IMAGE FORMING APPARATUS AND IMAGE FORMING METHOD

• Main Authors: IMANAKA YOSHITAKA, NISHIMURA KEIYA, ISHINO MASATO, FUJITA TOSHIKI
• Format: Patent
• Language: English; Japanese
• Published: 18.02.2021
• Subjects: CINEMATOGRAPHY; ELECTROGRAPHY; ELECTROPHOTOGRAPHY; HOLOGRAPHY; MAGNETOGRAPHY; PHOTOGRAPHY; PHYSICS

To provide an image forming apparatus that can prevent the occurrence of uneven charging.SOLUTION: An image forming apparatus comprises: an image carrier consisting of a conductive substrate and a single-layer photosensitive layer; and a charging roller 51 that charges a peripheral surface of the image carrier to a positive polarity. The charging roller 51 consists of a conductive shaft 51a, a base layer 51b, and a surface layer 51d. The charging ability of the image carrier X[V/(C/m2)] represented by the following formula (1) and the surface resistance Y[logΩ] of the surface layer 51d of the charging roller 51 satisfy the following formula (2). (1) X=V/(Q/S); (2) Y>5×10-11X2+1.062×10-5×X-47. (In the formula (1), Q represents the amount of electrified charge of the image carrier [C]. S represents the area of charging of the image carrier [m2].)SELECTED DRAWING: Figure 3 【課題】帯電ムラの発生を抑制できる画像形成装置を提供する。【解決手段】導電性基体と単層の感光層とからなる像担持体、および像担持体の周面を正極性に帯電させる帯電ローラー５１とを備え、前記帯電ローラー５１は、導電性シャフト５１ａ、基層５１ｂ、表層５１ｄとからなり、下記式（１）で表される前記像担持体の帯電能Ｘ［Ｖ／（Ｃ／ｍ2）］と、前記帯電ローラー５１の表層５１ｄの表面抵抗Ｙ［ｌｏｇΩ］とは、下記式（２）を満たす。Ｘ＝Ｖ／（Ｑ／Ｓ）・・・（１）、Ｙ＞５×１０-11Ｘ2＋１．０６２×１０-5×Ｘ−４７・・・（２）（式（１）中、Ｑは、前記像担持体の帯電電荷量［Ｃ］を表す。Ｓは、前記像担持体の帯電面積［ｍ2］を表す。）【選択図】図３