Invention Grant
- Patent Title: Image forming apparatus and image forming method
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Application No.: US17112452Application Date: 2020-12-04
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Publication No.: US11372363B2Publication Date: 2022-06-28
- Inventor: Daisuke Inoue , Shinya Nakayama , Yohichi Kitagawa , Takaaki Tawada , Kenji Komito
- Applicant: RICOH COMPANY, LTD.
- Applicant Address: JP Tokyo
- Assignee: RICOH COMPANY, LTD.
- Current Assignee: RICOH COMPANY, LTD.
- Current Assignee Address: JP Tokyo
- Agency: Grüneberg and Myers PLLC
- Priority: JPJP2019-221412 20191206
- Main IPC: G03G21/00
- IPC: G03G21/00 ; G03G9/08 ; G03G9/10 ; G03G9/097
![Image forming apparatus and image forming method](/abs-image/US/2022/06/28/US11372363B2/abs.jpg.150x150.jpg)
Abstract:
An image forming apparatus is provided. The image forming apparatus includes an image bearer and a cleaning blade configured to remove toner particles remaining on the image bearer. The cleaning blade includes an elastic member in contact with a surface of the image bearer to remove the toner particles. The elastic member has a Martens hardness of from 3 to 8 N/mm2 when measured by a nanoindentation method with a load of 1 μN. The toner particles comprise toner base particles and an external additive, and the external additive comprise silica particles. A liberation ratio (Xs) of the silica particles liberated from the toner particles is from 40% to 75% when measured by an ultrasonic vibration method. A proportion (R70) of the silica particles having a volume-based particle diameter of 70 nm or more in the silica particles liberated from the toner particles is from 70% to 90% by number.
Public/Granted literature
- US20210173337A1 IMAGE FORMING APPARATUS AND IMAGE FORMING METHOD Public/Granted day:2021-06-10
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