Exposure Control via Current Measurement in Image Forming Apparatus
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Solution Overview
Problem
Current image forming apparatuses lack the capability to detect improper exposure and effectively control exposure levels, leading to insufficient exposure of the photosensitive body.
Innovation Solution
An image forming apparatus equipped with a photosensitive body, a charger, an exposure unit, a developer transport section, and a current measurement section, which measures the current flowing between the photosensitive body and the developer transport section to determine proper exposure by comparing the measured current with a threshold, and adjusts the exposure accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If current measurement is performed to detect improper exposure, then exposure detection capability is improved, but device complexity increases
Solution Approach 1:
The current measurement section, originally designed for detecting transfer unit abnormalities, is made multi-functional by enabling it to detect both transfer unit issues and exposure problems through different measurement modes, thereby improving exposure detection capability without adding dedicated new components
Solution Approach 2:
The system uses its existing current measurement infrastructure to serve the additional function of exposure detection, allowing the apparatus to self-diagnose exposure issues using components already present in the system, thus avoiding increased device complexity
2Manufacturing precision
If exposure control is implemented based on current measurement, then image formation quality is improved, but device complexity increases
Solution Approach 1:
The system implements feedback control by measuring the current flowing between the photosensitive body and developer transport section, comparing it with threshold values, and adjusting exposure conditions based on the comparison result, thereby improving image formation quality through automated exposure control
Solution Approach 2:
The exposure control is achieved by adjusting exposure parameters (such as exposure amount or timing) based on the measured current values, allowing the system to optimize image formation quality by dynamically changing exposure parameters rather than adding complex hardware
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 reliable detection of improper exposure and subsequent control of the exposure process, ensuring sufficient charge reduction on the photosensitive body and maintaining precise exposure levels, thereby improving image formation quality.
Implementation Method 1
a charger (29), which charges the photosensitive body (28)
Implementation Method 2
an exposure unit (19), which exposes the charged photosensitive body (28) to light emitted from a light source (33)
Implementation Method 3
a current measurement section (56), which measures a current flowing between the photosensitive body (28) and the developer transport section (25)
Data Source
AI summary
An image forming apparatus including a photosensitive body, a charger configured to charge the photosensitive body, an exposure unit configured to expose the photosensitive body charged by the charger, a developer transport section configured to cause relative movement with respect to the photosensitive body for transporting developer therebetween, a current measurement section configured to measure a current flowing between the photosensitive body and the developer transport section, and a determination unit configured to compare a current with a threshold, the current measured by the current measurement section when the photosensitive body and the developer transport section move relatively to each other and a first area of the photosensitive body that needs to be exposed faces the developer transport section, and determine whether an exposure of the photosensitive body is proper based on a result of the comparison.