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Fujifilm Prescale Related Published Patent Summaries

Fujifilm Prescale Product Page >> Published Patent Summaries >> US8019258B2

Patent Publication Number: US 8019258 B2

Title: Developing apparatus

Filing Date: October 13, 2010

Priority Date: June 23, 2006

Inventor(s): Shinichi Nishida, Katsunori Yokoyama, Yasushi Shimizu, Kazunari Hagiwara, Katsuhiro Sakaizawa, Rie Endo, Naoto Kichijima

Original Assignee / Applicant(s): Canon Kabushiki Kaisha

Link to Patent: US8019258B2


The present invention discloses a developing apparatus used in an image forming apparatus employing an electro-photography method. A typical image development process involves an electrically charged developing roller contacting the developer material (toner) and forming a visible image, which is then transferred to a sheet or a paper. This invention discloses an apparatus wherein the amount of the developer material coming into contact with a developing roller is regulated with the use of a flexible sheet member that is stably retained in position with respect to a holding member and the developing roller with the help of a restoration force and an elastic force, respectively. This publication acknowledges the use of Fujifilm Prescale for measuring contact pressures that are greater than those generated / observed in the working of the present invention.