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:
Jul. 16, 2013
Filed:
May. 23, 2011
Nofumi Mizumoto, Nara, JP;
Takeshi Maeyama, Ikeda, JP;
Junya Hirayama, Takarazuka, JP;
Shigeo Uetake, Takatsuki, JP;
Makiko Watanabe, Uji, JP;
Toshiya Natsuhara, Takarazuka, JP;
Nofumi Mizumoto, Nara, JP;
Takeshi Maeyama, Ikeda, JP;
Junya Hirayama, Takarazuka, JP;
Shigeo Uetake, Takatsuki, JP;
Makiko Watanabe, Uji, JP;
Toshiya Natsuhara, Takarazuka, JP;
Konica Minolta Business Technologies, Inc., Chiyoda-Ku, Tokyo, JP;
Abstract
A developer device includes two developer rollers arranged opposite to an image carrier. A first developer bias voltage (waveform Z) of a rectangular waveform obtained by superimposing an AC voltage on a DC voltage is applied to one of the developer rollers. A second developer bias voltage (waveform A) obtained by superimposing an AC voltage on a DC voltage is applied to the other developer roller. The waveform A is a waveform obtained by deforming the rectangular wave in the first developer bias voltage such that toner adhered to the image carrier is prevented from being dislodged by toner being subsequently scattered. According to the developer device, an optimal image density can be obtained at a low-density potential.