Mostly used in more high-end printer

Because the drum continuously in the charge and discharge cycle process, the required charging potential rises fast, the surface potential saturated potential is higher than the application; otherwise, do not increase the initial potential, will also affect print quality. After charging the photosensitive drum to a small dark decay, or remain to the surface potential, potential difference can not form the necessary latent image. After exposure of the photosensitive drum discharge faster that light fades quickly. Another forming factor of green laser pointer’s performance price ratio is structure. Discharge more thorough the better. Because the number of remaining potential, not only affects the latent image contrast, will bring prints of the "bottom ash." ④ fatigue. Drum in use, the printer should be recharged, which should have good fatigue resistance, the required life time, the print quality does not decline because of continuous use. Photoconductive drum better stability characteristics, should meet the requirements of continuous use. green laser pointer printers use a drum, usually three-tier structure. The first layer is the aluminum cylinder (conductive layer), the second layer on the surface of the cylinder is vacuum evaporation method, coated with a layer of photoconductor materials (photoconductive layer), the third layer is the outside of the photoconductive material and then plated layer of insulating material (insulating layer). The third forming factor of green laser pointer’s performance price ratio is color.Some of the drum in order to better charge, in the photoconductive layer and the aluminum conductive layer of the middle, add a layer of superconducting material plated to make the charge more quickly released. The surface of the insulating layer of the drum, one to improve the wear resistance, increased service life; the second is for the photoconductive layer to provide protection against wear and tear of light conductor to keep the light conductor photoconductive properties. Conductive layer of aluminum tube with a laser printer is connected to ground, so that the rapid release of potential exposure. It is a very high precision cylinder, in the process of operation, to maintain constant speed operation and to maintain a uniform charge. Data translation and transmission of laser printers (1) Data Translation: Different types of green laser pointer have different appearance and functions. To print the full text, image, in addition to the functions of laser printer itself must also be put through the computer to print the contents of the text or image with a word processor or graphics software, edited into a certain form of computer language. Its contents are described in the decision by the computer editing software, and laser printer does not have any relationship. When we selected a printer command, and press OK to print button, the computer the edited data sent to the printer through the printer interface, the printer driver to print to explain the content and convert it into a language the printer can be identified (and called printer language), according to their own language by the printer prints out the text or image has been edited. Different models of laser printers, print languages, using different drivers. Some green laser pointer only have the led flash light function.Of course, there compatible printer driver. Now the production of laser printers, the language commonly used standard PCL5 or PCL6 print languages. (2) data transfer: the communication between printer and computer transmission port there are many more common is the "serial" or "parallel." EP P / ECP (Enhanced ParalleI Port / Extended Capabilities Port) called Enhanced / Extended Parallel. "Serial" As the slow, seldom used. Others such as the SCSI interface, due to speed, mostly used in more high-end printer.