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The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.

The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.

Patent No.:

US 10990057 B1

PDFFull Text
Date of Patent:
Apr. 27, 2021

Filed:

Mar. 18, 2020

Image forming apparatus and process cartridge

Applicant:

Fuji Xerox Co., Ltd., Tokyo, JP;

Inventors:

Jun Sekiya, Kanagawa, JP;

Tatsuhiro Igarashi, Kanagawa, JP;

Yasuhisa Morooka, Kanagawa, JP;

Yuma Kubo, Kanagawa, JP;

Assignee:

FUJI XEROX CO., LTD., Tokyo, JP;

Attorney:

Sughrue Mion, PLLC

Primary Examiner:

Carla J Therrien

Int. Cl.
CPC ...
G03G 21/00 (2006.01); G03G 9/097 (2006.01); G03G 9/087 (2006.01); G03G 9/08 (2006.01); G03G 15/02 (2006.01);
U.S. Cl.
CPC ...
G03G 21/0017 (2013.01); G03G 9/0821 (2013.01); G03G 9/0825 (2013.01); G03G 9/0827 (2013.01); G03G 9/08711 (2013.01); G03G 9/09725 (2013.01); G03G 15/0216 (2013.01); G03G 21/0029 (2013.01); G03G 2221/0047 (2013.01);
Abstract

An image forming apparatus includes an image holding member; a charging unit; an electrostatic image forming unit; a developing unit that includes an electrostatic image developer including a toner and develops the electrostatic image formed on the surface of the image holding member with the electrostatic image developer to form a toner image; a transfer unit; and a cleaning unit that removes toner particles present on the surface of the image holding member. The cleaning unit includes a cleaning blade arranged to contact with the surface of the image holding member. The cleaning unit includes a cleaning blade A containing a contacting portion having a JIS-A hardness of 90° or more, or the cleaning unit includes a control unit B that controls a load with which the cleaning blade contacts with the image holding member, the control unit B controlling the load in a constant load mode. The toner includes toner particles; and silica particles having a number average particle size of 110 nm to 130 nm, a large-diameter-side number particle size distribution index (upper GSDp) of less than 1.080, and an average circularity of 0.94 to 0.98, wherein 80 number % or more of the silica particles have a circularity of 0.92 or more.

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