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.:
Date of Patent:
Nov. 26, 2019
Filed:
Mar. 01, 2019
Daisuke Inoue, Shizuoka, JP;
Takahiro Honda, Shizuoka, JP;
Masami Okamoto, Kanagawa, JP;
Kenta Kashiwagi, Kanagawa, JP;
Kaori Hemmi, Kanagawa, JP;
Yoshihisa Hara, Kanagawa, JP;
Daisuke Inoue, Shizuoka, JP;
Takahiro Honda, Shizuoka, JP;
Masami Okamoto, Kanagawa, JP;
Kenta Kashiwagi, Kanagawa, JP;
Kaori Hemmi, Kanagawa, JP;
Yoshihisa Hara, Kanagawa, JP;
Ricoh Company, Ltd., Tokyo, JP;
Abstract
An image forming apparatus including a developing device and a fixing device is provided. The fixing device includes a fixing rotator having a fixing surface, an opposing rotator opposing the fixing rotator to form a nip portion therebetween, and a fixing surface reformer having an abutting layer to abut the fixing surface. The abutting layer contains abrasive grains having an average grain size of 2.0-6.5 μm on a surface which abuts the fixing surface. The toner comprises a crystalline polyester resin and exhibits G' (storage elastic modulus) of 1.0×10Pa or lower at 70° C. in a temperature rising in a viscoelasticity measurement, G′ of 1.0×10Pa or higher at 70° C. in a temperature falling in the viscoelasticity measurement, and an endothermic peak indicating an amount of heat absorption of from 2.0 to 8.0 J/g, derived from the crystalline polyester resin, in a first temperature rising in DSC.