Canon M3010 Series Service Manual

Contents

Canon M3010 Series Service Manual Manual pdf 29 page image

22 2-142-14Technical Overview > Image Formation System > Overview/Configuration > Development BlockTechnical Overview > Image Formation System > Overview/Configuration > Development Block■ Static Latent Image Formation BlockThis block is comprised of two steps and forms static latent images on the photosensitivedrum.When the final step of this block completes, negative charge remains at dark areas on thedrum surface where laser beam has not been exposed, and negative charge is eliminatedfrom bright areas on the drum surface with laser beam exposed. The images on the drumwith negative charge are called static latent images because human eyes cannot detect them.0 Time (t)Surfacepotential(V)Laserbeamexposure(step 2)Transfer(step 4)Primarycharging(step 1)Primarycharging(step 1)Exposed areaUnexposed areaStep 1: Primary chargingFor preparation of latent image formation, the surface of photosensitive drum is chargedwith even negative potential. In this primary charging, the charge is applied from the primarycharging roller directly to the photosensitive drum.DC bias is applied to the primary charging roller to maintain an even potential on the surfaceof the photosensitive drum.Primary charging rollerPhotosensitive drumDC biasF-2-11F-2-12Step 2: Laser beam exposureIn this step, static latent images are formed on the photosensitive drum with laser beam.When laser beams are scanned on the photosensitive drum negatively charged, bright areaslose their charges, eliminating negative potential on the surface of the photosensitive drum;on those portions, static latent images are formed.Laser beamExposedareaUnexposedarea■ Development BlockThis block is comprised of one step; it puts toners to the static latent images on the surface ofthe photosensitive drum and visualizes the images using toner projection development. Thetoner projection development makes the toner jump on the surface of the photosensitive drumand develops the images.The toner (developer) used for this equipment is a one-component toner that comprisesmagnetic body and resin, etc.Step 3: DevelopmentToner is affixed to static latent images on the surface of the photosensitive drum.The toner is charged negatively by friction between the developing cylinder and the surface ofthe developing blade.An area on the photosensitive drum exposed with laser beam has higher potential than thedeveloping cylinder; the potential difference between the drum surface and the cylinderenables the toner to jump on the drum surface and makes them visible images.AC bias superimposed with the development DC negative bias is applied to the developingcylinder.Blade Developing cylinderAC biasDC biasPhotosensitive drumUnexposedareaExposed area Exposed areaUnexposed areaF-2-13F-2-14