Dust-proof Member Convex Concave Design for Optical Box Sealability
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Solution Overview
Problem
The existing light scanning apparatuses face issues with degradation in sealability due to deformation and fatigue of sealing members, leading to reduced dust-proof performance and potential image degradation in high-speed recording applications.
Innovation Solution
A light scanning apparatus with a dust-proof member featuring convex and concave portions on the cover and optical box interface, reducing the repulsion force and preventing deformation, thereby maintaining sealability and dust-proof performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a soft sealing member is sandwiched between the optical box and the upper cover to secure sealability, then the dust-proof performance is improved, but the sealing member undergoes fatigue degradation and the upper cover deforms due to repulsion force
Solution Approach 1:
The sealing member is divided into multiple pressing portions that press at different locations on the upper cover. This segmentation distributes the sealing force across multiple points, preventing localized deformation and reducing fatigue degradation of the sealing member while maintaining effective sealability.
Solution Approach 2:
Different portions of the sealing member are positioned to press at specific locations on the upper cover where reinforcement is needed. The pressing portions are strategically located to address local deformation tendencies, providing targeted support without requiring uniform reinforcement across the entire cover.
2Stability of the object's composition
If the upper cover and optical box are fastened with screws to prevent deformation, then the structural stability is improved, but the sealing member still undergoes fatigue degradation due to continuous pressing
Solution Approach 1:
The sealing function is segmented into multiple pressing portions that work together to maintain sealability. This allows the cover to be fastened with screws for structural stability while the distributed pressing portions continue to provide effective sealing without concentrating stress on a single point, thereby reducing fatigue degradation.
3Productivity
If the light scanning apparatus operates at high speed, then the productivity is improved, but the repulsion force on the sealing member increases causing faster fatigue degradation
Solution Approach 1:
The sealing member is divided into multiple pressing portions that distribute the repulsion force generated during high-speed operation. This segmentation prevents any single portion from bearing excessive stress, thereby reducing fatigue degradation and extending service life even when the apparatus operates at high recording speeds.
Solution Approach 2:
The pressing portions are strategically positioned to address local stress concentrations that occur during high-speed operation. This provides targeted reinforcement at critical locations without requiring a complete redesign of the sealing structure, enabling the system to maintain sealability under high-speed operating conditions.
Data Source
AI summary
Provided is a light scanning apparatus, including: a light source emitting a light beam; a rotary polygon mirror deflecting the light beam so as to scan a photosensitive member with the light beam; an optical member guiding the light beam; an optical box on which the light source is mounted and which contains the rotary polygon mirror and the optical member; a cover mounted on a side wall of the optical box so as to cover an opening of the optical box, and the cover having a dust-proof member which is molded on the cover and sandwiched between the cover and the side wall of the optical box; and the dust-proof member including convex portions protruded toward the optical box and configured to contact with a top of the side wall opposed to the dust-proof member, and a concave portion provided between the convex portions and separated from the top.