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What to pay attention to when charging the laser printer-Alice factory

November 26, 2021

The photoconductor material on the surface of the photosensitive drum is an insulator when it is not exposed to light, and is in a neutral state without any charge. To realize the "electrostatic latent image" on the surface of the photoconductor, the surface of the photoconductor must be charged to make it charged. Only in this way, when the laser beam scans onto the light conductor, the exposed points of the light conductor are turned on to form a beam dot matrix. The dot matrix charge conducts with the substrate to form a "potential difference latent image". When the photosensitive drum rotates to a position that is tangential to the developing magnetic roller, the toner on the magnetic roller with the opposite charge properties of the photoconductor surface is attracted to the surface of the photosensitive drum. As a result, a toner image appears on the photosensitive drum.

If the photosensitive drum can absorb the toner according to the graphic information, the toner cartridge should be charged first. The charging electrode is a tungsten wire parallel to the photosensitive drum axis with a DC high voltage of 5-7kV. When the tungsten wire is very close, the surrounding air is ionized to produce corona discharge, which makes the photosensitive drum charged. The positive or negative of the voltage is determined by the voltage carried by the tungsten wire. If the photoconductive material is a selenium-tellurium alloy, it is charged positively. After the photosensitive drum rotates once, the entire surface is charged.

The method of laser printer charging the photosensitive drum is different depending on the model, but the charging principle is basically the same, and the surface of the photosensitive drum is charged by the corona discharge of DC high voltage.

Early laser printers used a composite structure of electrode wire and grid to charge more, and most of the new laser printers used a charging rubber roller (FCR) to charge the photosensitive drum. When the high voltage generator sends a high voltage to the electrode wire, a strong electric field is formed between the electrode wire and the grid, and a corona is released. The air between the electrode wire and the photosensitive drum is ionized, and the air ions migrate to the surface of the photosensitive drum, making the surface of the photoconductor (photosensitive drum) full of charge. This method can make the surface of the photoconductor (photosensitive drum) uniformly charged, but at the same time it also generates a large amount of negative ions (ozone). When ozone accumulates to a certain amount, it is harmful to the human body. Such as Canon's early products LBP-SX and ST models, HP's early products HP2 and 3, Panasonic KX6500 produced in Japan, Lenovo LJ6L, LJ6P and other models all use this method to charge.

Most modern laser printers use charging rollers for charging. Due to the contact charging method, high charging voltage is not required, and no ozone is generated. However, the accumulation of ionized dust increases the wear on the photosensitive drum, which will also There is uneven charging.

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We (Alice) are a manufacturer specializing in the production of nameplates for office appliances. We have 21 years of experience in making furniture signs. We can produce zinc alloy, aluminum alloy, stainless steel, copper, brass, iron, and titanium. , PC, PET, PE, pvc and other different labels.

Contact us E-mail: sales03@alicelogo.com

whatApp: +86 132 6564 6796

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