Invention Grant
- Patent Title: Electrostatic charge image developing carrier, electrostatic charge image developer, and image forming apparatus
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Application No.: US16945098Application Date: 2020-07-31
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Publication No.: US11561483B2Publication Date: 2023-01-24
- Inventor: Kazutsuna Sasaki , Yasuo Kadokura , Shintaro Anno , Satoshi Miura , Jumpei Iwasaki
- Applicant: FUJIFILM Business Innovation Corp.
- Applicant Address: JP Tokyo
- Assignee: FUJIFILM Business Innovation Corp.
- Current Assignee: FUJIFILM Business Innovation Corp.
- Current Assignee Address: JP Tokyo
- Agency: Sughrue Mion, PLLC
- Priority: JPJP2020-034175 20200228
- Main IPC: G03G9/113
- IPC: G03G9/113 ; G03G15/08 ; G03G9/08 ; G03G9/107

Abstract:
An electrostatic charge image developing carrier includes: magnetic particles; and a resin layer coating the magnetic particles and containing inorganic particles, in which an exposed area ratio of the magnetic particles is 0.1% or more and 4.0% or less, an average particle diameter of the inorganic particles is 5 nm or more and 90 nm or less, and a ratio B/A of a surface area B of the electrostatic charge image developing carrier to a plan view area A of the electrostatic charge image developing carrier is 1.020 or more and 1.100 or less when a surface of the electrostatic charge image developing carrier is three-dimensionally analyzed.
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