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:
Dec. 25, 2007
Filed:
Aug. 02, 2005
Akinori Toyoda, Katano, JP;
Kazumasa Hayashi, Kobe, JP;
Akinobu Okuda, Toyonaka, JP;
Masao Ootsuka, Sakai, JP;
Asao Toda, Kurume, JP;
Hideki Yasuda, Toyonaka, JP;
Akinori Toyoda, Katano, JP;
Kazumasa Hayashi, Kobe, JP;
Akinobu Okuda, Toyonaka, JP;
Masao Ootsuka, Sakai, JP;
Asao Toda, Kurume, JP;
Hideki Yasuda, Toyonaka, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
The present invention provides a one-component development type developing apparatus including a rotatable electrostatic latent image holding memberon the surface of which an electrostatic latent image is formed, and using a tonerfor rendering the electrostatic latent image visible, wherein when the shape factor SF-1 of a toner fine particle is expressed by:-1=()×(π/4)×100where A is the projected area of the fine particle and M is the absolute maximum length of the fine particle, then the shape factor SF-1 of the toneris at least 100 and at most 140, and the developing apparatus includes: a toner holding memberthat is formed from a silicone rubber elastic material and that is for holding the tonerand transporting it to the electrostatic latent image holding member; a toner layer regulating memberfor forming the toner on the toner holding memberinto a thin layer; and a toner supply memberthat is formed from a silicone rubber foam and that rotates, in a position opposed to the toner holding member, in a direction opposite to that of the toner holding member, and an AC electric field is formed between the toner holding memberand the toner supply member