Developing device
AssigneeRicoh Company, Ltd.
InventorsFuchio Kanno, Toshio Kaneko, Koji Sakamoto
Life of this patent
Estimating the term…
Abstract
A developing device for developing an electrostatic latent image includes a tank for containing therein a quantity of developer, a developing sleeve driven to rotate in a predetermined direction and having an outer peripheral surface which defines a path for transporting the developer, a magnet roll disposed inside of the developing sleeve for keeping the developer attracted to the peripheral surface of the sleeve, and a pressure plate pressed against the sleeve to form a thin film of developer on the peripheral surface of the sleeve before being applied to the latent image.
Claims23
A developing device for developing an electrostatic latent image by bringing a film of developer close to said latent image, said device comprising:
- a tank for containing therein a quantity of developer;
- developer carrying means for carrying thereon said developer, said developer carrying means being driven to move along a predetermined path including a developing region where said electrostatic latent image is developed by said developer;
- means for attracting said developer to said developer carrying means;
- means for forming a film of developer having a predetermined thickness on said developer carrying means after said developer, supplied at least partly from said tank, has been attracted to said developer carrying means, said means for forming being disposed in the upstream of said developing region and including a pressure plate having a base end supported by a housing of said device and a forward end pressed against said developer carrying means such that said forward end is directed against the direction of movement of said developer carrying means at the points of contact;
- and
- means for controlling the amount of said developer to be supplied to said means for forming.
A developing device for developing an electrostatic latent image by bringing a film of developer comprised of magnetic toner particles closer to said latent image, said device comprising:
- a tank for containing therein a quantity of magnetic toner particles;
- a developing sleeve driven to rotate in a predetermined direction having an outer peripheral surface on which said tones particles may be carried;
- means for forming a fluctuating magnetic field along the peripheral surface of said developing sleeve;
- a pressure plate having a base end and a forward end which is pressed against the peripheral surface of said developing sleeve and directed counter to the rotating direction of said developing sleeve;
- and
- means for vibrating said pressure plate.
A developing device for developing an electrostatic latent image by bringing a film of developer closer to said latent image, said device comprising:
- a tank for containing therein a quantity of developer;
- a developing sleeve driven to rotate in a predetermined direction having an outer peripheral surface on which said developer may be carried, said sleeve including a conductive base layer, a dielectric layer formed on said conductive base layer and a plurality of floating electrodes provided at least at the peripheral surface of said sleeve,
- means for attracting said developer to the peripheral surface of said developing sleeve;
- means for forming a film of said developer of a predetermined thickness on the peripheral surface of said developing sleeve before application to said latent image;
- and
- means for applying a predetermined potential to said conductive base layer of said developing sleeve and also to said means for forming a film.
Dependencies are inferred from the claim text.