Exposure Unit Positioning via Protrusion and Biasing
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Solution Overview
Problem
Conventional image forming devices face challenges in achieving precise positioning between the exposure unit and the photosensitive body due to looseness between the pin and hole, which degrades the relative positioning and affects imaging quality.
Innovation Solution
An image forming device is designed with a positioning protrusion and a biasing unit, where the exposure unit has light emitting sections arrayed in a longitudinal direction, and a positioning part engages with the protrusion, utilizing leaf springs to provide a biasing force that ensures accurate engagement and positioning between the exposure unit and the photosensitive body.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a pin and hole structure is used to support the exposure unit, then the exposure unit can be movable between close and remote positions, but looseness between the pin and hole degrades relative positioning accuracy
Solution Approach 1:
A positioning protrusion and positioning part are introduced as intermediary elements between the exposure unit and the frame. The positioning protrusion extends from the exposure unit in the optical axis direction, and the positioning part is formed on the frame to engage with it, providing precise positioning through a dedicated positioning mechanism rather than relying on the general pin-hole support structure.
Solution Approach 2:
The conventional pin-hole mechanical support system is supplemented by a positioning protrusion-positioning part engagement system. The biasing unit (such as a spring) provides a biasing force to maintain constant engagement between the positioning protrusion and positioning part, ensuring both movability and positioning accuracy through a more sophisticated mechanical interaction.
2Ease of operation
If looseness is introduced between pin and hole to enable movement, then the exposure unit can be exchanged easily, but positioning precision is degraded
Solution Approach 1:
The support and positioning functions are segmented into separate mechanisms. The pin-hole structure provides general support and allows movement, while the positioning protrusion-positioning part system provides precise positioning. This segmentation allows each mechanism to optimize for its specific function without compromising the other.
Solution Approach 2:
The positioning system uses a biasing force parameter to maintain optimal engagement between the positioning protrusion and positioning part. By controlling the biasing force magnitude, the system ensures sufficient contact for positioning precision while allowing enough freedom for easy exchange of components.
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 ensures precise and accurate positioning of the exposure unit relative to the photosensitive body, enhancing imaging quality by maintaining the relative position between the LED head and the photosensitive drum, even during the movement between proximity and remote positions.
Implementation Method 1
The biasing unit provides a biasing force that ensures engagement between the positioning protrusion and the positioning part
Data Source
AI summary
An image forming device capable of providing precise positional relationship between an exposure unit and a photosensitive body. The exposure unit having an exposure head elongated in a longitudinal direction and having light emitting sections arrayed in the longitudinal direction. The light elements emit light in an optical axis direction. A frame supports the photosensitive body. A positioning protrusion protrudes in the optical axis direction from one of the frame and the exposure unit. A remaining one of the frame and the exposure unit is formed with a positioning part engageable with the positioning protrusion. A biasing unit provides a biasing force that ensures engagement between the positioning protrusion and the positioning part.