Variable Thickness Mirror Resisting Vibration Bending
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Solution Overview
Problem
Conventional display devices with integral mirror units lack sufficient rigidity due to uniform thickness, leading to bending under vibrations, and increasing thickness to enhance rigidity results in increased weight.
Innovation Solution
A display device configuration featuring a mirror with a plate-shaped mirror body and supported portions, where the rigidity per unit width is greater near the supported portions, reducing the risk of bending and weight increase, achieved by varying the thickness and material distribution across the mirror body.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the thickness of the mirror unit is increased to enhance rigidity, then the rigidity is improved, but the weight increases
Solution Approach 1:
The mirror body is designed with non-uniform thickness distribution, where the first region (near the supported portion) has greater thickness than the second region. This local variation in geometry provides higher rigidity at the supported portion without increasing the overall weight of the mirror unit.
Solution Approach 2:
Instead of uniformly increasing thickness in one dimension, the invention varies the thickness across different regions of the mirror body, effectively using dimensional variation to optimize the rigidity-to-weight ratio.
2Ease of manufacture
If the thickness of the mirror unit is uniform, then the manufacturing is simplified, but the rigidity is insufficient under vibrations
Solution Approach 1:
The mirror body features a first region with greater thickness near the supported portion and a second region with smaller thickness at the outer edge. This local quality variation ensures sufficient rigidity at the supported portion to resist vibrations while maintaining manufacturing feasibility through a relatively simple two-region design.
3Weight of moving object
If the supported portion is not adequately reinforced, then the weight is reduced, but the mirror bends under vibrations
Solution Approach 1:
The first region of the mirror body, located near the supported portion, has greater thickness to provide enhanced rigidity and anti-bending stability at the critical supported area. This localized reinforcement prevents vibration-induced bending while minimizing overall weight increase.
Solution Approach 2:
The mirror body is pre-designed with a specific thickness distribution pattern during manufacturing, where the first region is intentionally made thicker than the second region. This preliminary structural preparation ensures that the mirror maintains its shape and stability under vibrations without requiring additional active control mechanisms.
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 configuration effectively enhances the rigidity of the mirror while minimizing weight, reducing the harmful effects of vibrations and maintaining a large reflecting surface area.
Implementation Method 1
The mirror is provided inside the housing, reflects the video projected from the video generator, and projects the reflected video to an outside of the housing
Data Source
AI summary
A display device has a housing, a video generator, and a mirror. The mirror has a mirror body and a supported portion. The mirror body has a plate shape. The supported portion is provided at at least one end portion in a first direction of the mirror body, and is supported by the housing to be rotatable around a rotating axis along the first direction. The mirror body has a first portion and a second portion. The first portion is located at a position overlapping the supported portion in a second direction crossing a thickness direction and the first direction of the mirror body. The second portion is located at a position different from the supported portion in the second direction. Rigidity per unit width of the first portion in the second direction is greater than rigidity per unit width of the second portion in the second direction.