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US 11,442,376 B2Granted
Developing apparatus, process cartridge, and image forming apparatus
AssigneeCanon Kabushiki Kaisha
InventorsKazunari Hagiwara, Taichi Sato, Takahiro Kawamoto, Yasukazu Ikami, Shoko Funaki
Life of this patent
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Abstract
A developer used in a developing apparatus equipped with a metal blade includes a toner base particle and external additives, the external additives including a silica particle with a particle diameter of 5 nm or more and 25 nm or less and an inorganic spacer particle with a particle diameter of 50 nm or more and 150 nm or less, and an area occupancy of the silica particle on a surface of the toner base particle is 40% or more.
Claims14
A developing apparatus, comprising:
- a developing frame configured to store a developer;
- a developer bearing member rotatably supported by the developing frame and configured to bear the developer;
- and
- a regulation member including a metal blade, the metal blade having one end fixed to the developing frame and the other end arranged in contact with the developer bearing member, the regulation member regulating a thickness of the developer borne on the developer bearing member,
- wherein the developer includes a toner base particle and external additives,
- the external additives include a silica particle with a particle diameter of 5 nm or more and 25 nm or less, and an inorganic spacer particle with a particle diameter of 50 nm or more and 150 nm or less, and
- an area occupancy of the silica particle on a surface of the toner base particle is 40% or more.
4 more elements
Dependencies are inferred from the claim text.