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. 25, 1994
Filed:
May. 19, 1993
Yoshio Ogura, Ibaraki, JP;
Yasuyuki Tsuji, Ibaraki, JP;
Shuuho Yokokawa, Ibaraki, JP;
Kunitomo Takahashi, Ibaraki, JP;
Isao Nakajima, Ibaraki, JP;
Muneyoshi Akai, Ibaraki, JP;
Hiroshi Ueno, Ibaraki, JP;
Isao Watanabe, Ibaraki, JP;
Tsukasa Onose, Ibaraki, JP;
Hitachi Koki Co., Ltd., Tokyo, JP;
Abstract
A toner density detection method for an electrophotographic apparatus in which driving of a rotary roll provided at an outlet of a special vessel is continued for a predetermined period of time (e.g., several seconds) after the operation of the electrophotographic apparatus is stopped. All or substantially all of the developing agent is thus exhausted or removed from the special vessel after the electrophotographic apparatus is stopped, so that the true permeability of the developing agent can be detected by a permeability sensor when the operation of the electrophotographic apparatus is restarted. As a result, the toner density of the developing agent can be controlled and kept normal, so that the printing quality can be stabilized.