MEMS Light Deflector Mount Structure for Large-Angle Stability
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Solution Overview
Problem
Existing MEMS light deflectors face issues with increased oscillation angles leading to collisions and instability in electrical connections due to close proximity to the circuit board, which can cause damage and reduce mechanical and electrical stability.
Innovation Solution
The light deflector incorporates a mount portion to increase the distance between the movable portion and the circuit board, uses anisotropic conductive resin film for stable electrical connections, and employs upper and lower restricting portions to limit deformation and movement, preventing collisions and enhancing impact resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the oscillation angle of the movable portion is increased, then the light deflection capability is improved, but the movable portion may collide with the circuit board causing damage and reducing reliability
Solution Approach 1:
The patent introduces a vertical dimension by adding a mount portion that elevates the movable portion away from the circuit board plane. This z-axis separation allows the movable portion to oscillate with larger angles in the horizontal plane without colliding with the circuit board, effectively resolving the contradiction between deflection capability and collision prevention.
Solution Approach 2:
The mount portion acts as an intermediary element between the circuit board and the movable portion. It provides mechanical support while maintaining a safe distance, enabling the movable portion to achieve larger oscillation angles without direct contact with the circuit board, thus preventing damage while improving light deflection capability.
2Volume of moving object
If the movable portion is positioned close to the circuit board, then the device size is reduced, but the electrical connection stability deteriorates due to vibrations and movements
Solution Approach 1:
The mount portion elevates the movable portion in the vertical dimension, separating it from the circuit board. This spatial separation in the z-axis direction stabilizes the electrical connection by reducing vibration-induced contact issues, while the overall device footprint remains compact in the x-y plane.
Solution Approach 2:
The device is segmented into distinct functional modules: the circuit board layer, the mount portion, and the movable portion. This segmentation allows each component to perform its function independently, with the mount portion specifically designed to provide stable electrical connections while enabling movement.
3Volume of moving object
If the movable portion is positioned close to the circuit board, then the device structure is compact, but mechanical stability is reduced due to vibrations and external impacts
Solution Approach 1:
By introducing vertical separation through the mount portion, the patent enhances mechanical stability without significantly increasing the device's horizontal footprint. The mount portion acts as a shock-absorbing element that protects the movable portion from vibrations and external impacts.
Solution Approach 2:
The mount portion serves as a pre-positioned cushioning element between the circuit board and the movable portion. It absorbs and dampens vibrations and external impacts before they can reach the sensitive movable portion, thereby protecting the device structure while maintaining compact dimensions.
4Reliability
If the distance between the movable portion and circuit board is increased, then collision prevention is improved, but the device volume increases
Solution Approach 1:
The patent increases the distance between the movable portion and circuit board in the vertical dimension rather than horizontally. This allows collision prevention to be achieved while maintaining a compact device footprint in the operational plane, as the separation is achieved through vertical stacking rather than lateral expansion.
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 prevents damage to the movable portion and improves mechanical and electrical stability, allowing for increased oscillation angles without compromising the integrity of the device.
Implementation Method 1
uses anisotropic conductive resin film for stable electrical connections
Implementation Method 2
a stopper having one end connected to the first connecting portion and the other end connected to the second connecting portion on the at least one supporting part to be contactable with and straddle the multiple drive beams
Data Source
AI summary
A light deflector includes a movable portion including a reflector; multiple drive beams supporting the movable portion to allow the movable portion to be oscillatable; at least one supporting part supporting the multiple drive beams, the at least one supporting part including a first connecting portion and a second connecting portion different from the first connecting portion; and a stopper having one end connected to the first connecting portion and the other end connected to the second connecting portion on the at least one supporting part to be contactable with and straddle the multiple drive beams.