Optical Scanning Device Stress Alleviation Area
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Solution Overview
Problem
Conventional optical scanning devices face issues with stress concentration and material fatigue near rib structures, leading to potential destruction and performance degradation due to deformation compensation.
Innovation Solution
An optical scanning device with a mirror part supported by a pair of torsion bars, featuring stress alleviation areas with slits between the mirror reflecting surface and the torsion bars to distribute stress, reducing the impact on the mirror reflecting surface and rib structures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If ribs are formed on the back surface near the connection part between the movable plate and torsion beam to reduce deformation of the reflecting surface, then the deformation of the reflecting surface is compensated, but stress is concentrated in the vicinity of the rib structure causing destruction and material fatigue
Solution Approach 1:
A stress alleviation area is introduced as an intermediary region between the rib structure and the torsion bar connection part. This stress alleviation area, which may include features such as rounded corners, reduced material density, or geometric transitions, acts as a mediator to distribute stress more evenly, preventing stress concentration at the rib structure while maintaining the reflecting surface's stability.
Solution Approach 2:
The patent applies different structural qualities to different regions: the rib structure maintains its stiffening function in areas where it is needed for reflecting surface stability, while the stress alleviation area introduces localized geometric modifications (such as rounded corners or reduced thickness) specifically at the connection part to reduce stress concentration. This localized quality change allows simultaneous achievement of both stability and stress reduction.
2Stability of the object's composition
If ribs are formed on the back surface near the connection part between the movable plate and torsion beam, then the reflecting surface deformation is reduced, but material fatigue occurs causing performance degradation
Solution Approach 1:
The stress alleviation area serves as an intermediary that protects the rib structure from direct stress transmission during torsional motion. By introducing this intermediate region with modified geometry (such as rounded corners or reduced material density), the patent prevents harmful stress cycles from reaching the rib structure, thereby reducing material fatigue while preserving the reflecting surface's stability.
3Speed
If the mirror part is supported by torsion bars for torsional motion, then light deflection is achieved, but stress is generated during torsional motion that concentrates on the mirror part
Solution Approach 1:
The patent modifies the local quality of the mirror part at the connection region by introducing a stress alleviation area with different geometric properties (such as rounded corners, reduced thickness, or material density changes). This localized modification allows the mirror part to maintain its torsional functionality for light deflection while reducing stress concentration at the critical connection part between the mirror part and torsion bar.
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 alleviates stress on the mirror part, preventing destruction and material fatigue, thereby enhancing the device's performance and service life by distributing torsional stresses and reducing concentration on critical areas.
Implementation Method 1
a pair of torsion bars configured to support the mirror part from both sides and configured to form a first axis around which to swing the mirror part by a torsional motion thereof so as to deflect the reflected light
Implementation Method 2
at least one stress alleviation area configured to alleviate a stress generated by the torsional motion of the torsion bars
Implementation Method 3
a mirror part including a mirror reflecting surface to reflect incident light
Data Source
AI summary
An optical scanning device includes a mirror part including a mirror reflecting surface to reflect incident light, a pair of torsion bars configured to support the mirror part from both sides and configured to form a first axis around which to swing the mirror part by a torsional motion thereof so as to deflect the reflected light, and at least one stress alleviation area configured to alleviate a stress generated by the torsional motion of the torsion bars. The alleviation area is provided between an intersection of a second axis perpendicular to the first axis and passing through the center of the mirror reflecting surface and an edge of the mirror reflecting surface, and at least one of the torsion bars.