Optical Deflection Drive Support Recess Layout for Torsion Stress
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing drive elements using a tuning fork vibrator are prone to breakage due to stress concentration near the center of the support part's side surface when twisted, caused by the formation of large recesses during etching.
Innovation Solution
The drive element is designed with a support part featuring a first recess of smaller size at the center and a second recess of larger size elsewhere, formed through controlled etching to distribute stress concentration and enhance strength at the center.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the support part is formed by etching with uniform recesses, then manufacturing is simplified, but stress concentration causes breakage at the center
Solution Approach 1:
The patent applies local quality by making the recess size variable along the thickness direction of the support part. Specifically, the recesses in the first region (including the center) are made smaller than the recesses in the second region (other than the center). This local variation in recess quality optimizes stress distribution - smaller recesses at the stress-concentrated center reduce breakage risk, while larger recesses elsewhere maintain manufacturing efficiency.
2Productivity
If larger recesses are formed in the support part, then etching productivity is improved, but stress concentration increases leading to breakage
Solution Approach 1:
The patent implements local quality by differentiating recess dimensions based on location. The second region (non-center areas) has larger recesses that can be etched more quickly, improving productivity in those regions. The first region (center area) has smaller recesses that maintain structural strength and prevent breakage. This spatial differentiation of recess quality allows the system to achieve both high productivity and high strength.
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
This configuration effectively suppresses breakage of the support part due to stress concentration while maintaining productivity by optimizing the etching process to form smaller recesses only where stress is most concentrated.
Implementation Method 1
When torsion occurs in the support part due to a turn of the movable part, stress concentrates near the center of the side surface of the support part
Data Source
AI summary
In a drive element, suppressing breakage in a support part due to stress concentration caused by torsion of the support part. The drive element includes a movable part allowed to be turned about a turn axis, a fixture, support part extending along the turn axis and connecting the movable part and the fixture, and a drive part that turns the movable part about the turn axis. A plurality of recesses extending in a direction away from the movable part is formed in side surface of the support part side by side in a thickness direction of the support part. The recess formed in a first region including at least the center in a thickness direction of the side surface of the support part has a smaller size than the recess formed in a second region other than the first region on the side surface of the support part.