer in the light emitting diode, print control signals, need to be part of the LED lights to print, they produce light through the focusing head is directly projected on the photosensitive drum the surface of the photosensitive drum in a single exposure, sensitive after the photosensitive drum rotation, LED lights to make photographic printing light, the next line, thus completing the photographic process.

Can the laser printer in the optical system using LED light source or a laser light source in optical system in LED? The answer is negative, we should see that the longer the optical system of the laser printer, after several light refraction and reflection, and the residence time of laser beam on the photosensitive drum is very short. In this case, the ordinary light source will be caused by multiple reflection light intensity attenuation, the beam divergence in the transmission process, resulting in exposure to light intensity of the surface of the photosensitive drum is insufficient, it is difficult to make the beam diameter of the photosensitive drum normal exposure. Only the laser beam with good transmission performance and power concentration can meet the demand. The laser tube used in the LED printer optical path system, because of the complexity of the control circuit of the laser tube, high cost and difficult to achieve. The light path of the LED printer is short, and the light stays on the surface of the photosensitive drum for a long time.

Introduction of LED printer printing technology

LED printer with a group of light emitting diode to scan the photosensitive imaging, LED photosensitive imaging using LED array intensive light emitter, the electrical signal data into a light signal and then transmitted to the photosensitive drum imaging. But the laser print imaging technology is the data signal is transmitted to all a transmitting device emits light through the rotation of the prism reflection image on the photosensitive drum. As a result, the imaging process of LED technology is more obvious than the laser imaging process is simple, but also because of this, usually LED printing technology is superior in speed of laser printing. Experimental data show that the laser printer is difficult to achieve 60PPM, the realization of 120PPM is non LED printing.

The photosensitive drum of LED printer plays an important role in the fixed image, it will directly affect the contrast of the print. Some of its core: toner, photosensitive drum, charging roller, magnetic roller and scraper, the corresponding role of the following:

As a direct melting of the adhesive on the print media, the main components of the scientific composition of the play a decisive role;

As the core component of the exposure imaging, the optical performance of the drum is also decisive;

The charging roller (also called rollers) is in preparation for the exposure imaging, it gives the photosensitive drum charging result will directly affect the degree of exposure, thus affecting the print density;

Magnetic roller as a direct participant in the whole transfer, plays two roles: adsorption of carbon particles, to the carbon powder particles;

The surface of the magnetic roller surface is not sticky powder, so that the printing of the relevant area will also appear blank. In addition, the magnetic roll in print after 3 cycles, the surface will appear aging layer, which will influence the magnetic roller to the toner charging effect, which directly affect the toner from the magnetic roller is transmitted to the number of the surface of the photosensitive drum, will directly affect the print contrast;

The main function of the scraper is to control the number of carbon particles on the surface of the magnetic roller, the auxiliary function is to charge the toner particles, so it also has a direct impact on the contrast of the print.