Photosensitive Drum Exposure Control During Maintenance Door Opening
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Solution Overview
Problem
Existing image forming apparatuses risk forming unintended latent images on the photosensitive drum when the maintenance door is opened during an image formation job due to continuous light exposure, leading to unwanted images on the recording medium.
Innovation Solution
The apparatus includes a detection unit to sense the opening of the maintenance door, causing the output unit to control the light emitting portions to turn off and maintaining power to the drive unit, ensuring the photosensitive drum stops rotating and the light emitting elements remain off until the door is closed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the light emitting portions continue to expose the photosensitive drum after the drum stops rotating due to maintenance door opening, then the exposure operation can be completed, but unintended latent images are formed on the photosensitive drum surface
Solution Approach 1:
The detection unit detects the maintenance door opening state in advance, and the control unit preemptively controls the light emitting portions to stop exposure before the drum completes its rotation. This preliminary action prevents the harmful effect of unintended latent image formation while allowing the exposure operation to be safely interrupted
Solution Approach 2:
The detection unit provides real-time feedback about the maintenance door opening state to the control unit, which then adjusts the light emitting portions accordingly. This feedback mechanism ensures that exposure is stopped when the drum stops rotating, preventing unintended latent image formation while maintaining operational awareness
2Reliability
If power is interrupted to the drive unit when the maintenance door is opened, then safety is improved, but device complexity and potential breakdown risks increase
Solution Approach 1:
Instead of interrupting power to the entire drive unit, the solution selectively controls only the light emitting portions to stop exposure. This localized control approach maintains safety by preventing latent image formation while avoiding the complexity and potential breakdown risks associated with complete power interruption to the drive unit
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 prevents unintended latent image formation on the photosensitive drum, maintaining operational safety and preventing unwanted images, while reducing potential breakdown risks and cost increases associated with power interruptions.
Implementation Method 1
a plurality of light emitting portions arranged along the rotation shaft of the photosensitive drum and configured to expose to light the surface of the photosensitive drum charged by the charging unit to form a latent image on the surface of the photosensitive drum
Implementation Method 2
an image forming apparatus configured to form a latent image on a surface of a photosensitive drum by exposing the photosensitive drum to light emitted from an exposure head including an organic light emitting diode (OLED) as a light source
Data Source
AI summary
An image forming apparatus includes a plurality of light emitting portions configured to expose to light a photosensitive drum, a detection unit configured to detect an opening of a maintenance door, a output unit configured to output image data for controlling turning on and off of the plurality of light emitting portions, a drive unit configured to drive the plurality of the light emitting portions based on the image data, wherein the photosensitive drum stops rotating when the detection unit detects that the maintenance door is open, wherein the output unit output the image data indicating turning off of the plurality of light emitting portions when the detection unit detects that the maintenance door is open, and a power supplied to the drive unit is maintained in a case where the maintenance door is opened.