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:
Mar. 14, 2006
Filed:
Nov. 12, 2003
Takafumi Nagai, Higashiosaka, JP;
Tadayuki Sawai, Nara, JP;
Toshihisa Ishida, Kashiba, JP;
Kouji Kida, Kitakatsuragi-gun, JP;
Kazuya Korematsu, Nara, JP;
Toru Nishikawa, Yamatokoriyama, JP;
Yoshimi Kojima, Nara, JP;
Takafumi Nagai, Higashiosaka, JP;
Tadayuki Sawai, Nara, JP;
Toshihisa Ishida, Kashiba, JP;
Kouji Kida, Kitakatsuragi-gun, JP;
Kazuya Korematsu, Nara, JP;
Toru Nishikawa, Yamatokoriyama, JP;
Yoshimi Kojima, Nara, JP;
Sharp Kabushiki Kaisha, Osaka, JP;
Abstract
A non-magnetic mono-component toner of the present invention is composed of a coloring powder at least containing a binder resin, coloring agent and wax and at least one kind of external additive having a mean particle diameter of 0.04 μm or greater, wherein the relationship between the Vickers hardness of the above coloring powder and the mean particle diameter of the external additives satisfies the predetermined expression. Thereby, the present invention is effective in preventing the external additive particles from sinking into the toner surface as well as from falling off from the surface when the toner particles are stressed in the developing unit. As a result, it is possible to provide stable image quality free from degradation of toner charge performance and toner supply performance even for long-term use.