Polygon Mirror Resin Projections Vibration Control
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Solution Overview
Problem
Polygon mirrors in optical scanning devices face deformation and vibration due to excessive forces during rotation, leading to deterioration in optical characteristics, which existing technologies have not adequately addressed.
Innovation Solution
A polygon mirror design featuring a resin member with projections and depressed portions that distribute forces and reduce vibration, where the projections on the top surface form the inner surface and the depressed portions on the bottom surface are positioned to disperse forces, enhancing the mirror's strength and reducing weight.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If heat releasing projections are provided to upper and lower portions of the polygon mirror, then heat dissipation is improved, but excessive forces act on the projections during rotation causing deformation or vibration
Solution Approach 1:
The polygon mirror is divided into multiple resins (first resin, second resin, third resin) with different functions. The first resin forms the reflective surface, the second resin provides heat dissipation structures, and the third resin offers mechanical support. This segmentation allows each component to optimize its function without compromising the others.
Solution Approach 2:
Different regions of the polygon mirror are assigned different materials with specific properties. The first resin is positioned where optical precision is critical, the second resin is placed in areas requiring heat dissipation, and the third resin is used where structural strength is needed. This local differentiation resolves the contradiction between heat dissipation and mechanical stability.
2Strength
If the polygon mirror structure is reinforced to prevent deformation, then optical characteristics are maintained, but weight increases leading to higher centrifugal forces during rotation
Solution Approach 1:
The polygon mirror uses a composite structure of multiple resins with different properties. The first resin provides optical precision, the second resin contributes to heat dissipation and structural integrity, and the third resin adds mechanical strength. This composite approach achieves high strength-to-weight ratio, preventing deformation without excessive weight increase.
Solution Approach 2:
The mirror is segmented into functional regions with different materials, allowing each segment to contribute specifically to strength while minimizing overall weight. The lightweight resins are positioned strategically to provide maximum structural benefit with minimum mass.
3Strength
If projections are made closer to outer surfaces to improve structural strength, then resistance to rotation forces increases, but vibration is exacerbated
Solution Approach 1:
The third resin is positioned specifically at the inner surface to provide mechanical support and dampen vibration, while the second resin with heat releasing projections is positioned at outer surfaces for heat dissipation. This localized functional assignment allows strength and vibration control to be optimized independently without conflict.
Solution Approach 2:
The third resin acts as an intermediary layer between the reflective first resin and the heat-dissipating second resin, providing mechanical support and vibration damping. This intermediary structure resolves the contradiction by decoupling the strength-providing function from the vibration-prone outer structures.
Data Source
AI summary
A polygon mirror includes a resin member, a first surface, a second surface facing the first surface, an inner surface joining the first and second surfaces to surround a through hole extending from the first to the second surface, and includes outer surfaces joining the first and second surfaces. A first segment between the first surface and the outer surfaces is defined as a first reference of a height in a direction from a second segment between the second surface and the outer surfaces to the first segment. The first surface includes a projection that forms the inner surface and projects from the first reference toward a side opposite to the second surface. The second segment is defined as a second reference of the height in the direction. The second surface includes a depressed portion distant from the outer surfaces and depressed from the second reference toward the first surface.