Particle adhesion preventing member, electric field forming member, and image forming apparatus
AssigneeCanon Kabushiki Kaisha
InventorsHideki Fujita, Kazushige Nishiyama, Koki Watanabe, Eikou Mori
Life of this patent
Estimating the term…
Abstract
A particle adhesion preventing member used for an image forming apparatus that forms an image using charged toner, and configured to prevent adhesion of the charged toner, includes a conductive member, and an insulating member that is attached to the conductive member, including a porous member made of an ethylene propylene diene ternary copolymer having a density of 0.01 g/cm3 or more and 0.2 g/cm3 or less or silicon having a density of 0.01 g/cm3 or more and 0.3 g/cm3 or less, and being negatively charged with negatively charged particles adhering onto a surface thereof.
Claims38
An image forming apparatus comprising:
- an image bearing member that moves while bearing a toner image;
- a developing device that includes a developer bearing member that bears charged toner and develops an electrostatic latent image formed on the image bearing member with toner;
- and
- an electric field forming member that forms an electric field between a surface thereof onto which the charged toner adheres and an opposed portion which opposes the electric field forming member in the image forming apparatus,
- wherein the electric field forming member includes a conductive member connected to ground, and an insulating member attached to the conductive member at a position opposite the opposed portion, the insulating member including a porous member made of an ethylene propylene diene ternary copolymer having a volume resistivity of 1010 Ω·cm or more and 1016 Ω·cm or less and a density of 0.01 g/cm3 or more and 0.2 g/cm3 or less, and
- wherein a normal charge polarity of the toner is in negative polarity and the porous member is negatively charged by being adhered with a negatively-charged toner.
An electric field forming member used for an image forming apparatus that forms an image using charged toner, and configured to form an electric field between a surface thereof onto which the charged toner adheres and an opposed portion which opposes the electric field forming member in the image forming apparatus, the electric field forming member comprising:
- a conductive member connected to ground;
- and
- an insulating member attached to the conductive member at a position opposite the opposed portion, the insulating member including a porous member made of an ethylene propylene diene ternary copolymer having a volume resistivity of 1010 Ω·cm or more and 1016 Ω·cm or less and a density of 0.01 g/cm3 or more and 0.2 g/cm3 or less, and
- wherein a normal charge polarity of the toner is in negative polarity and the porous member is negatively charged by being adhered with a negatively-charged toner.
An image forming apparatus comprising:
- an image bearing member that moves while bearing a toner image;
- a developing device that includes a developer bearing member that bears charged toner and develops an electrostatic latent image formed on the image bearing member with toner;
- and
- an electric field forming member that forms an electric field between a surface thereof onto which the charged toner adheres and an opposed portion which opposes the electric field forming member in the image forming apparatus,
- wherein the electric field forming member includes a conductive member provided to maintain a predetermined reference potential, and an insulating member attached to the conductive member at a position opposite the opposed portion, the insulating member including a porous member made of silicon having a volume resistivity of 1010 Ω·cm or more and 1016 Ω·cm or less and a density of 0.01 g/cm3 or more and 0.3 g/cm3 or less, and
- wherein a normal charge polarity of the toner is in negative polarity and the porous member is negatively charged by being adhered with a negatively-charged toner.
An electric field forming member used for an image forming apparatus that forms an image using charged toner, and configured to form an electric field between a surface thereof onto which the charged toner adheres and an opposed portion which opposes the electric field forming member in the image forming apparatus, the electric field forming member comprising:
- a conductive member provided to maintain a predetermined reference potential;
- and
- an insulating member attached to the conductive member at a position opposite the opposed portion, the insulating member including a porous member made of silicon having a volume resistivity of 1010 Ω·cm or more and 1016 Ω·cm or less and a density of 0.01 g/cm3 or more and 0.3 g/cm3 or less, and
- wherein a normal charge polarity of the toner is in negative polarity and the porous member is negatively charged by being adhered with a negatively-charged toner.
A developing device comprising:
- a developer bearing member configured to bear a developer including a toner and a carrier;
- a developing container rotatably supporting the developer bearing member, configured to contain a developer supplied to the developer bearing member;
- an electric field forming member provided to the developing container so as to oppose to the developer bearing member, configured to form an electric field between a surface thereof onto which a charged toner adheres,
- a conductive member;
- and
- an insulating member attached to the conductive member at a position opposite the opposed portion, the insulating member including a porous member made of an ethylene propylene diene ternary copolymer having a volume resistivity of 1010 Ω·cm or more and 1016 Ω·cm or less and a density of 0.01 g/cm3 or more and 0.2 g/cm3 or less, and
- wherein a normal charge polarity of the toner is in negative polarity and the porous member is negatively charged by being adhered with a negatively-charged toner.
A developing device comprising:
- a developer bearing member configured to bear a developer including a toner and a carrier;
- a developing container rotatably supporting the developer bearing member, configured to contain a developer supplied to the developer bearing member;
- an electric field for forming member provided to the developing container so as to oppose to the developer bearing member, configured to form an electric field between a surface thereof onto which a charged toner adheres,
- wherein the electric field forming member comprising:
- a conductive member;
- and
- an insulating member attached to the conductive member at a position opposite the opposed portion, the insulating member including a porous member made of silicon having a volume resistivity of 1010 Ω·cm or more and 1016 Ω·cm or less and a density of 0.01 g/cm3 or more and 0.3 g/cm3 or less,
- wherein a normal charge polarity of the toner is in negative polarity and the porous member is negatively charged by being adhered with a negatively-charged toner.
Dependencies are inferred from the claim text.