IMAGE FORMATION DEVICE

• Main Authors: ANDO MASATO, KITAZAWA KAZUKI, KIJIMA MASARU, INABA NOBUHIDE, OMORI MASAO, KOBAYASHI JUNICHI
• Format: Patent
• Language: English; Japanese
• Published: 22.03.2019
• Subjects: CINEMATOGRAPHY; ELECTROGRAPHY; ELECTROPHOTOGRAPHY; HOLOGRAPHY; MAGNETOGRAPHY; PHOTOGRAPHY; PHYSICS

To enhance detection accuracy of wear-out in comparison with the case where an exposure is made as shifting a divided area in an exposure step when detecting the wear-out of an image holding body from a profile of a recharging current.SOLUTION: An image formation device includes: an image holding body that rotates around a rotary axis; charging means that causes a surface of the image holding body to be charged; measurement means that measures a flowing charging current upon charging; exposure means that irradiates the image holding body having the surface charged with light to expose the image holding body, and forms an electrostatic latent image; and detection means that controls the charging means so as to cause the surface of the image holding body to be subjected to an initial charging, controls the exposure means so as to expose the surface of the charged image holding body as moving an irradiation area of the light of a predetermined width in a rotary axis direction along the rotary axis and form an exposure area, controls the measurement means so as to measure a flowing recharging current when causing the charging means to charge the surface of the exposed image holding body once again, and detects abnormality of the image holding body using the recharging current.SELECTED DRAWING: Figure 1 【課題】再帯電電流のプロファイルから像保持体の磨耗を検知する場合の露光工程において、分割された領域をずらしながら露光する場合と比較して、磨耗の検知精度をより高くすること。【解決手段】回転軸を中心として回転する像保持体と、像保持体の表面を帯電させる帯電手段と、帯電時に流れる帯電電流を測定する測定手段と、表面を帯電された像保持体に光を照射して露光し静電潜像を形成する露光手段と、像保持体の表面を初期帯電させるように帯電手段を制御し、回転軸方向の予め定められた幅の光の照射領域を回転軸に沿って移動させつつ帯電された像保持体の表面を露光し露光領域を形成するように露光手段を制御し、露光された像保持体の表面を再度帯電手段により帯電させたときに流れる再帯電電流を測定するように測定手段を制御し、再帯電電流を用いて像保持体の異常を検知する検知手段と、を含む。【選択図】図１