Electrophotographic image forming method

Patent metadata

Field	Value
Publication number	US-2016291503-A1
Application number	US-201615074191-A
Country	US
Kind code	A1
Filing date	Mar 18, 2016
Priority date	Mar 30, 2015
Publication date	Oct 6, 2016
Grant date	—

Abstract

An electrophotographic image forming method includes: performing a reversal development process using an electrophotographic photoreceptor including a conductive support, and an undercoat layer, a photosensitive layer, and a surface protective layer, which are at least provided on the conductive support, wherein the surface protective layer includes at least a cured resin and a component capable of influencing frequency dependence of impedance, and the undercoat layer includes at least a metal oxide and has a thickness in the range of 1 to 30 μm; and performing an electrostatic discharge step including applying an AC voltage at 2 kHz or more, wherein the frequency of the AC voltage is increased depending on use history.

First claim

What is claimed is:

1 . An electrophotographic image forming method comprising:
performing a reversal development process using an electrophotographic photoreceptor comprising a conductive support, and an undercoat layer, a photosensitive layer, and a surface protective layer, which are at least provided on the conductive support, wherein the surface protective layer comprises at least a cured resin and a component capable of influencing frequency dependence of impedance, and the undercoat layer comprises at least a metal oxide and has a thickness in the range of 1 to 30 μm; and performing an electrostatic discharge step comprising applying an AC voltage at 2 kHz or more, wherein the frequency of the AC voltage is increased depending on use history.

2 . The electrophotographic image forming method according to claim 1 , wherein the component capable of influencing frequency dependence of impedance is fine particles comprising at least tin oxide, zinc oxide, titanium oxide, or aluminum oxide or fine particles comprising a fluororesin.

3 . The electrophotographic image forming method according to claim 1 , wherein the cured resin is a resin obtained by polymerization of a polymerizable monomer having at least an acryloyl or methacryloyl group in its molecule.

4 . The electrophotographic image forming method according to claim 1 , wherein the cured resin comprises fluororesin fine particles and a fluoroalkyl group-containing resin.

5 . The electrophotographic image forming method according to claim 1 , wherein the metal oxide contained in the undercoat layer is in the form of fine particles comprising at least tin oxide, zinc oxide, titanium oxide, or aluminum oxide.

6 . The electrophotographic image forming method according to claim 1 , wherein the photosensitive layer has a layer comprising at least a charge generation material, wherein the charge generation material comprises at least Y-titanylphthalocyanine.

7 . The electrophotographic image forming method according to claim 1 , wherein in the electrostatic discharge step, a DC voltage with the same polarity as the polarity of electrostatic charge on the electrophotographic photoreceptor is applied in addition to the AC voltage.

8 . The electrophotographic image forming method according to claim 1 , wherein in the electrostatic discharge step, light for electrostatic discharge is applied simultaneously with the application of the AC voltage.

9 . The electrophotographic image forming method according to claim 7 , wherein in the electrostatic discharge step, light for electrostatic discharge is applied simultaneously with the application of the AC voltage and the DC voltage.

Assignees

• Konica Minolta Inc

Inventors

• Kudoh Koichi

Classifications

• G03G21/06 Primary

  Eliminating residual charges from a reusable imaging member · CPC title

• G03G15/75

  Details relating to xerographic drum, band or plate, e.g. replacing, testing (electrographic recording members per se G03G5/00) · CPC title

• G03G15/08 Primary

  using a solid developer, e.g. powder developer · CPC title