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:
Oct. 31, 1995
Filed:
Apr. 21, 1994
Takahiro Inoue, Yokohama, JP;
Masahiro Goto, Yokohama, JP;
Hiroshi Sasame, Yokohama, JP;
Shinichi Tsukida, Okegawa, JP;
Manabu Takano, Tokyo, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
A charging apparatus for electrically charging a member to be charged includes a charging member contactable to the member to be charged to electrically charge the member to be charged. The member to be charged includes a core. A voltage source for applying an oscillating voltage between the member to be charged and the charging member such that a frequency f (Hz) of the oscillating voltage, a Young's modulus E.sub.1 (N/m.sup.2) of the member to be charged, a Young's modulus E.sub.2 of the cure an outer circumferential length 1 (m) of the member to be charged, a thickness t.sub.1 (m) of the member to be charged, and a thickness t.sub.2 of the core satisfy: f1.sup.2 /E.sub.1 t.sub.1.sup.3 +E.sub.2 t.sub.2.sup.3<1.5.times.10.sup.-2 Hz.m (200<f>1500 Hz)