Developing method of electrostatic latent images for full color image formation
AssigneeMinolta Camera Kabushiki Kaisha
InventorsIchiro Demizu, Mitsutoshi Nakamura, Hiroshi Fukao, Yuji Shintani, Shinobu Nakasawa
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Abstract
This invention relates to a developing method for electrostatic latent images for developing the electrostatic latent images retained on an electrostatic latent image retaining member, comprising a step of supplying a specified developer; a step of transferring the developer to a developing area; and a step of developing the electrostatic latent images formed on the electrostatic latent image retaining member in the development area under a specified development bias voltage.
Claims16
A developing method for electrostatic latent images for developing the electrostatic latent images retained on an electrostatic latent image retaining member, comprising
- a step of supplying a developer comprising
- a toner comprising a polyester resin with 2500.ltoreq.Mn.ltoreq.12000, 2.ltoreq.Mw/Mn.ltoreq.6, 50.degree. C..ltoreq.Tg.ltoreq.70.degree. C. and 80.degree. C..ltoreq.Tm.ltoreq.120.degree. C. and a coloring agent,
- a carrier comprising a magnetic core material coated with a thermosetting resin in which a styrene-acrylate copolymer resin and melamine resin are crosslinked, and
- an external additive comprising a hydrophobic silica and a hydrophobic titanium oxide or a hydrophobic silica and a hydrophobic aluminum oxide on a developer retaining member of non-magnetic property which contains a magnetic member in it and is arranged oppositely t o the electrostatic latent image retaining member;
- a step of transporting the developer to a developing area which is formed in an opposite portion of the electrostatic latent image retaining member to the developer retaining member;
- and
- a step of developing the electrostatic latent images formed on the electrostatic latent image retaining member in the development area under a development bias in which an alternating current component with a frequency of 1000 to 3500 Hz and peak-to-peak voltage of 300 to 2500 V is superposed on a direct current component, wherein the frequency (f) and the peak-to-peak voltage (V.sub.p-p) have the relation of equation below:
- V.sub.p-p f+500 [I].
A developing method for electrostatic latent images for developing the electrostatic latent images retained on an electrostatic latent image retaining member, comprising
- a step of supplying a developer comprising
- a color toner comprising a polyester resin with 2500.ltoreq.Mn.ltoreq.12,000, 2.ltoreq.Mw/Mn.ltoreq.6, 50.degree. C..ltoreq.Tg.ltoreq.70.degree. C. and 80.degree. C..ltoreq.Tm.ltoreq.120.degree. C. and a coloring agent selected from the group consisting of yellow colorants, magenta colorants and cyan colorants,
- a carrier comprising a magnetic core material coated with a thermosetting resin in which a styrene-acrylate copolymer resin and melamine resin are crosslinked, and
- an external additive comprising a hydrophobic silica and a hydrophobic titanium oxide or a hydrophobic silica and a hydrophobic aluminum oxide onto a developer retaining member of non-magnetic property which contains a magnetic member therein and is arranged oppositely to the electrostatic latent image retaining member;
- a step of transporting the developer to a developing area which is formed in an opposite portion of the electrostatic latent image retaining member to the developer retaining member;
- and
- a step of developing the electrostatic latent images formed on the electrostatic latent image retaining member in the development area under a development bias in which an alternating current component with a frequency of 1000 to 3500 Hz and peak-to-peak voltage of 300 to 2500 V is superposed on a direct current component, wherein the frequency (f) and the peak-to-peak voltage (V.sub.p-p) have the relation of equation below:
- V.sub.p-p .ltoreq.f+500 [I].
Dependencies are inferred from the claim text.