Resin Rotary Polygon Mirror Balance Correction Design
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Solution Overview
Problem
Resin rotary polygon mirrors in laser light deflecting systems face challenges in maintaining flatness of the reflecting surface due to stress from adhesive hardening, leading to potential deformation during high-speed rotation.
Innovation Solution
A resin rotary polygon mirror design with a protruding portion and a step portion adjacent to the rotation center, where the adhesive for balance correction is applied, minimizing stress impact on the reflecting surface and enhancing adhesive strength, while maintaining a recess-free thickness region to reduce deformation and improve surface accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If adhesive is applied to balance correction on the rotary polygon mirror, then balance correction is achieved, but stress during hardening causes decrease in flatness of the reflecting surface
Solution Approach 1:
The patent applies adhesive only to specific local regions (first and second regions) rather than the entire surface, concentrating the balance correction function in areas that minimize impact on the reflecting surface flatness
Solution Approach 2:
The balance correction is divided into multiple segments (first adhesive region and second adhesive region) positioned at different locations, allowing independent optimization of each region's function while minimizing overall impact on surface flatness
2Ease of operation
If adhesive is applied to correct unbalance, then rotation smoothness is improved, but stress generated during hardening causes deformation of the reflecting surface
Solution Approach 1:
Adhesive is applied locally to the first and second regions which are positioned to provide balance correction while minimizing stress transmission to the reflecting surface, maintaining both rotation smoothness and surface shape integrity
3Weight of moving object
If the rotary polygon mirror is made of resin, then weight reduction is achieved, but the reflecting surface becomes more sensitive to stress during adhesive hardening
Solution Approach 1:
The resin rotary polygon mirror applies adhesive only to specific local regions rather than the entire surface, reducing the total stress imposed on the lightweight resin structure and preventing deformation of the reflecting surface while maintaining weight reduction benefits
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
The solution effectively reduces or eliminates deformation of the reflecting surface, maintains high adhesive strength, and ensures reliable light deflection with improved surface accuracy and reduced wind noise during high-speed rotation.
Implementation Method 1
a weight for balance correction is applied to a portion of the protruding portion adjacent to a rotation center of the rotary polygon mirror
Implementation Method 2
a plurality of reflecting surfaces configured to reflect the laser light
Data Source
AI summary
A rotary polygon mirror has no recess in a thickness region of one of the reflecting surfaces of the rotary polygon mirror in the direction of the rotation axis of the rotary polygon mirror and has a protruding portion protruding from the thickness region in a direction away from the thickness region.