Image Forming Apparatus Light Emission Unit Positioning
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Solution Overview
Problem
Conventional image forming apparatuses with LED arrays positioned at the top cover face challenges in maintaining high precision printing due to positional accuracy degradation during cartridge replacement, increased user load, and exposure surface damage risks.
Innovation Solution
An image forming apparatus with a light emission unit disposed close to the photosensitive drum, featuring a regulation member to prevent perpendicular movement during cartridge insertion and a belt contact configuration that ensures the LED unit is upstream from the image forming position, reducing contact risks and maintaining precision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the LED array is disposed at the top cover to enable cartridge replacement, then cartridge replacement usability is improved, but positional accuracy between the photosensitive drum and LED array degrades
Solution Approach 1:
The LED array is extracted from the top cover and relocated to the apparatus main body, separating the light emission function from the movable cover structure. This extraction eliminates the positional accuracy degradation that occurs during cover opening/closing operations while maintaining cartridge replacement usability.
Solution Approach 2:
A regulation member is introduced as an intermediary component to control the movement of the cartridge during insertion. This mediator ensures that the cartridge moves only in the insertion direction and prevents perpendicular movements, thereby maintaining precise positioning between the LED array and photosensitive drum.
2Ease of operation
If the LED array is disposed at the top cover for intuitive cartridge replacement, then ease of operation is improved, but the risk of exposure surface damage increases
Solution Approach 1:
The LED array is extracted from the top cover area and relocated to the apparatus main body, removing the exposure surface from the user-accessible region. This eliminates the risk of users accidentally touching or damaging the LED exposure surface during cartridge replacement operations.
Solution Approach 2:
The regulation member acts as a physical barrier and guide, preventing the cartridge from moving perpendicular to the insertion direction. This intermediary structure ensures that the cartridge follows a precise insertion path, avoiding contact with the LED array and preventing exposure surface damage.
3Device complexity
If the LED array is disposed at the top cover to simplify structure, then device complexity is reduced, but the load on the user during cartridge replacement increases
Solution Approach 1:
The LED array is extracted from the top cover and repositioned in the apparatus main body, allowing the top cover to remain simple while the internal structure provides precise positioning guidance through the regulation member.
Solution Approach 2:
The regulation member serves as a mechanical guide that constrains cartridge movement to the insertion direction only. This intermediary structure reduces friction and resistance during insertion by providing smooth guidance surfaces, thereby reducing the force required by the user despite the added structural component.
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 configuration enables high precision printing while downsizing the apparatus and improving usability by preventing cartridge and LED unit damage during replacement, maintaining accurate positioning and reducing user load.
Implementation Method 1
configured to irradiate the photosensitive drum with light to form a latent image
Data Source
AI summary
An image forming apparatus is provided, in which a light emission unit is disposed upstream from a belt in the insertion direction. In a state where the insertion of a cartridge into the apparatus main body is completed, in the normal direction to the surface of the belt, a distance from the surface of the transfer member to the rotational shaft of a photosensitive drum is longer than a distance from the surface of the belt to an image forming position where light emitted by the light emission unit forms an image on the surface of the photosensitive drum.