IMAGE FORMING APPARATUS AND IMAGE FORMING METHOD

PROBLEM TO BE SOLVED: To form a high-quality image without unevenness in image density, white void image, and image blur on a concavo-convex recording material irrespective of whether a toner is deteriorated or not.SOLUTION: An image forming apparatus measures the image density A of a transfer image...

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Bibliographic Details
Main Author IIMURA HARUO
Format Patent
LanguageEnglish
Japanese
Published 08.12.2016
Subjects
CINEMATOGRAPHY
ELECTROGRAPHY
ELECTROPHOTOGRAPHY
HOLOGRAPHY
MAGNETOGRAPHY
PHOTOGRAPHY
PHYSICS
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Summary:PROBLEM TO BE SOLVED: To form a high-quality image without unevenness in image density, white void image, and image blur on a concavo-convex recording material irrespective of whether a toner is deteriorated or not.SOLUTION: An image forming apparatus measures the image density A of a transfer image (S5) to determine whether the image density A is equal to or larger than a predetermined lower limit (S6); when a toner is not deteriorated, sets the waveform of a transfer bias to a waveform 1 (S7); and when the toner is deteriorated, sets the waveform of the transfer bias to a waveform 2 (S8). For example, the waveform 1 is a waveform to alternately apply a voltage having a polarity on a transfer side and a voltage having a polarity on a return side, and the waveform 2 is a waveform to alternately apply a voltage having only the polarity on a transfer side and an alternating voltage.SELECTED DRAWING: Figure 6 【課題】トナーが劣化した場合でも、劣化していない場合でも、凹凸のある記録材での画像濃度ムラや白抜け画像、画像のにじみの無い高品質な画像を形成する。【解決手段】転写画像の画像濃度Ａを計測し（Ｓ５）、画像濃度Ａが所定の下限値以上であるか否かを判断する（Ｓ６）。トナーが劣化していない場合は転写バイアスの波形を波形１に設定する（Ｓ７）。トナーが劣化している場合は転写バイアスの波形を波形２に設定する（Ｓ８）。波形１，波形２は、例えば、波形１を転写側の極性の電圧と戻し側の極性の電圧を交互に印加する波形とし、波形２は転写側の極性のみの電圧と、交番電圧とを交互に印加する波形とする。【選択図】図６
Bibliography:Application Number: JP20150084886