Photoreceptor Pre-rotation Stabilization for Image Quality
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Solution Overview
Problem
Image-forming devices with electrophotographic systems face challenges in maintaining high image quality and stability due to abrasion of organic photoreceptors, particularly during the pre-rotation process, leading to uneven toner image density and potential image failure.
Innovation Solution
An image-forming apparatus with a photoreceptor that includes a pre-rotation process where the photoreceptor is rotated without transfer bias, charged, and neutralized with neutralization light, maintaining the process until the charge potential reaches a predetermined value and the temporal change in potential becomes stable, ensuring the residual electrical potential is stabilized before starting the image-forming process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the image-forming process starts before the residual potential is stabilized, then the productivity is improved, but the image quality becomes uneven and unreliable
Solution Approach 1:
The patent applies preliminary action by performing a pre-rotation process before the image-forming process. During this pre-rotation, the photoreceptor is rotated without transferring toner, allowing the residual electrical potential to stabilize before actual image formation begins. This ensures that when the image-forming process starts, the photoreceptor surface is in a stable state, preventing uneven toner image density while maintaining efficient operation.
2Reliability
If the pre-rotation process is extended to stabilize residual potential, then the image quality is improved, but the photoreceptor wear increases
Solution Approach 1:
The pre-rotation process is implemented as a preliminary action with a controlled number of rotations (typically 1-5 rotations) sufficient to stabilize the residual potential without causing excessive wear. This limited pre-rotation achieves the necessary stabilization while minimizing the duration of photoreceptor operation without toner transfer, thereby extending photoreceptor life.
Solution Approach 2:
The patent applies partial action by performing only the minimum necessary pre-rotation (1-5 rotations) required to stabilize the residual potential, rather than extending the pre-rotation indefinitely. This partial action achieves the stabilization goal while avoiding excessive photoreceptor wear that would result from prolonged pre-rotation.
3Productivity
If the organic photoreceptor is used repeatedly, then the productivity is maintained, but the abrasion resistance decreases leading to image degradation
Solution Approach 1:
The pre-rotation process serves as a preliminary action that stabilizes the photoreceptor surface before each image-forming cycle or after extended operation. This stabilization prevents uneven charge distribution that would accelerate wear during toner transfer, thereby maintaining both productivity and abrasion resistance during continuous operation.
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 prevents image quality degradation and extends the life of the photoreceptor by ensuring the image-forming process begins only when the residual potential is stabilized, resulting in improved image density and reduced photoreceptor wear.
Implementation Method 1
a charging device configured to charge a surface of the photoreceptor to be a target charge potential
Implementation Method 2
an exposure device configured to expose a charged portion on the surface of the photoreceptor to form an electrostatic latent image
Implementation Method 3
a neutralization device configured to neutralize the surface of the photoreceptor by irradiating the surface with neutralization light after the transferring
Data Source
AI summary
An image-forming apparatus, comprising: a rotatable photoreceptor; a charging device configured to charge a surface of the photoreceptor to be a target charge potential; an exposure device configured to expose a charged portion on the surface of the photoreceptor to form an electrostatic latent image; a developing device configured to develop the electrostatic latent image using toner to form a toner image; a transfer device configured to apply a transfer bias between the photoreceptor and a transfer member by applying an electrical potential of opposite polarity to the target charge potential to the transfer member facing the photoreceptor, and which transfers the toner image on the photoreceptor onto a body to be transferred by the transfer bias; a neutralization device configured to neutralize the surface of the photoreceptor by irradiating the surface with neutralization light after the transferring; and a pre-rotation device configured to perform a pre-rotation process.