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During the laser printing process what determines when the toner sticks to the drum and when it does not stick to drum?
Wiki User
∙ 12y ago
Laser printers work by placing toner on an elecrically charged rotating drum and then depositing the toner on paper as the paper moves through the system at the same speed as the drum is turning. The negatively charged toner is more negative than the -100 V charge on the drum surface but less negative than the -600 V. The toner is attracted to the -100 V area of the drum because the -100 is more positive than the toner is; the toner is repelled from the -600 V part of the drum because it is more negative than the toner is.
The electric charge at each point on the drum surface. This in turn is determined by the amount of light received by each point on the drum. The process begins by charging the entire drum surface. The image to be copied is then projected onto the drum.
Wiki User
∙ 11y ago
Wiki User
∙ 12y agoThe laser beam
no that is not the right answer the electric charge determines when the toner sticks to the drum and when it doesn't....do more research if you are going to answer a question!
Wiki User
∙ 12y agoA laser (actually a row of tiny LEDs) is first used to generate an electrostatic charge on the drum in the pattern required for printing. The drum then rotates past a slit in the toner cartridge. The toner, which carries an opposite electrical charge, is drawn across to the charged places on the drum forming the image. The scientific principle is similar to creating a charge on a plastic comb by brushing your hair quickly then picking up small bits of paper with the comb!
Once the pattern is formed the paper is pressed against the drum to transfer the toner to the paper, the paper then passes close to a very hot wire which melts the toner onto the paper.
Exact details vary from printer to printer. If you are interested in more detailed information, look around on the HP website where you will find (somewhere!) a document complete with some nice diagrams.
Wiki User
∙ 12y agoIn laser printers, the drum that does the attracting of the toner particles is a roller that has been coated with an organic photo-conductor (OPC) and has been given a good charge of static electricity. When the laser beam focuses a tiny spot of light onto the drum, that spot of photo-conductor loses its static charge, and will no longer attract toner particles.
The drum continues to turn, giving the laser more room to 'write' on, and giving the previously 'written' roller surface a chance to get really close to dry ink, the toner particles. After picking-up/not-picking-up toner, the drum is pressed against paper which transfers the toner from the drum to the paper. Continuing to turn, the drum area is then exposed to another electrical field, this time to 'erase' the static electricity image that is left over on the drum's surface. Which is then turned until it is under the laser again and where the surface area can get reused, re-imaged by the laser again.
The toner particles on the paper are just loose and sitting there, until it goes through some high heat to melt the toner particles, which then stick pretty well to the paper.
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During the writing phase, the uniform high charge is discharged only in the places where toner is meant to stick to the drum. This is how the laser printing process that determines when the toner sticks to the drum.
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During the laser printing process what determines when the toner sticks to the drum and when it does not?
Electric charge! The drum is coated with a photo-conductive layer, whose electrical resistance changes when exposed to light. In the old days this was based on selenium, but nowadays it uses an organic plastic compound. First the drum is electrically charged using a 'corona wire' - a very fine wire grid at high voltage. Then a laser (or, these days, an LED array) is used to expose the 'white' areas, causing electric charge to leach away in those areas. Next toner (which is itself tumbled to build up an electric charge) is brushed over the drum, so that it sticks only to the electrically charged ('black') areas on the drum. It's then a simple matter to get the toner off the drum and onto the paper. Finally the drum is cleaned with a brush and/or wiper blade, and electrically discharged using a 'quench' lamp before the whole process starts again.
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