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. 22, 2011
Filed:
Mar. 30, 2007
Teruyuki Mitsumori, Yokohama, JP;
Kozo Ishio, Odawara, JP;
Hiroaki Takamura, Odawara, JP;
Masaya Ota, Joetsu, JP;
Shiho Sano, Joetsu, JP;
Takeshi Oowada, Joetsu, JP;
Masakazu Sugihara, Joetsu, JP;
Teruki Senokuti, Joetsu, JP;
Shiro Yasutomi, Joetsu, JP;
Yumi Hirabaru, Joetsu, JP;
Teruyuki Mitsumori, Yokohama, JP;
Kozo Ishio, Odawara, JP;
Hiroaki Takamura, Odawara, JP;
Masaya Ota, Joetsu, JP;
Shiho Sano, Joetsu, JP;
Takeshi Oowada, Joetsu, JP;
Masakazu Sugihara, Joetsu, JP;
Teruki Senokuti, Joetsu, JP;
Shiro Yasutomi, Joetsu, JP;
Yumi Hirabaru, Joetsu, JP;
Mitsubishi Chemical Corporation, Tokyo, JP;
Abstract
To provide an image forming apparatus which is able to improve image quality while suppressing soiling of image white parts, scattering in the apparatus, streaks, fading, etc. due to non-uniformity in the particle size distribution of a toner or mismatching between a toner and a photoreceptor, and which has good cleaning properties, and even when a high speed printing machine is used, is able to reduce a problem of soiling, etc. in long-term use and provide excellent image stability. An image forming apparatus comprising an electrophotographic photoreceptor having a photosensitive layer on an electroconductive substrate, and a toner for developing an electrostatic charge image, wherein the photosensitive layer of the electrophotographic photoreceptor contains a phthalocyanine obtained via an acid paste step; the toner for developing an electrostatic charge image is a toner for developing an electrostatic charge image containing toner matrix particles formed in an aqueous medium; the toner has a volume median diameter (Dv50) of from 4.0 μm to 7.0 μm; and the relationship between the volume median diameter (Dv50) and the percentage in number (Dns) of toner particles having a particle diameter of from 2.00 μm to 3.56 μm satisfies the following formula (1):≦0.233 EXP(17.3/50)  (1).