Mirror Device Rib Protrusion for Distortion Control
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Solution Overview
Problem
Existing mirror devices face challenges in effectively suppressing distortion of the mirror surface and facilitating manufacturing, particularly due to manufacturing errors that can lead to inconsistent rib formation on the mirror's surface.
Innovation Solution
The mirror device incorporates a rib portion with an extending portion that protrudes outward from the outer edge of the body portion, increasing the rigidity at the edges where distortion is likely to occur, while its design avoids manufacturing errors by ensuring the rib is formed consistently, allowing for better control over manufacturing conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the rib portion is formed close to the outer edge of the body portion to suppress distortion, then the rigidity at the outer edge is increased, but manufacturing errors may cause inconsistent rib formation
Solution Approach 1:
The extending portion is designed to protrude outward from the outer edge of the body portion, adding a dimensional element that extends beyond the original boundary. This protrusion structure allows the rib portion to effectively reinforce the outer edge while providing a clear geometric reference that is less susceptible to manufacturing variations, thereby resolving the contradiction between achieving high rigidity and maintaining manufacturing consistency
2Ease of manufacture
If the side surface of the extending portion is made flush with the side surface of the body portion, then manufacturing simplicity is improved, but distortion suppression effectiveness is reduced
Solution Approach 1:
The extending portion protrudes outward from the body portion's outer edge, creating a three-dimensional structure that extends beyond the original surface. This dimensional extension allows the rib portion to provide effective distortion suppression at the critical outer edge region while maintaining a clear distinction from the body portion surface, thereby achieving both structural effectiveness and manufacturing clarity
3Strength
If the protrusion portion extends significantly outward from the outer edge, then distortion suppression is enhanced, but the device size increases
Solution Approach 1:
The protrusion portion extends outward from the outer edge by a controlled amount that is sufficient to achieve the desired distortion suppression effect, but not excessively so. This partial extension provides the necessary structural reinforcement at the critical outer edge region while minimizing the overall size increase of the device, balancing performance requirements with compact dimensions
Data Source
AI summary
A mirror device includes a support portion; a first movable portion including a body portion including a first surface and a second surface opposite to the first surface, a mirror surface being formed on the first surface and a rib portion being formed on the second surface; and a first torsion bar that couples the first movable portion to the support portion such that the first movable portion is swingable around an X-axis. The rib portion includes a first extending portion extending along an outer edge of the body portion when viewed in a direction perpendicular to the second surface. The first extending portion includes a protrusion portion protruding outward from the outer edge of the body portion and extending along the outer edge of the body portion when viewed in the direction perpendicular to the second surface.