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:
Jan. 12, 2010
Filed:
Feb. 09, 2007
Toshiaki Kagawa, Kitakatsuragi-gun, JP;
Hideki Ohnishi, Chiba, JP;
Hiroshi Kida, Yamatokoriyama, JP;
Yoshiaki Masuda, Nara, JP;
Toshiaki Kagawa, Kitakatsuragi-gun, JP;
Hideki Ohnishi, Chiba, JP;
Hiroshi Kida, Yamatokoriyama, JP;
Yoshiaki Masuda, Nara, JP;
Sharp Kabushiki Kaisha, Osaka, JP;
Abstract
The present invention is made to provide a pretransfer charging device, which allows (i) reduction of generation of discharge products such as ozone and nitroxide, (ii) excellent uniform charging, (iii) continuous stable charging for a long period of time, and (iv) restraint of distortion of a toner image. The pretransfer charging device includes (i) ion generation needles each provided face to face with an image carrier such as a photoconductor drum or an intermediating transfer belt, and (ii) a high-voltage power supply for applying a negative voltage to each of the ion generation needles. The voltage to be applied from the high-voltage power supply is not less than an ion production threshold voltage but is less than a corona discharge threshold voltage. With this, no corona discharge occurs but negative ions can be generated. This makes it possible to solve various problems caused due to the corona discharge.