Image forming apparatus

By alternately applying charged voltages of different polarities in the image forming apparatus, the problem of image unevenness caused by contamination of charged rollers is solved, and effective toner transfer and cleaning are achieved, improving image quality and cleaning effect.

CN116794953BActive Publication Date: 2026-06-09CANON KK
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
CANON KK
Filing Date
2023-03-17
Publication Date
2026-06-09

AI Technical Summary

Technical Problem

In image forming apparatuses without cleaners, toner contamination on the charged rollers leads to uneven image formation. Existing technologies struggle to effectively clean the surface of the charged rollers, especially when the toner polarity reverses, increasing adhesion and making it difficult to transfer the toner to the photosensitive drum surface.

Method used

By alternately applying charged voltages to the charged components during non-image forming operations, including applying voltages of different polarities to the charged components, a potential difference is created between the charged roller and the photosensitive drum, enabling effective transfer and cleaning of the toner and avoiding toner contamination.

Benefits of technology

It effectively prevents toner contamination from the electrified roller, ensures the uniformity and quality of image formation, reduces image density unevenness, and improves the cleaning performance of the image forming device.

✦ Generated by Eureka AI based on patent content.

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Abstract

An image forming apparatus is disclosed. An image forming apparatus, wherein, in a non-image forming operation, a control unit performs the following control process: i) does not discharge electric charges between a charging member and an image bearing member, and applies a first voltage having a first polarity with respect to a potential on the image bearing member to the charging member; ii) after the process of i) is performed, applies a second voltage having a polarity opposite to the first polarity with respect to the potential; and iii) after the process of ii) is performed, controls to apply a third voltage having a second polarity with respect to the potential to the charging member, and controls to apply a fourth voltage having a polarity opposite to the second polarity with respect to the potential to the charging member, and controls to discharge electric charges between the charging member and the image bearing member.
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