Patent ID: 6064463
Filing Date: 2000-05-16
Classification: G03G

Abstract:
A developing apparatus using one-component toner comprising:a developing roller for carrying and transporting one-component toner to a developing region opposing an image bearing member bearing an electrostatic latent image; anda blade for regulating an amount of one-component toner carried on the developing roller,wherein the blade pressed against the developing roller is formed with a slant face at a tip end thereof, the slant face being inclined so that a distance between the slant face and the developing roller is gradually reduced along a direction of incoming toner, andan abutment force of the blade and a tilt angle of the slant face of the blade are set so that an angle of aperture .theta. between the slant face and the developing roller in a state of being pressed against the blade is equal to or more than 12.5.degree., andwherein the angle of aperture .theta. is set by setting a radius R of the developing roller and a tilt angle .psi. at the tip end of the blade so as to satisfy .theta.=.psi.+sin.sup.-1 (w/2R) where .psi. denotes a tilt angle of the slant face of the blade, w denotes a nip width on which the blade contacts with the developing roller, and R denotes a radius of the developing roller.