subject: Photosensitive Drum Laser Printer To Do The Work Principle - Laser Printers, Office Equipment - [print this page] Photosensitive drum in the printing process, preferably through a series of steps or stages to illustrate.
In the first phase, the primary charge roller (PCR) to a uniform negative DC voltage added to the OPC drum surface. This process is known as the preparatory stage.
In the second phase (also known as the imaging phase), the laser beam shines where OPC drums, DC voltage to discharge, the electrostatic latent image formed on drum.
The third stage, through the imaging section (or bunker) to show the drum on the toner particles from the toner image. Toner in the magnetic roller sleeve stationary magnetic and high-pressure Power supply Produce variable DC bias to do with, the transfer to the sleeve. The variable DC bias by the Printer Configuration control of the concentration. Magnetic roller sleeve on the toner amount of control by the rubber scraper, scraping magnetic roller sleeve by the pressure to keep the powder volume constant. The toner smears will also generate electrostatic charge, electrostatic toner layer also uniform, making it easy to transfer to the OPC drum.
Magnetic roller sleeve at the same time also increases with the exchange of signals. This signal is reduced in the magnetic roller sleeve on toner adhesion, an increase of the toner and drum without a laser beam between the exposure of the region to promote repulsion. The exchange potential to improve the toner in the print density and contrast paper.
With the OPC drum by laser exposure of the region close to the magnetic roller, as toner and OPC drum surface by laser exposure has the opposite potential, the toner particles sucked drum surface.
To do with the transfer roller, the image is transferred onto the paper from the drum through the bottom. Transfer to a paper roll to the back of the positively charged He Jia, the positive charge will be negatively charged drum surface to breathe toner on paper. Paper residual electrostatic charge has been static snapshot component of consumer devices let go. Made by fusing the components used, the image is fixed on paper, fuser film from the previous snapshot components and make up the composition of film roll. Rubber fuser roll of paper under pressure up to the last snapshot membrane, and then to melt penetrated a tissue toner. Canon fuser film used on the new "Instant-On" technology. Fuser film by a thin soft ceramic heating elements heat. Fuser film temperature is almost instant, and thus there is no warm-up time.
Fourth stage is clean OPC drum. In the print cycle, an average of about 90% of the toner is transferred onto the paper. OPC drum still 10% of the residual toner from the drum through the scraper clean down to do with the collection of leaves into the waste bunker, and stored in a waste bunker.
Once the print cycle is complete, the primary charge roller voltage will increase the exchange surface of the drum, the drum surface, eliminate the remaining residual charge. Then OPC drum roll to do with the main charge to enter the preparation stage, start a new print cycle.
