Monochrome laser printer
Laser printers are used in a wide variety of applications, from office printing, to medical printing, to bar code printing. A laser printer applies electrophotography in which a laser beam is irradiated on a photosensitive member for exposure. A latent image is created on the surface of an insulating, photo-conducting material by selectively exposing areas of the surface to light. A difference in electrostatic charge density is created between the areas on the surface exposed and unexposed to light. The visible image is developed by electrostatic toners. The toners are selectively attracted to the photoconductor surface either exposed or unexposed to light, depending on the relative electrostatic charges of the photoconductor surface, development electrode, and the toner. In a typical laser printer, radiation from a laser is shaped, and imaged onto a film plane to produce a desired spot size. The spot, called a pixel, forms the smallest element of the image. A laser printer varies light intensity to control exposure and therefore density of the laser print. The objective is to print predictable densities with minimum increments to produce a nearly continuous gray scale over the desired density range. A laser printer arranges toner on a surface of a photoreceptor drum charged by laser light and sandwiches a sheet between the photoreceptor drum and a transfer roller to place the toner on a surface of the sheet or the like in a shape to be transferred. The toner placed on the surface of the sheet or the like is fixed on the sheet or the like by a fixture roller and thus discharged. Monochrome laser printers use a single laser scanning unit (LSU) and a single organic photoconductive cell (OPC) drum since they transfer only black ink onto a sheet of paper. To the contrary, color laser printers transfer ink having four colors, such as black (K), magenta (M), yellow (Y), and cyan (C), onto the paper, and thus four LSUs and four OPCs photosensitive drums which correspond to the respective four colors are required.
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