Non-contact type non-magnetic monocomponent toner to develop electrostatic latent images and development unit using the same
AssigneeSamsung Electronics Co., Ltd.
InventorsDuck-hee Lee, Jong-moon Eun
Life of this patent
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Abstract
A non-contact type non-magnetic monocomponent toner to develop electrostatic latent images and a developing apparatus using the same. The toner includes toner particles containing a binding resin and coloring agents; and an external additive powder containing silicon oxide powder that has at least two kinds of particle sizes, separate inorganic compound powder, and zinc stearate. After passing a toner layer-regulating member, the toner evenly maintains a toner amount formed on a developing roller and forms a thin toner layer.
Claims26
A non-contact and non-magnetic monocomponent toner, comprising:
- a plurality of toner particles comprising at least a binding resin and a coloring agent;
- and
- an external additive powder, wherein:
- an acid value of the binding resin is below 12 mgKOH/g, and
- the external additive powder comprises:
- a silicon oxide powder including particles of first and second sizes,
- an inorganic compound powder, and
- zinc stearate.
A developing apparatus detachably mounted in a main body of an image-forming apparatus, the developing apparatus comprising:
- a non-contact and non-magnetic monocomponent developing agent, comprising:
- a plurality of toner particles including at least a binding resin and a coloring agent, and
- an external additive powder;
- a developing container to accommodate the non-contact and non-magnetic monocomponent developing agent;
- a photosensitive surface having a developing area;
- a developing roller to receive and transfer onto the developing area the non-contact and non-magnetic monocomponent developing agent accommodated in the developing container;
- and
- a toner layer regulating member to regulate a thickness of a layer of the developing agent received by the developing roller,
- wherein the external additive powder comprises:
- a silicon oxide powder including particles of first and second sizes,
- an inorganic compound powder, and
- zinc stearate, and
- a mass per unit area (M/A) of the layer of the developing agent received by the developing roller after regulated by the toner layer regulating member is between 0.4-0.9 mg/cm2.
A compound, comprising:
- a plurality of toner particles;
- and
- a powder, comprising:
- a silicon oxide powder including a plurality of particles of first and second sizes,
- an inorganic compound powder, and
- zinc stearate.
Dependencies are inferred from the claim text.