Optical Scanner Damper for Vibration Isolation
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Solution Overview
Problem
Miniaturized optical scanners face challenges in maintaining vibration performance due to decreased inertia moment of the displacement portion, leading to unwanted oscillation components from high-frequency vibrations affecting vertical scanning during horizontal scanning.
Innovation Solution
The optical scanner design includes a movable plate supported by first and second torsion bars, with a damper portion of smaller thickness extending in a direction intersecting the second torsion bar, and varying lengths and thicknesses of the displacement portion to enhance inertia moment and resistance, reducing reaction to high-frequency driving signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the displacement portion is miniaturized, then the inertia moment of the displacement portion decreases, but the displacement portion becomes easily affected by high-frequency vibration
Solution Approach 1:
The displacement portion is designed with non-uniform thickness, being thicker at the ends and thinner in the middle section. This local variation in thickness creates different inertial properties at different locations, allowing the ends to have higher inertia that resists high-frequency vibration while maintaining overall miniaturization. The thicker end regions act as inertial anchors that reduce the impact of high-frequency driving signals on the vertical scanning motion.
2Volume of moving object
If the displacement portion is miniaturized, then the device size is reduced, but horizontal scanning driving signal affects vertical scanning
Solution Approach 1:
By making the displacement portion thicker at the ends and thinner in the middle, the design creates localized inertial zones at the ends that are more resistant to high-frequency acceleration. This non-uniform mass distribution reduces the transmission of horizontal scanning vibrations to the vertical scanning axis, eliminating unwanted oscillation components while keeping the overall device compact.
3Reliability
If the thickness of the displacement portion is increased, then the inertia moment increases and vibration resistance improves, but the device size increases
Solution Approach 1:
Instead of uniformly increasing the thickness of the displacement portion, the design applies increased thickness only at the end regions where inertial resistance is most needed for vibration suppression. The middle section remains thinner to maintain overall compactness. This selective thickening achieves the desired vibration resistance without proportionally increasing the total device volume.
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 improves vibration performance by minimizing the impact of high-frequency driving on vertical scanning, ensuring that horizontal scanning does not significantly affect vertical scanning, thus enhancing the optical scanner's overall performance.
Implementation Method 1
a first torsion bar which oscillatably supports the movable plate around a first axis
Implementation Method 2
a second torsion bar which oscillatably supports the first displacement portion around a second axis intersecting with the first axis
Implementation Method 3
When the first displacement portion oscillates around the second axis, an air current is generated around the damper portion. Accordingly, it is possible to set the first displacement portion to hardly react with respect to the driving with the high frequency
Data Source
AI summary
An optical scanner includes: a movable plate which includes a light reflection unit; a first torsion bar which oscillatably supports the movable plate around a first axis; a first displacement member which is connected to the first torsion bar; a second torsion bar which oscillatably supports the first displacement member around a second axis; a second displacement member which is connected to the second torsion bar; and an actuator which is installed on the second displacement member and applies a displacement to the second displacement member so as to apply torsional deformation and bending deformation to the second torsion bar, in which the first displacement member includes a frame member surrounding the movable plate, and a damper which has a smaller thickness than that of the frame member and extends in a direction intersecting with a direction in which the second torsion bar extends from the frame member.