Charging Member Contamination Detection via Current Difference
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Solution Overview
Problem
In image forming apparatuses, contamination of charging members can lead to uneven charging of photoconductor drums, resulting in image density issues and errors like stripes, as existing techniques struggle to accurately and promptly detect contamination.
Innovation Solution
A device comprising multiple units with a measuring section to determine discharging current values, a calculating section to find differences between these values, and a determining section to assess contamination based on these differences, allowing for real-time detection and alerting of contaminated charging members.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If charging member contamination detection is performed using existing techniques, then contamination can be detected, but the detection accuracy and promptness are insufficient leading to image quality issues
Solution Approach 1:
A current value obtaining section is introduced as an intermediary measurement device to indirectly detect charging member contamination by measuring current values during the charging process. This mediator allows contamination detection without direct contact with the charging member, improving both detection accuracy and reliability while preventing image quality issues.
Solution Approach 2:
The system establishes a feedback loop where current values are continuously measured, compared against reference values, and used to determine contamination states. This feedback mechanism enables real-time contamination detection and prompt notification, ensuring image quality consistency by allowing timely maintenance actions.
2Reliability
If multiple measuring sections are used to improve detection accuracy, then contamination can be identified more reliably, but the device complexity increases
Solution Approach 1:
The measurement system is segmented into multiple independent measuring sections, each capable of measuring current values from different charging members. This segmentation allows reliable contamination detection by comparing results across multiple sections while maintaining modular simplicity, as each section operates independently with its own measuring and determining capabilities.
Solution Approach 2:
Each measuring unit is designed as a universal module that can measure current values from any charging member. The determining section universally compares current values against reference values and contamination determination results. This multi-functionality enables reliable detection across multiple charging members without proportionally increasing overall system complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables immediate detection and notification of contamination, preventing image quality issues by accurately identifying contaminated charging members during the image forming process, facilitating timely maintenance.
Implementation Method 1
a measuring section that measures a discharging current value between the charging member and the member to be charged
Data Source
AI summary
Provided is a charging member contamination determining device including plural units that includes a charging member, a member to be charged and a measuring section that measures a discharging current value between the charging member and the member to be charged, a calculating section that calculates a difference between current values measured by two units among the plural units, and a determining section that determines the presence or absence of contamination in the charging member based on the difference between the current values for each combination of two units calculated by the calculating section.