The micro-piezoelectric technology divides the control of the ink droplets during the ink-jet process into three phases: before the ink-jet manipulating, the piezoelectric element first shrinks slightly under the control of the signal; then, the element produces a large extension and drops the ink. The nozzle is ejected; at the moment when the ink droplets are to leave the nozzle, the components will shrink again, and the ink level will be contracted from the nozzle cleanly. This creates a very tiny vapor bubble that expands to eject a drop of ink onto the top of the capillary. Inkjet printers using this technology are rarely seen today. The print information from the character generator and the analog modulator controls the charge on the control telegram to form charged and uncharged ink droplets. The deflecting electrode then changes the flying direction of the ink droplets so that ink droplets that need to be printed can be printed. Flying to paper, born with character/graphic records. In addition, the piezoelectric print head is fixed in the printer, so only need to replace the ink cartridge. This principle of ink-jet printing is the use of a piezoelectric actuator to apply a constant pressure to the ink in the print head so that it is ejected continuously. Compared with the continuous type, the structure is simple, the cost is low, and the reliability is high. However, due to the inertia of the jet, the ink droplet ejection speed is low. And the efficiency of working methods is not high enough and it is not accurate.
Hot bubble jet technology
At present, random-type inkjet technology mainly includes two types: micro piezoelectric type and hot bubble type:
In the random ink jet system, ink is ejected only when it is needed for printing, so it is also called on-demand type.
In this way, the liquid level of the ink droplets is precisely controlled, and the ink droplets ejected each time have a perfect shape and an accurate flying direction.
Micro Piezo Technology
Inkjet printers generally use thermal bubble jet technology, which uses ink to heat, expand, and compress ink in a short period of time to eject ink onto the printing paper to form ink dots, increasing the inconsistent color of ink droplets, and achieving high speed and high speed. Quality print. However, the structure of this kind of inkjet printer is more complicated than the random one: the ink needs a pressurizing device, and the terminal must have a recovery device to recover without intervening in the record.
The micro-piezo inkjet system has a transducer disposed on an ink-filled head, and the transducer is controlled by a print signal to control ink ejection. Applying a current to the crystal will cause it to repress inwards. The ability to control the ink droplets is strong, and the color point is also reduced to a large extent. The resulting ink dots do not have a tail, so that the printed image becomes clearer. Hot bubble inkjet printers need to have inkjet nozzles installed in each cartridge: this increases the cost of the cartridge.
Continuous ink jet technology is represented by a charge modulation type. Heating is stopped and the ink cools, causing the vapor to condense and contract, thus stopping the ink activity until the next time steam is generated and an ink droplet is born.
Random inkjet technology
This continuous inkjet system can generate high-speed ink droplets, so the printing speed is high and plain paper can be used. For the deflection electrode, some systems use two pairs of mutually perpendicular deflection electrodes to perform two-dimensional deflection of the ink droplet printing position; some systems adopt multidimensional control of the deflection electrode, namely a multi-dimensional deflection type. Because in addition to the size of the ink droplet, the consistency of the ink droplet's appearance and density will have a significant impact on the image quality, and the ink dot direction and shape produced at high temperatures are not easily controlled, so the high-precision ink droplet control is very important. When the current is restored, the crystal is pulled backward again and enters the ready state for the next drop of ink. The two ink jet technologies are very different in principle. Different print media can obtain high-quality print results, and it is also easy to implement color printing. The principle of thermal bubble jet printing is to load the ink into a very tiny capillary tube and quickly heat the ink to the boiling point through a miniature heating pad.
Comparing these two methods, the thermal bubble type print head is susceptible to chemical changes and the properties are not disorderly due to the high temperature of the ink, so the authenticity of the colors to be printed will be affected to a certain extent; on the other hand, the ink is ejected through the bubbles. However, the directionality and volume of the ink particles are not well understood, and the edges of the printed lines are easily uneven, which affects the print quality to a certain extent. This is its shortcomings. However, the disadvantage of the piezoelectric ink jet printer is that if the piezoelectric print head is damaged or obstructed, the entire printer needs maintenance. When the current is interrupted, the crystal bounces back to its original position and a small amount of ink is ejected through the nozzle. Easy to achieve high-precision print quality up to 1440dip, and no need to heat the micro-piezo inkjet, the ink will not change due to chemical changes in the heat, it greatly reduced the requirements of the ink. The micro-piezoelectric print head technology utilizes the discharge characteristics of the crystal during pressurization, and ejects the ink at a normal temperature.
Continuous inkjet technology
How inkjet printers work
Inkjet printers can be roughly divided into A4 inkjet printers, A3 inkjet printers, and A2 inkjet printers if they are only divided from the print format. If they are used, they can be divided into ordinary inkjet printers and digital photo printers. Mobile inkjet printer. According to the working principle and arrangement structure of the micro-piezoelectric inkjet transducer, it can be divided into several types: piezoelectric tube type, piezoelectric film type, and piezoelectric film type. The early ink-jet printers and the current large-format ink-jet printers all use continuous ink-jet technology, and the popular ink-jet printers in the market today generally adopt random ink-jet technology.
The use of micro-voltage changes to control the ejection of ink dots not only avoids the disadvantages of the thermal bubble jet technology, but also enables the use of a piezo-electric crystal in the rear of the micro-ink reservoir. The early ink-jet printers and the current large-format ink-jet printers all use continuous ink-jet technology, and the popular ink-jet printers in the market today generally adopt random ink-jet technology. The two ink-jet technologies, the so-called ink-jet printers, form letters or images by ejecting droplets of ink onto a print medium. For the purpose of recording, the vibration signal of the oscillator is used to excite the natural ink droplets of the jet, and the size and spacing of the ink droplets are controlled.
The so-called inkjet printer is to form letters or images by ejecting ink droplets onto the print media. In this random ink jet system, in order to compensate for this shortcoming, many random ink jet printers adopt a multi-nozzle method to improve the printing speed. Ink drops that were not involved in the record were recovered by the catheter.
Talking about the principle of inkjet printer
June 01 04:05:28, 2024
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