How is the working principleof laser printer?

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How is the working principleof laser printer?

Příspěvekod adtozhou » 20 říj 2017 04:21

Laser printer is a laser scanning technology and electronic imaging technology integration of the output device, according to its different printer type, its print function is also a certain difference, but its working principle is basically the same: once the implementation of the print command, the computer The application will pre-process the content to be printed, and then converted by the laser printer driver can be identified by the printer print command or print control language, this command signal once sent to the internal high-frequency drive circuit, you can control Laser transmitter on and off, resulting in dot matrix laser beam, and through the mirror into the sound and light deflection modulator; the same time, from the computer to send binary graphics dot matrix content, from the interface to the shape generator, the formation of the binary pulse signal of the desired shape is controlled by the pulse signal generated by the synchronizer, and then the frequency synthesizer and the power amplifier are added to the acousto-optic modulator to carry out the laser beam injected by the mirror modulation. The modulated beam is injected into the polygon mirror, and then the beam is focused by the wide-angle focusing lens and then directed to the surface of the printer toner, so that the angular velocity scan becomes linear velocity scanning to complete the whole scanning process.

The laser printer photosensitive toner is a photosensitive device, has a light conduction function. The photoconductive coating on the surface of the toner is automatically charged by the charging roller with a certain amount of charge before scanning exposure. Once the laser beam is spread through the lattice form onto the surface of the toner, the spot to be scanned is automatically turned on by exposure, so that the charge is released quickly by the conductive base. And did not accept the exposure of the spot still maintain the original charge size, so that the surface of the photosensitive toner can produce a potential difference latent image, once the potential difference latent image of the photosensitive toner to rotate to the location of the toner roller , Those with the opposite charge of the toner can be automatically adsorbed to the photosensitive toner surface, resulting in toner images.

If the tn660 toner containing the toner image continues to rotate and the image is about to be transferred, the pre-placed paper is also transferred to the middle of the photosensitive toner and the image transfer device. This time the image transfer device will automatically send the paper The back of the discharge of a strong voltage, the photosensitive toner on the toner like the adsorption to the printing paper, and then put the toner image on the printing paper to the high-temperature fixing device to heat, pressure, so that toner Melt to the paper, so that the specified print content will be displayed on the printing paper, and thus the entire printing process is over.
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