Light Quantity Lowering Member for Photosensitive Drum End Abrasion

The patent applies local quality by differentiating the light quantity lowering degree across different regions of the photosensitive drum. The light quantity lowering member is configured to reduce the quantity of reflected discharging light more at the end portions (first and second regions) than at the central portion (third region). This localized differentiation allows sufficient light for residual charge removal at the center while suppressing excessive light at the ends where electric discharge occurs, thereby resolving the contradiction between suppressing electric discharge and maintaining adequate illumination for charge removal.

The patent applies parameter changes by modifying the light quantity parameter of reflected discharging light at different radial positions of the photosensitive drum. By reducing the light quantity of reflected discharging light at the end portions where electric discharge is excessive, the potential difference between the charging roller and photosensitive drum surface is reduced, thereby suppressing electric discharge and preventing abrasion. This parameter modification allows the contact charging method to maintain its high charging efficiency while protecting the photosensitive drum surface durability.

The patent implements local quality by creating spatially differentiated light quantity lowering. The light quantity lowering member is specifically configured to reduce reflected discharging light quantity at the end portions (first and second regions) while maintaining or minimally affecting the light quantity at the central portion (third region). This localized approach suppresses electric discharge at the problematic end portions while preserving the effectiveness of residual charge removal across the entire photosensitive drum surface, particularly at the central region where uniform charging and effective charge removal are critical.