Color Image Forming Apparatus Weak Exposure Control
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Solution Overview
Problem
In color image forming apparatuses using a common power source for both developing and charging units, maintaining optimal potential on photosensitive members is challenging due to variability in photosensitive characteristics, leading to issues like fogging and image uniformity problems.
Innovation Solution
The apparatus includes an acquisition unit to monitor the service life of photosensitive members and a control unit that adjusts the light beam emission of light beam units to optimize the potential by performing weak exposure on non-image areas and normal exposure on image areas, based on the service life information, to reduce potential variability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single common power source is used for both developing units and charging units, then the size and cost of the apparatus is reduced, but the potential of photosensitive members becomes difficult to optimize and variability in surface potential increases
Solution Approach 1:
The patent segments the light beam emission into two distinct modes: weak light beam emission for background areas and normal light beam emission for image areas. This segmentation allows differential control of exposure amounts based on the functional requirements of different regions on the photosensitive member, thereby compensating for the lack of independent power source control and reducing surface potential variability.
Solution Approach 2:
The patent applies local quality by adjusting the light beam emission characteristics specifically for background areas where toner images are not to be visualized. By performing weak exposure on background portions and normal exposure on image portions, the system optimizes the surface potential distribution locally, addressing the uniformity issue caused by the common power source configuration.
2Manufacturing precision
If weak light beam emission is performed on background areas to optimize potential, then surface potential uniformity is improved, but the complexity of light beam control increases
Solution Approach 1:
The patent implements dynamic control of the light beam emission unit, allowing it to switch between weak light beam emission mode for background areas and normal light beam emission mode for image areas. This dynamic adjustment is controlled based on service life information of the photosensitive member, enabling the system to adapt the exposure characteristics to maintain optimal surface potential uniformity throughout the photosensitive member's operational life.
Solution Approach 2:
The patent changes the exposure amount parameter of the light beam emission unit based on the service life information of the photosensitive member. By adjusting this parameter dynamically, the system compensates for aging effects and maintains consistent surface potential uniformity without requiring additional hardware 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
This approach ensures consistent image quality by maintaining optimal surface potential on photosensitive members, reducing fogging and improving image uniformity across the apparatus.
Implementation Method 1
light beam emission units for forming electrostatic latent images on the photosensitive members by emitting light beams thereto
Implementation Method 2
charging units configured to charge the photosensitive members
Implementation Method 3
developing units for visualizing toner images by applying toners to the electrostatic latent images
Data Source
AI summary
In a color image forming apparatus, the amount of light of an exposure unit for a weak exposure is changed according to a remaining service life of a photosensitive drum when the weak exposure is performed for the background area of a corresponding photosensitive drum by using the exposure unit.