Monocomponent developing arrangement for electrophotography
AssigneeAetas Technology Incorporated
InventorLawrence B. Schein
Life of this patent
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Abstract
A jump monocomponent development arrangement includes a dielectric photoreceptor belt having an image-bearing surface for receiving an electrostatic charge image and a development station having a supply of toner particles with a mean diameter in a range from 8 microns to 14 microns and including large and small additive particles having mean diameters in size ranges of 6 to 12 nm and 20 to 50 nm, respectively, and in amounts sufficient to provide surface coverage of the toner particles in ranges from about 5 percent to about 50 percent and about 50 percent to about 150 percent, respectively.
Claims18
A jump monocomponent development arrangement comprising:
- a photoreceptor member having an image-receiving surface on one side to convey an electrostatic charge image adjacent to the development station;
- a development station including a developer roller having a toner-carrying surface separated by a development gap from the image-receiving surface of the photoreceptor member to apply toner particles to an electrostatic charge image to produce a toner image thereon by jump development;
- a toner supply for supplying toner particles to the surface of the developer roller together with large additive particles having a mean diameter in the range from about 20 nm to about 50 nm and being present in an amount sufficient to provide surface coverage of the toner particles in a range from about 5 percent to about 50 percent and small additive particles having a mean diameter in a range from about 6 nm to about 12 nm and being present in an amount sufficient to provide surface coverage of the toner particles in a range from about 50 percent to about 150 percent;
- and
- a leveling member for spreading the toner particles in a thin layer on the surface on the developer roller.
A method of effecting jump development in an electrophotographic system comprising:
- providing a toner supply comprising a mixture of toner particles and large and small additive particles wherein the large additive particles have a mean diameter in a range from about 20 nm to about 50 nm and are present in an amount sufficient to provide surface coverage of the toner particles in a range from about 5 percent to about 50 percent and the small additive particles have a mean diameter in a range from about 6 nm to about 12 nm and are present in an amount sufficient to provide surface coverage of the toner particles in a range from about 58 percent to about 150 percent;
- applying the toner particles with the additive particles to a developer roller;
- leveling the toner particles on the surface of the developer roller to provide a thin layer of toner particles;
- and
- selectively transferring toner particles from the surface of the developer roller to charged areas in a charge image on the surface of an adjacent member by jump development to produce a toner image.
Dependencies are inferred from the claim text.