Back to results
US 7,366,448 B2Granted
Charging member including coated and uncoated metal oxide particles
AssigneesCanon Kabushiki Kaisha, Canon Kasei Kabushiki Kaisha
InventorsTomohito Taniguchi, Masaaki Harada, Hideyuki Takagi, Toshihiro Otaka, Yoshimasa Sawada
Life of this patent
Estimating the term…
Abstract
A charging member is disclosed having a support and at least one cover layer provided on the support., The cover layer has an outermost layer of the cover layer placed at the outermost surface of the charging member; the outermost layer contains i) composite particles composed of first metal oxide particles coated with carbon black, ii) second metal oxide particles and iii) a binder.
Claims19
A charging member comprising:
- a support;
- and
- at least one cover layer provided on said support,
- wherein said cover layer includes an outermost layer positioned at an outermost surface of the charging member,
- wherein said outermost layer contains (i) composite particles including first metal oxide particles coated with carbon black, (ii) second metal oxide particles uncoated with carbon black, and (iii) a binder,
- wherein said second metal oxide particles are insulating metal oxide particles, and
- wherein said composite particles and said second metal oxide particles are in a weight ratio of composite particles to second metal oxide particles in a range of 0.2 to 3.9.
4 more elements
A process cartridge comprising:
- an electrophotographic photosensitive member;
- and
- a charging member,
- wherein said electrophotographic photosensitive member and said charging member are integrally supported, and detachably mountable to a main body of an electrophotographic apparatus,
- wherein said charging member includes a support and at least one cover layer provided on said support,
- wherein said cover layer of said charging member includes an outermost layer positioned at an outermost surface of the charging member,
- wherein said outermost layer containing (i) composite particles including first metal oxide particles coated with carbon black, (ii) second metal oxide particles being uncoated with carbon black, and (iii) a binder,
- wherein said second metal oxide particles are insulating metal oxide particles, and
- wherein said composite particles and said second metal oxide particles are in a weight ratio of composite particles to second metal oxide particles in a range of 0.2 to 3.9.
6 more elements
An electrophotographic apparatus comprising:
- an electrophotographic photosensitive member,
- a charging member;
- an exposure means;
- a developing means;
- and
- a transfer means,
- wherein said charging member includes a support and at least one cover layer provided on said support;
- wherein said cover layer of said charging member includes an outermost layer positioned at an outermost surface of the charging member,
- wherein said outermost layer contains (i) composite particles including first metal oxide particles coated with carbon black, (ii) second metal oxide particles uncoated with carbon black, and (iii) a binder,
- wherein said second metal oxide particles are insulating metal oxide particles, and
- wherein said composite particles and said second metal oxide particles are in a weight ratio of composite particles to second metal oxide particles in a range of 0.2 to 3.9.
8 more elements
A charging member comprising:
- a support;
- and
- at least one cover layer provided on said support,
- wherein said cover layer includes an outermost layer positioned at an outermost surface of the charging member,
- wherein said outermost layer contains (i) composite particles including first metal oxide particles coated with carbon black, (ii) second metal oxide particles uncoated with carbon black, and (iii) a binder,
- wherein said second metal oxide particles are insulating metal oxide particles,
- wherein said composite particles and said second metal oxide particles are in a weight ratio of composite particles to second metal oxide particles in a range of 0.2 to 3.9,
- wherein an average particle diameter of said composite particles is in a range of 5 nm to 500 nm, and
- wherein a microhardness of the surface of the charging member is in a range of 53° to 76° .
6 more elements
A process cartridge comprising:
- an electrophotographic photosensitive member, and
- a charging member,
- wherein said electrophotographic photosensitive member and said charging member are integrally supported, and detachably mountable to a main body of an electrophotographic apparatus,
- wherein said charging member includes a support and at least one cover layer provided on said support,
- wherein said cover layer of said charging member includes an outermost layer positioned at an outermost surface of the charging member,
- wherein said outermost layer contains (i) composite particles including first metal oxide particles coated with carbon black, (ii) second metal oxide particles uncoated with carbon black, and (iii) a binder,
- wherein said second metal oxide particles are insulating metal oxide particles,
- wherein said composite particles and said second metal oxide particles are in a weight ratio of composite particles to second metal oxide particles in a range of 0.2 to 3.9,
- wherein an average particle diameter of said composite particles is in a range of 5 nm to 500 nm, and
- wherein a microhardness of the surface of the charging member is in a range of 53° to 76° .
7 more elements
An electrophotographic apparatus comprising:
- an electrophotographic photosensitive member;
- a charging member;
- an exposure means;
- a developing means;
- and
- a transfer means,
- wherein said charging member includes a support and at least one cover layer provided on said support,
- wherein said cover layer of said charging member includes an outermost layer positioned at an outermost surface of the charging member,
- wherein said outermost layer contains (i) composite particles including first metal oxide particles coated with carbon black, (ii) second metal oxide particles uncoated with carbon black, and (iii) a binder,
- wherein said second metal oxide particles are insulating metal oxide particles,
- wherein said composite particles and said second metal oxide particles are in a weight ratio of composite particles to second metal oxide particles in a range of 0.2 to 3.9,
- wherein an average particle diameter of said composite particles is in a range of 5 nm to 500 nm, and
- wherein a microhardness of the surface of the charging member is in a range of 53° to 76° .
10 more elements
Dependencies are inferred from the claim text.