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:
Jun. 29, 2010
Filed:
Dec. 28, 2005
Makoto Iwamura, Yokohama, JP;
Naoki Hirakawa, Yokohama, JP;
Masashi Yamazaki, Yokohama, JP;
Hitoshi Shirasaka, Yokohama, JP;
Makoto Iwamura, Yokohama, JP;
Naoki Hirakawa, Yokohama, JP;
Masashi Yamazaki, Yokohama, JP;
Hitoshi Shirasaka, Yokohama, JP;
Synztec Co., Ltd., Tokyo, JP;
Abstract
A conductive roller which can form images of consistent quality and does not cause image failures such as formation of blank spots and a method for inspecting the roller. The conductive roller having a metallic core and at least one rubber elastic layer provided on the outer peripheral surface of the core, the rubber elastic layer being formed from a conductive rubber to which conductivity has been imparted by carbon powder, wherein the conductive roller satisfies the relationship represented by formula (1):≧5  (1),wherein Zr (Ω) represents a resistance component and Zc (Ω) represents a capacitive reactance component, the resistance component Zr (Ω) and the capacitive reactance component Zc (Ω) being calculated respectively from impedance Z (Ω) and phase difference θ, when the impedance Z (Ω) is measured upon application of an AC voltage of 0.2 V at a frequency of 1 Hz to the rubber elastic layer.